An Affordable System Solution for Enhancing Tree Survival in Dry Environments
Abstract
:1. Introduction
1.1. Problem
1.2. Can Increasing Afforestation Be a Potential Solution to Global Water Scarcity?
- Trees improve water retention by acting as natural reservoirs, minimizing water scarcity. Trees absorb rain through transpiration and interception, slowing surface runoff and evaporation. Researchers found plants absorb 70–80% of precipitation [5]. Trees store and slowly release groundwater and streamflow into the soil. This process helps conserve water and ensures a steady supply, especially during droughts.
- Microclimate Effect: Trees preserve water by shading and releasing water vapor. This microclimate modulation cools and humidifies, reducing temperature extremes and soil water evaporation. Nearby areas have reduced water stress, enhanced vegetation, and reduced drought risk [12].
- Carbon Sequestration: Trees mitigate climate change by absorbing carbon dioxide and reducing greenhouse gas emissions. Afforestation enhances ecosystems and water availability. Despite its benefits, afforestation has drawbacks. High evapotranspiration from fast-growing, non-native trees may restrict water availability.
1.3. Global Water Scarcity Problem
1.3.1. Water Stress
- Evaporation: Process: Solar radiation overcomes intermolecular interactions and turns water into gas. The “Clausius–Clapeyron equation” [33] links temperature and vapor pressure. At the liquid–air barrier, evaporation occurs. Seas, lakes, rivers, damp soil, and plant transpiration all contribute to evaporation. Timing: Temperature, humidity, wind speed, and water body surface area affect evaporation [34,35].
- Condensation: After releasing thermal energy, water vapor condenses around condensation nuclei in a cooler, higher atmosphere. Water vapor molecules create droplets or ice crystals on dust, salt, or air pollutants [36]. Higher tropospheric temperatures are lower than surface temperatures; hence, condensation occurs. Air pressure and temperature affect height. Condensation time varies depending on temperature, relative humidity, and condensation nuclei [37,38].
- Precipitation: Water vapor condenses into heavy droplets or ice crystals, preventing their persistence in the atmosphere. They then become rain, snow, sleet, or hail. Different air temperatures and pressures cause different precipitations. Regional climate patterns and wind directions affect rainfall distribution and intensity [37,39].
- Interception: Leaves and branches intercept rainwater, causing evaporation or drips. This process is common in forest and grassland areas with abundant flora [40].
- Runoff: Procedure surface or subsurface runoff occurs when saturation, impermeable surfaces, or steep slopes prevent precipitation from penetrating. Rivers, streams, and the ocean receive surface runoff. Landscape features locate runoff. Impervious surfaces, such as steep slopes or cities, generate the most surface runoff. Subsurface runoff can be experienced by anyone with permeable soils and unsaturated subsurface layers [44,45].
- Storage: Reservoirs store water at various stages of the water cycle. The most water is in oceans, followed by lakes, glaciers, snowfields, and aquifers. Water in reservoirs can last for days in plants or centuries in oceans [43]. Storage reservoirs are separated by geography. The NOAA reported in 2023 that 71% of Earth is ocean [46].
1.3.2. Water Scarcity and Access
1.3.3. Inefficient Irrigation
1.3.4. Moving Forward
1.3.5. Effects
1.3.6. Consequences
- Reduced Food Production: Water scarcity and inefficient irrigation practices significantly impact agricultural productivity, leading to food insecurity and potential social unrest in vulnerable regions [51].
- Environmental Degradation: Water scarcity, salinization, and soil degradation can have detrimental effects on the environment, leading to desertification, biodiversity loss, and disruption of natural ecosystems [52].
- Socio-economic Challenges: Water scarcity and its associated limitations on agricultural production can exacerbate poverty, hinder economic development, and lead to migration from rural areas to urban centers in search of alternative livelihoods [54].
2. Biomimetic Systems
2.1. Biomimetics and Water (Hydrophobicity)
2.2. Biomimetic Water Collection: “Lotus Effect” (Lotus Leaf/Nelumbo Nucifera)
2.3. Biomimetic Water Collection: The Inspiration of “Banana Leaves” (Musa acuminata)
- Hierarchical Surface Structures: Banana leaves exhibit micro- and nanoscale hierarchical structures, including ridges, grooves, and wax crystals. These structures minimize the contact area between water droplets and the leaf surface, promoting water repellency and easy shedding.
- Hydrophobicity: The presence of hydrophobic compounds, such as waxes and oils, on the surface of banana leaves enhances their water-repellent properties. This hydrophobicity prevents water adhesion and facilitates the runoff of water droplets.
- Sustainable Water Harvesting: Banana leaf-inspired surfaces, with their hierarchical micro- and nanostructures coupled with hydrophobic properties, offer significant potential for enhancing water harvesting technologies. These biomimetic designs can improve the efficiency of rainwater capture and fog harvesting systems, especially in arid and semi-arid regions where water scarcity is a prevalent issue. The self-cleaning properties inherent in banana leaf structures also ensure long-term operational efficiency by preventing the accumulation of dust and debris [68].
- Agricultural Applications: In agriculture, the application of banana leaf biomimetics can revolutionize irrigation methods by developing materials that deliver water directly to plant roots with minimal evaporation losses. This approach could significantly reduce water usage in irrigation, addressing the critical need for water conservation in agricultural practices [70]. Furthermore, the self-cleaning feature of biomimetic materials can reduce the maintenance requirements of agricultural equipment and structures.
- Environmental Engineering and Green Architecture: Biomimetic designs inspired by banana leaves are poised to make substantial contributions to green architecture and environmental engineering. For example, building surfaces mimicking the water-repellent and self-cleaning characteristics of banana leaves can lead to the development of structures that require less maintenance and are more resistant to weathering. Additionally, such surfaces can enhance rainwater harvesting systems integrated into building designs, contributing to sustainable water management practices [66].
- Advanced Coatings and Materials Science: The exploration of banana leaf biomimetics extends into the development of advanced coatings and materials science. By replicating the micro- and nanostructures found on banana leaves, scientists can create surfaces with unique properties, such as extreme water repellency, self-cleaning capabilities, and enhanced light reflection or absorption. These materials have broad applications, ranging from waterproof clothing and anti-fouling surfaces to solar panels with increased efficiency [67].
2.4. Biomimetic Solutions for Future Possibilities
3. Materials and Methods
3.1. Target of this Study
3.2. Methodology
- Theoretical Calculations Based on Design Parameters (Data Sheet 1/Table 5): Using theoretical information from global data systems, this research method entails calculating the soil’s ETo value using target field data and the Penman–Monteith equation. The objective is to establish a fundamental understanding of the system’s expected performance and identify potential areas for optimization during the project’s development phase, focusing particularly on Data Sheet 1. The goal is to assess the level and sustainability of water loss in the target soil area to ensure efficient operation of the AquaTrap system. Based on these data, this study aims to develop a method for calculating the minimum membrane area required to support each young sapling’s survival.
- Real-Time Calculations Based on Real Raw Data (Data Sheet 2/Table 6): In this stage, actual field measurements are collected to make more realistic evaluations. These calculations provide a more accurate assessment of the system’s performance by considering the influence of real operating conditions and environmental factors. This phase will validate the global system data in the field and determine whether sufficient water is available throughout the year.
- By determining water loss values, this study examines the accurate calculation of the tension membrane area required to collect sufficient water for the survival of plant species in the target region. This study also delves into the fundamental framework of a support system that aims to gather the desired daily net water volume of 1.5 L [2,3,6].
- Data Collection: Relevant system design parameters and specifications were collected from engineering drawings, technical documents, and expert opinions.
- Theoretical Modeling: Established theoretical models and equations were used to perform calculations based on the collected design parameters. These models consider the physical principles and operating characteristics of the system.
- Performance Estimation: To further develop the product, we used the results of theoretical calculations to estimate the system’s expected performance metrics, such as efficiency, output, and resource consumption.
4. AquaTrap
4.1. A Biomimetic Solution for the Efficient Irrigation of Newly Planted Trees
- Enhanced Water Collection: AquaTrap’s banana leaf-inspired membrane effectively captures and channels rainwater, maximizing water harvesting even during minimal rainfall events.
- Reduced Evaporation: The membrane’s lotus-effect surface minimizes evaporation, ensuring that collected water remains available for plant use.
- Efficient Drip Irrigation: The integrated drip irrigation system delivers water directly to the root zone, preventing waste and optimizing water utilization.
- Promotes Tree Adaptation: By providing a consistent and readily available water source, AquaTrap facilitates rapid tree adaptation and establishment, reducing stress and mortality rates.
- AquaTrap’s biomimetic design promotes sustainable water management practices, conserving precious water resources and minimizing environmental impact.
- AquaTrap stands as a testament to the power of biomimicry in addressing real-world challenges. By harnessing nature’s ingenious designs, AquaTrap revolutionizes irrigation practices, ensuring efficient water use, promoting tree health, and contributing to a more sustainable future for agriculture.
4.2. Concept
4.3. The Idea/System Proposal
4.4. System Parts/Assembly
4.5. Potential Advantages of the AquaTrap System
- Water Usage Efficiency: The AquaTrap system revolutionizes traditional irrigation practices by reducing water requirements by approximately one-sixth, a feature especially critical in arid regions where water resources are precious and scarce.
- Evaporation Capture and Redirection: It ingeniously captures water that would otherwise evaporate and redirects it toward the root zones of plants, maintaining optimal moisture levels. During peak hot seasons, the system can collect and redistribute water in the range of 200–450 cc/m2 daily, thus ensuring efficient water use.
- Design Simplicity and Reusability: Characterized by its simple assembly and disassembly, the AquaTrap system offers cost-effectiveness and suitability for repeated use across diverse planting sites. This design simplicity underlines the system’s adaptability and ease of handling, promoting its application in various agricultural contexts.
- Root Zone Moisture Enhancement: By significantly improving moisture levels within the root zone, the system facilitates enhanced root development and plant growth, crucial for the successful establishment of saplings.
- Organizational Efficiency: The grid system inherent in the AquaTrap design aids in the systematic planting of trees, ensuring effective spacing and promoting uniform growth among young trees.
- Cost-Effectiveness and Storage: The affordability and compact nature of the system enhance its storability and accessibility, making it an ideal choice for both small-scale gardeners and large-scale agricultural operations.
- Integration with Sprinkler Systems and Rainwater Collection: AquaTrap’s compatibility with existing surface sprinkler systems, coupled with its efficiency in maximizing rainwater collection, exemplifies its versatility and commitment to maximizing water usage efficiency.
- Drought Resilience: In areas experiencing limited rainfall, the system proves its worth by collecting sufficient water to sustain young trees, highlighting its adaptability to varying climatic conditions and its role in mitigating drought impact.
- Minimized Water Loss: The membrane structure central to the AquaTrap’s design effectively minimizes water loss through evaporation, ensuring a continuous supply of water directly to the roots where it is most needed, thereby enhancing plant resilience.
- Versatile Installation: Offering flexible installation options across different surfaces, the system caters to a wide array of flat and angular terrains and planting environments, underscoring its broad applicability.
- Sustainable Water Management: The AquaTrap system adopts an eco-conscious approach by efficiently reclaiming lost moisture, contributing significantly to sustainable water management practices and environmental stewardship.
- Environmental Preservation: Through the utilization of recycled plastics in its construction, the system not only supports environmental preservation efforts, but also contributes to waste reduction, aligning with global sustainability goals.
- Wide Accessibility: The availability of the AquaTrap system in retail outlets, including supermarkets, at an affordable cost, ensures its accessibility to a broad spectrum of users, from individual gardeners to large-scale agricultural producers, encouraging its widespread adoption and use.
- Weed Suppression: The use of colored nylon not only aids in moisture retention, but also inhibits the growth of unwanted weeds under the canopy of trees. This dual function enhances the system’s efficiency by conserving water and reducing the labor and resources needed for weed control.
- Modular Composition: The AquaTrap system is comprised of easily interchangeable parts, facilitating quick assembly, disassembly, and modifications as needed. This modularity ensures that the system can be tailored to specific requirements, enhancing its utility across various settings.
- Scalability: Its design permits scaling from as small as 1 m2 (1 × 1 m) to as large as 64 m2 (8 × 8 m), offering unparalleled flexibility to accommodate different land sizes and water needs. This scalability makes the AquaTrap suitable for a wide range of applications, from small garden plots to larger agricultural fields.
- Reusability: The AquaTrap’s components are designed for repeated use, significantly reducing the need for continuous investment in new irrigation infrastructure. This reusability not only lowers costs, but also decreases environmental waste, aligning with sustainable agriculture practices.
- Sustainability: Utilizing recycled plastics in the construction of AquaTrap components underscores the system’s commitment to environmental preservation. By repurposing waste materials, AquaTrap contributes to the circular economy and minimizes its ecological footprint.
- Ease of Packaging, Storage, and Transport: The compact and lightweight design of the AquaTrap system ensures ease of packaging, storage, and transportation, addressing logistical challenges and reducing carbon emissions associated with shipping.
5. Results and Discussions
5.1. Real-Time AquaTrap Application: “Evapotranspiration Monitoring for Pomegranate Tree Irrigation” in Akseki, Antalya
5.1.1. Evapotranspiration Monitoring
- Net radiation (Rn):
- Average daily solar radiation (Rs): For May in Akseki, Antalya, we estimated an average daily solar radiation (Rs) value of around 5.5 kWh/m2 day. This can be based on the historical solar radiation data for the region or by using solar radiation estimation tools.
- Net radiation (Rn): Assuming a typical albedo (reflectivity) of 0.2 for vegetation, which also estimate the net radiation (Rn) using the following formula:Rn = (1 − albedo) * RsRn = (1 − 0.2) * 5.5 kWh/m2 dayRn = 4.4 kWh/m2 day
- Soil heat flux (G): For daily time scales, soil heat flux (G) is typically negligible compared to net radiation (Rn). Therefore, it can assume:G = 0 MJ/m2 day
- Atmospheric pressure (P): The average atmospheric pressure at sea level is around 1013 hPa. For Akseki, Antalya, which is located at an altitude of approximately 1000–1050 m above sea level, you can estimate an average atmospheric pressure (P) of around 870 hPa.
- Mean air temperature (T): May is typically a warm month in Akseki, Antalya, with average mean air temperatures (T) ranging from 15 °C to 20 °C. The average temperature is 17.5 °C (24 h temperature average).
- Average relative fumidity (RH): Relative humidity (RH) can vary depending on the specific location and time of day. For Akseki, Antalya, in May, you can estimate an average RH of around 60% (RH also changes in the range of 35–75% in May).
- λE: Latent heat flux (rate of evapotranspiration);
- Rn: Net radiation (incoming solar radiation − outgoing terrestrial radiation) = 4.4 kWh/m2 day;
- G: Soil heat flux = 0 MJ/m2 day;
- s: Slope of the saturation–vapor pressure curve;
- e: Actual vapor pressure;
- es: Saturation vapor pressure;
- γ: Psychrometric constant.
- f.
- Important Considerations:
- These are just average values, and the actual meteorological data and ET values may vary depending on the specific conditions in Akseki, Antalya, in May (May is the highest evaporation period of the year in Antalya).
- The Penman–Monteith equation is a complex and data-intensive method. For more accurate ETo estimations, each application would need to have access to real-time meteorological data from a local weather station or use a specialized ETo estimation model in the target region.
- Pre-cooked ETo values are always estimated, but actual ETo may vary due to several factors like soil type, plant cover, and management practices.
- Continuous monitoring of soil moisture and adjustments to irrigation schedules are crucial for efficient water management systems like AquaTrap. The actual meteorological conditions and ETo values may differ from these estimates. For more precise information, we need to rely on real-time weather data and specialized ET estimation tools.
5.1.2. Calculations
- Data:Net radiation (Rn): 4.4 kWh/m2 day (converted from estimated daily solar radiation).Soil heat flux (G): 0 MJ/m2 day (negligible for daily time scales).Atmospheric pressure (P): 870 hPa (adjusted for Akseki’s altitude).Mean air temperature (T): 17.5 °C (average for May).Relative humidity (RH): 60% (average for May).
- Calculation Steps:
- Slope of saturation–vapor pressure curve (s):s = 6.65 * 10−5 * P * T/(1000 + T)
s = 6.65 * 10−5 * 870 hPa * 17.5 °C/(1000 + 17.5 °C)
s = 0.0023 kPa m−1 °C−1 (approximately) - Actual vapor pressure (e):e = (RH/100) * es
- (a)
- Saturation vapor pressure (es):es = 0.6108 * exp (17.23 * T/(237.3 + T))
es = 0.6108 * exp (17.23 * 17.5 °C/(237.3 + 17.5 °C))
es = 2.06 kPa (approximately) - (b)
- Actual vapor pressure (e):e = (60/100) * 2.06 kPa
e = 1.24 kPa (approximately)
- Psychrometric constant (γ):γ = (0.622 * P)/(P − es)
γ = (0.622 * 870 hPa)/(870 hPa − 1.24 kPa)
γ = 0.65 kPa °C−1 (approximately) - Latent heat flux (λE):Here is where the iterative process might be needed: We are aiming for an ETo value (λE) close to 144 mm/day. Using the estimated values above, we can calculate an initial λE:λE = (Rn − G) + s (e − es)/(1 + s/γ)
λE = (4.4 kWh/m2 day * (2.778 MJ/kWh) * (106 J/MJ)) + (0.0023 kPa m−1 °C−1 * (1.24 kPa − 2.06 kPa))/(1 + 0.0023 kPa m−1 °C−1/0.65 kPa °C−1)
λE ≈ 9.2 MJ/m2 day (approximately) - Converting MJ/m2 day to mm/day:ET (mm/day) = λE * (24 h/day) * (103 J/MJ) * (1 m2/106 mm2)
ET (mm/day) ≈ 9.2 MJ/m2 day * 24 h/day * 103 J/MJ * 1 m2/106 mm2
ET (mm/day) ≈ 221 mm/day (approximately)This initial theoretical calculation resulted in an ET value (221 mm/day/m2) much higher than the target ETo of 150 mm/day m2.Since the calculated ET is higher than the target ETo, let us try lowering the estimated relative humidity (RH) slightly, as lower humidity typically leads to a higher ET (RH in the range of 40–60% in May). - Recalculations with a low RH: The recalculation with an adjusted relative humidity (RH) of 55% is presented below:
- (a)
- Actual vapor pressure (e):e = (RH/100) * es (We already have es from previous calculation: 2.06 kPa)
e = (55/100) * 2.06 kPa
e = 1.13 kPa (approximately) - (b)
- Psychrometric constant (γ):γ = (0.622 * P)/(P − es)
γ = (0.622 * 870 hPa)/(870 hPa − 1.13 kPa)
γ = 0.65 kPa °C−1 (Remains the same as previous calculation) - (c)
- Latent heat flux (λE):λE = (Rn − G) + s (e − es)/(1 + s/γ)
λE = (4.4 kWh/m2 day * (2.778 MJ/kWh) * (106 J/MJ)) + (0.0023 kPa m−1 °C−1 * (1.13 kPa − 2.06 kPa))/(1 + 0.0023 kPa m−1 °C−1/0.65 kPa °C−1)
λE ≈ 10.3 MJ/m2 day (approximately) - (d)
- Converting MJ/m2 day to mm/day:ET (mm/day) = λE * (24 h/day) * (103 J/MJ) * (1 m2/106 mm2)
ET (mm/day) ≈ 10.3 MJ/m2 day * 24 h/day * 103 J/MJ * 1 m2/106 mm2
ET (mm/day) ≈ 247 mm/day (approximately)
- Iteration result:When the measured relative humidity decreased from 60% to 55%, the calculated ETo value increased from 221 mm/day to 247 mm/day. But, it is still higher than the target ETo of 150 mm/day (AquaTrap target value).
- Important considerations:
- (a)
- This is still an iterative process, and the optimal measurements will also depend on the specific conditions.
- (b)
- The estimated data points may not reflect the actual conditions perfectly (three sensors are not enough).
- (c)
- ETo values are (± 15%) and the actual ET may vary due to factors like soil type, plant cover, and management practices.
5.1.3. Minimum Membrane Cover Area Calculation
- Total water needed: We need to consider both the daily water needs of the tree (1.5 L) and the 15% error rate for potential water loss.
- Total Water Needed = Daily Water Need (1.5 L) * (1 + Error Rate).
- Total Water Needed = 1.5 L * (1 + 0.15).
- Total Water Needed = 1.725 L (rounded to two decimal places).
- Cover Area Calculation: Now, we can use the ETo value, and the total water needed to calculate the required cover area (Table 6).
- Cover Area (m2) = Total Water Needed (liters/day)/(ETo (mm/day) * 1000 * (1 − Error Rate)).
- Calculated ETo for May (according to RH = 40%):
- ETo value (from previous table) = 0.38 mm/day.
- Total Water Needed (calculated above) = 1.725 L/day.
- Error Rate = 0.15.
- Cover Area (m2) = 1.725/(0.38 * 1000 * (1 − 0.15)).
- Cover Area (m2) ≈ 4.97 (rounded to two decimal places). Average 5 m2 membrane is enough to collect 1.5 L of water for each tree.
5.2. Results of the AquaTrap Prototype Test in Akseki/Antalya
- Effects on ET rates: Measurements conducted in May (a period characterized by heavy rainfall and high humidity) revealed that the observed ETo values were higher than those previously estimated by FAO/Crop Water (by 30–55%). This suggests that the region may face a higher demand for water than previously anticipated.
- The field experiment with AquaTrap conducted in Akseki, Antalya, Turkey, demonstrates promising results, emphasizing the potential of this biomimetic irrigation system to improve water management practices in arid regions. The results are evaluated in two stages: the verification of ETo values (the verification stage of the water source and the transportation of this water to the roots) and the comparison of these results with theoretical expectations.
- According to theoretical calculations conducted before the field study, it was found that the required membrane surface area under the tree canopy could be reduced by 35% in this field study. However, the high ETo rates have altered these results.
- The findings of the study indicate that AquaTrap effectively captures and delivers water to newly planted pomegranate trees, significantly supporting their growth and survival in a water-limited environment. An experiment providing around 1 L of water per day to pomegranate seedlings for 30 days suggests the potential for sustaining growth despite theoretical losses (observed at 15% in membranes and 5–8% in water transfer pipes). This indicates that the daily target of 1.5 L can be exceeded.
- When calculating the membrane area for different regions and species, it is considered that the calculation system can be adapted to include a standard deviation value to preserve the target water quantity based on the margin of error. It has been observed that increasing membrane quality (the lotus effect) can enhance efficiency and reduce losses in field applications.
- Following the field tests and calculations, it was determined that a 2.5 × 2.5 m2 membrane cover for pomegranate trees in the Akseki, Antalya region is adequate for reaching the daily 1.5 L target. Despite using a 3 × 3 m2 cover in the practical application, it was found that 1.7–1.8 L of water could be harvested daily with an ETo value of 0.20 in the soil during spring months, such as May, when evaporation is most pronounced. Consequently, the AquaTrap system in the Antalya/Akseki, Turkey application shows promise for future efficiency, as suggested by the achieved results.
Recommendations for Future Research
- Long-Term Impact Assessment: Long-term studies evaluating the sustainable effectiveness of AquaTrap on tree growth, yield, and water use efficiency are predicted to be beneficial for the product’s development and results.
- Effect of External Precipitation: Although the product’s capacity to collect water during external precipitation events (such as rain or hail) has been observed, this input has not been measured. It is necessary to measure this feature at a different study level, as it may yield higher results than theoretical studies. Storing collected water within the system, depending on its density, could lead to much more effective results.
- Comparative Analysis: Comparing the performance of AquaTrap with other irrigation systems under changing environmental conditions and water availability scenarios is expected to demonstrate the solution’s effectiveness more intensively.
- Economic Feasibility Assessment: Demonstrating the economic feasibility of the AquaTrap application, including initial investment costs, maintenance requirements, potential savings in water usage, and labor, is crucial for its widespread adoption.
5.3. Potential Effects of RH, Soil Moisture, and AquaTrap-like Systems for Sustainable Forestry
- Fighting Moisture Stress: By reducing moisture stress, encouraging root development, and reducing transpiration, systems like AquaTrap significantly increase the survival rates of newly planted trees, especially in harsh environments. This is especially important for reforestation projects and drought-prone areas. Traditional irrigation methods can be inefficient and inadequate, and as the humidity of the environment decreases, it can become increasingly difficult for newly planted trees to survive due to increased evaporation [83]. Systems like AquaTrap have been developed to overcome this difficulty by collecting the condensation losses caused by this evaporation and directing it to the root area of the sapling. Soil moisture conservation significantly improves the survival and growth rates of newly planted tree seedlings. Adequate soil moisture promotes root development and nutrient uptake, increasing their chances of survival and growth [79,82]. This targeted water distribution ensures that the most important part of the young tree receives the moisture it needs for survival and initial growth.
- Reducing Water Consumption: Traditional irrigation methods often lead to water loss and wastage. Directing water directly to the root zone and conserving soil moisture can significantly improve water use efficiency. The lotus-effect method directs the water droplets falling on the external surface of the tension membrane during short-term external rainfall movements first to the system’s collection channels and then to the tree’s roots, thereby increasing the moisture in the root area and enhancing plant development [80,84].
- Root Development and Nutrient Uptake: Adequate soil moisture in the root zone is important for healthy root development. Roots play a vital role in absorbing water and nutrients from the soil that are necessary for trees to grow. AquaTrap systems support optimal root development by maintaining consistent moisture levels around the roots. This allows the tree to access more water and nutrients from the surrounding soil, leading to faster and healthier growth [83,85].
- Reduced Sweating: In hot, dry conditions, trees lose water through transpiration, a natural process in which they release water vapor from their leaves. Excessive transpiration can stress the tree and stunt its growth. AquaTrap systems help reduce transpiration rates in young trees by preserving soil moisture. This preserves water within the plant and allows it to focus its energy on growth and development [81].
- Controlling Erosion: The term “slope erosion” describes the process by which water and wind wear away the top layer of soil along a hillside. Blown or washed topsoil can accumulate at the hill’s base or pollute surrounding bodies of water as sediments. Erosion on the slope reduces soil fertility, which, without control measures, eventually renders the land wholly unfit for plant growth. Soil moisture conservation aids in erosion control by stabilizing the soil and regulating water flow. This is particularly important on sloping terrains or areas prone to heavy precipitation [83,84].
- Mitigating Forest Fire Risk: High soil moisture and dense understory vegetation can significantly reduce forest fire risk [85]. By promoting these conditions, AquaTrap can help mitigate this threat.
- Reducing Chemical Pesticide Use: Healthy trees tend to be more resistant to pest infestations and similar systems, by ensuring tree survival and growth, can potentially reduce our reliance on chemical pesticides [86].
- Enhancing Biomass Production: Healthy trees that grow faster and produce more wood can significantly increase biomass production. AquaTrap, by promoting the growth of such trees, can encourage biomass production [87].
- Boosting Carbon Sequestration: Adequate soil moisture helps trees absorb more carbon dioxide and store it in their biomass. This implies that AquaTrap and similar systems can play a crucial role in mitigating greenhouse gas emissions and combating climate change [88].
5.4. The Future of AquaTrap Systems and Potential Challenges
- Scalability: While the system has shown effectiveness on a small scale, its ability to be scaled up to larger agricultural operations is a key area to explore. Adapting the system for use in extensive farming landscapes could increase its impact, addressing water scarcity on a wider scale.
- Material Innovation: Further research into the materials used for the AquaTrap system could improve its durability, cost-effectiveness, and environmental impact. Exploring biodegradable or more sustainable materials may enhance its eco-friendliness and appeal to a broader audience.
- Technological Integration: Incorporating smart technology, such as sensors for moisture levels and automated water release mechanisms, could boost the system’s efficiency and user-friendliness. This integration solution would allow for more precise water management possibilities and can easily tailored to the specific needs of each plant or tree.
- Market Penetration Strategies: To expand the AquaTrap system’s market reach, innovative marketing and distribution strategies are crucial. Collaborations with agricultural organizations, endorsements from sustainability advocates, and using social media for awareness campaigns could increase visibility and adoption rates.
- Customization and Flexibility: Improving the system’s ability to adapt to different trees, soil types, and climatic conditions would make it a more versatile solution for global agricultural challenges. AquaTrap offers customizable options for various agricultural needs, and it can also enhance its usefulness and appeal to a wider range of users.
- Educational Initiatives: Developing educational programs and materials to educate farmers, gardeners, and agricultural stakeholders about the benefits and operation of the AquaTrap system can facilitate its acceptance and use. Training sessions, workshops, and demonstration projects could be effective tools for engagement and knowledge sharing.
6. Conclusions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Sector | Impact of Water Scarcity | Estimated % of Global Water Use (2020) | Forecasted % of Global Water Use (2030) | Forecasted % of Global Water Use (2040) |
---|---|---|---|---|
Agriculture | Reduced crop yields, food insecurity | 70 | 71 | 72 |
Industry | Production disruptions, economic losses | 20 | 19 | 18 |
Domestic | Limited access to clean water, sanitation challenges | 10 | 10 | 10 |
Challenge | Impact | Mitigation Strategies |
---|---|---|
Water scarcity | Reduced food production, environmental degradation, socio-economic hardships | Rainwater harvesting, improved water infrastructure, water conservation practices |
Inefficient irrigation practices | Low water use efficiency, salinization, soil degradation, high energy consumption | Implementing water-efficient technologies (drip irrigation and precision agriculture), improved water management practices |
Climate change | Increased water scarcity, unpredictable weather patterns | Investing in renewable energy sources for irrigation, adopting climate-smart agricultural practices |
Design Principle | Description |
---|---|
Microscale and Nanoscale Hierarchical Structures | Lotus leaves possess a hierarchical structure consisting of microscale bumps covered with nanoscale wax crystals. This structure creates a rough and textured surface that minimizes the contact area between water droplets and the leaf surface. |
Low Surface Energy | The wax coating on lotus leaves provides them with a low surface energy, making them highly hydrophobic. This low surface energy causes water droplets to minimize contact with the surface, forming nearly spherical droplets with high contact angles. |
Self-Cleaning Mechanism | As water droplets roll off the surface, they pick up particles and debris, effectively cleaning the surface in the process. This self-cleaning mechanism is facilitated by the combination of the hierarchical surface structure and low surface energy, promoting the easy removal of water droplets and any adhered contaminants [61]. |
Enhanced Water Repellency | The combination of hierarchical surface structures and low surface energy results in exceptional water repellency, preventing water from wetting the surface and promoting self-cleaning behavior. The spherical shape of water droplets and their easy removal from the surface contribute to the maintenance of cleanliness and the preservation of hydrophobic properties over time. |
Design Principle | Description |
---|---|
Micro- and Nanostructured Surfaces | Banana leaves possess hierarchical surface structures at the micro- and nanoscales, comprising ridges, grooves, and wax crystals. These structures minimize the contact area between water droplets and the leaf surface, promoting water repellency and easy shedding (Figure 3). |
Hydrophobicity | The surface of banana leaves is coated with hydrophobic compounds, such as waxes and oils, enhancing their water-repellent properties. This hydrophobicity prevents water from adhering to the leaf surface, facilitating the collection and runoff of water droplets (Figure 3) [69]. |
Self-Cleaning Mechanism | When water droplets roll off the surface of banana leaves, they carry away dust, dirt, and debris, effectively cleaning the leaf surface. This self-cleaning mechanism ensures the maintenance of water collection efficiency over time. |
Month | RH = 40% | RH = 50% | RH = 60% | ETo (mm/day for m2) | Deviation |
---|---|---|---|---|---|
January | 0.33 | 0.24 | 0.21 | 0.26 | −0.03 |
February | 0.34 | 0.25 | 0.22 | 0.27 | −0.02 |
March | 0.34 | 0.25 | 0.22 | 0.27 | −0.02 |
April | 0.34 | 0.25 | 0.22 | 0.27 | −0.02 |
May | 0.338 | 0.247 | 0.221 | 0.269 | +0.00 |
June | 0.54 | 0.36 | 0.31 | 0.40 | +0.131 |
July | 0.55 | 0.34 | 0.29 | 0.38 | +0.111 |
August | 0.51 | 0.33 | 0.28 | 0.37 | +0.101 |
September | 0.50 | 0.32 | 0.27 | 0.36 | +0.091 |
October | 0.51 | 0.33 | 0.28 | 0.37 | +0.101 |
November | 0.52 | 0.34 | 0.29 | 0.38 | +0.111 |
December | 0.54 | 0.36 | 0.31 | 0.40 | +0.131 |
Month | RH = 40% (m2) | RH = 50% (m2) | RH = 60% (m2) | ETo (mm/day for m2) |
---|---|---|---|---|
January | 0.14 | 0.14 | 0.14 | 0.26 |
February | 0.17 | 0.14 | 0.12 | 0.27 |
March | 0.20 | 0.18 | 0.17 | 0.27 |
April | 0.20 | 0.16 | 0.15 | 0.27 |
May | 0.30 | 0.26 | 0.20 | 0.269 |
June | 0.42 | 0.37 | 0.31 | 0.40 |
July | 0.43 | 0.36 | 0.28 | 0.38 |
August | 0.43 | 0.33 | 0.34 | 0.37 |
September | 0.39 | 0.32 | 0.32 | 0.36 |
October | 0.37 | 0.31 | 0.30 | 0.31 |
November | 0.35 | 0.30 | 0.24 | 0.27 |
December | 0.30 | 0.24 | 0.19 | 0.26 |
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Gürsu, H. An Affordable System Solution for Enhancing Tree Survival in Dry Environments. Sustainability 2024, 16, 5994. https://doi.org/10.3390/su16145994
Gürsu H. An Affordable System Solution for Enhancing Tree Survival in Dry Environments. Sustainability. 2024; 16(14):5994. https://doi.org/10.3390/su16145994
Chicago/Turabian StyleGürsu, Hakan. 2024. "An Affordable System Solution for Enhancing Tree Survival in Dry Environments" Sustainability 16, no. 14: 5994. https://doi.org/10.3390/su16145994
APA StyleGürsu, H. (2024). An Affordable System Solution for Enhancing Tree Survival in Dry Environments. Sustainability, 16(14), 5994. https://doi.org/10.3390/su16145994