Forests

586 KiB

Open AccessArticle

Influence of Hemlock Woolly Adelgid Infestation Levels on Water Stress in Eastern Hemlocks within the Great Smoky Mountains National Park, U.S.A.

by Carla Coots, Paris Lambdin, Jennifer Franklin, Jerome Grant and Rusty Rhea

Forests 2015, 6(1), 271-279; https://doi.org/10.3390/f6010271 - 20 Jan 2015

Cited by 5 | Viewed by 5867

Abstract

Extensive mortality of eastern hemlock, Tsuga canadensis (L.) Carrière, resulting from infestation by hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), has occurred throughout the eastern United States. Although imidacloprid treatment can reduce tree mortality, its effectiveness can be influenced by several factors [...] Read more.

Extensive mortality of eastern hemlock, Tsuga canadensis (L.) Carrière, resulting from infestation by hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), has occurred throughout the eastern United States. Although imidacloprid treatment can reduce tree mortality, its effectiveness can be influenced by several factors including tree water stress. The relationship between water stress and infestation rates is unknown, and an understanding of these could greatly increase the efficiency of management for this invasive insect. The primary objective of this study was to assess water stress at three levels of hemlock woolly adelgid infestations. Water stress was measured monthly for 13 months in eastern hemlocks classified as <25%, 25%–75%, and >75% infested. The highest level of water stress was found in those trees with hemlock woolly adelgid infestation levels greater than 75%. The lowest level of water stress was found in those trees with less than 25% hemlock woolly adelgid infestation levels. Knowledge of these effects can contribute to development of more effective chemical management strategies. Full article

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7614 KiB

Open AccessReview

Combining Lidar and Synthetic Aperture Radar Data to Estimate Forest Biomass: Status and Prospects

by Sanna Kaasalainen, Markus Holopainen, Mika Karjalainen, Mikko Vastaranta, Ville Kankare, Kirsi Karila and Batuhan Osmanoglu

Forests 2015, 6(1), 252-270; https://doi.org/10.3390/f6010252 - 16 Jan 2015

Cited by 77 | Viewed by 14929

Abstract

Research activities combining lidar and radar remote sensing have increased in recent years. The main focus in combining lidar-radar forest remote sensing has been on the retrieval of the aboveground biomass (AGB), which is a primary variable related to carbon cycle in land [...] Read more.

Research activities combining lidar and radar remote sensing have increased in recent years. The main focus in combining lidar-radar forest remote sensing has been on the retrieval of the aboveground biomass (AGB), which is a primary variable related to carbon cycle in land ecosystems, and has therefore been identified as an essential climate variable. In this review, we summarize the studies combining lidar and radar in estimating forest AGB. We discuss the complementary use of lidar and radar according to the relevance of the added value. The most promising prospects for combining lidar and radar data are in the use of lidar-derived ground elevations for improving large-area biomass estimates from radar, and in upscaling of lidar-based AGB data across large areas covered by spaceborne radar missions. Full article

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200 KiB

Open AccessEditorial

Special Issue: The Potential Role for Community Monitoring in MRV and in Benefit Sharing in REDD+

by Arturo Balderas Torres and Margaret Skutsch

Forests 2015, 6(1), 244-251; https://doi.org/10.3390/f6010244 - 15 Jan 2015

Cited by 9 | Viewed by 6347

Abstract

Since the early design of activities to reduce emissions from deforestation and forest degradation in developing countries (REDD+) under the United Nations Framework Convention on Climate Change (UNFCCC), the need to engage local communities and indigenous groups in monitoring and reporting has been [...] Read more.

Since the early design of activities to reduce emissions from deforestation and forest degradation in developing countries (REDD+) under the United Nations Framework Convention on Climate Change (UNFCCC), the need to engage local communities and indigenous groups in monitoring and reporting has been recognized. REDD+ has advanced under the UNFCCC negotiations, but most countries still need to define formally what the role of communities in their national monitoring systems will be. Previous research and experiences have shown that local communities can effectively contribute in the monitoring of natural resources. This editorial introduces a Special Issue of Forests which discusses the implications of and potential for including community based monitoring (CBM) in monitoring and benefit-sharing systems in REDD+. It outlines the main points of the nine contributions to the Special Issue which cover a wide geographical area and report on projects and research which engages more than 150 communities from eight different countries from Africa, Asia and Latin America. The editorial summarizes how the articles and reports build further understanding of the potential of CBM to contribute to the implementation, monitoring and distribution of benefits in REDD+. It also discusses the results of an on-going opinion survey on issues related to CBM and its relation to benefit sharing, which indicates that there is still disagreement on a number of key elements. Full article

(This article belongs to the Special Issue The Potential Role for Community Monitoring in MRV and in Benefit Sharing in REDD+)

736 KiB

Open AccessArticle

Developing a Quality Assessment Index System for Scenic Forest Management: A Case Study from Xishan Mountain, Suburban Beijing

by Lan Gong, Zhidu Zhang and Chengyang Xu

Forests 2015, 6(1), 225-243; https://doi.org/10.3390/f6010225 - 13 Jan 2015

Cited by 28 | Viewed by 6609

Abstract

The public’s demand for more and better forest landscapes is increasing as scenic forest tours flourish in China, especially in the capital, Beijing. How to improve the quality of scenic forests has become one of the greatest concerns of urban foresters. Although numerous [...] Read more.

The public’s demand for more and better forest landscapes is increasing as scenic forest tours flourish in China, especially in the capital, Beijing. How to improve the quality of scenic forests has become one of the greatest concerns of urban foresters. Although numerous studies have focused on scenic forest management, to date, no reports have been found on developing a quality assessment index system for scenic forest assessment. In this study, a simple and scientific index system was established using an analytical hierarchy process (AHP) to quantitatively assess scenic forest quality. The index system is composed of four scales: individual tree landscape quality, in-forest landscape quality, near-view forest landscape quality and far-view landscape quality. The in-forest landscape quality was determined by horizontal and vertical stand structures, species composition and under-canopy landscape traits. Near-view forest landscape quality was mainly determined by patch characteristics, seasonal change, visibility, color change of patches and stand age class. To test the validity of our quality assessment index system, scenic forests in Xishan were used as a case study. The results show that near-view forest landscape was the most important scale for the overall quality of the scenic forest, according to the priorities of the criterion layer, and the second most important scale was far-view forest landscape. Seasonal change, patch color contrast, patch distribution and patch shape accounted for 52.2% of the total of 13 indices in the near-view forest landscape. The integrated quality of scenic forests in Xishan was at an average level, and the in-forest landscape, near-view landscape and far-view landscape had below average quality. Full article

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1169 KiB

Open AccessArticle

A Methodological Framework for Assessing Agents, Proximate Drivers and Underlying Causes of Deforestation: Field Test Results from Southern Cameroon

by Sophia Carodenuto, Eduard Merger, Eric Essomba, Metodi Panev, Till Pistorius and Joseph Amougou

Forests 2015, 6(1), 203-224; https://doi.org/10.3390/f6010203 - 9 Jan 2015

Cited by 19 | Viewed by 12957

Abstract

The international debates on REDD+ and the expectations to receive results-based payments through international climate finance have triggered considerable political efforts to address deforestation and forest degradation in many potential beneficiary countries. Whether a country will receive such REDD+ payments is largely contingent [...] Read more.

The international debates on REDD+ and the expectations to receive results-based payments through international climate finance have triggered considerable political efforts to address deforestation and forest degradation in many potential beneficiary countries. Whether a country will receive such REDD+ payments is largely contingent on its ability to effectively address the relevant drivers, and to govern the context-dependent agents and forces responsible for forest loss or degradation. Currently, many REDD+ countries are embarking on the necessary analytical steps for their national REDD+ strategies. In this context, a comprehensive understanding of drivers and their underlying causes is a fundamental prerequisite for developing effective policy responses. We developed a methodological framework for assessing the drivers and underlying causes of deforestation and use the Fako Division in Southern Cameroon as a case study to test this approach. The steps described in this paper can be adapted to other geographical contexts, and the results of such assessments can be used to inform policy makers and other stakeholders. Full article

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601 KiB

Open AccessArticle

Variation in Wood Quality in White Spruce (Picea Glauca (Moench) Voss). Part I. Defining the Juvenile–Mature Wood Transition Based on Tracheid Length

by Cyriac Serge Mvolo, Ahmed Koubaa, Jean Beaulieu, Alain Cloutier and Marc J. Mazerolle

Forests 2015, 6(1), 183-202; https://doi.org/10.3390/f6010183 - 8 Jan 2015

Cited by 21 | Viewed by 8691

Abstract

Estimations of transition age (TA) and juvenile wood proportion (JWP) are important for wood industries due to their impact on end-product quality. However, the relationships between analytical determination of TA based on tracheid length (TL) and recognized thresholds for adequate end products have [...] Read more.

Estimations of transition age (TA) and juvenile wood proportion (JWP) are important for wood industries due to their impact on end-product quality. However, the relationships between analytical determination of TA based on tracheid length (TL) and recognized thresholds for adequate end products have not yet been established. In this study, we used three different statistical models to estimate TA in white spruce (Picea glauca (Moench) Voss) based on TL radial variation. We compared the results with technological maturity. A two-millimeter threshold, previously suggested for good paper tear strength, was used. Tracheid length increased from pith to bark and from breast height to upper height. Juvenile wood (JW) was conical with the three models. At breast height, TA ranged from 11 to 27 years and JWP ranged from 15.3% to 47.5% across the three models. The linear mixed model produced more conservative estimates than the maximum-quadratic-linear (M_Q_L) model. Both the linear mixed model and the M_Q_L model produced more conservative TA estimates than the piecewise model. TA estimates by the MIXED model, and to a lesser extent by the M_Q_L model, were equivalent to those for real mature wood, whereas TA estimates by the piecewise model were considerably lower, falling into the transition wood area. Full article

(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 79 Sustainable Management of Spruce Dominated Ecosystems in Response to Climate Change)

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980 KiB

Open AccessArticle

Decision Support Systems (DSS) Optimal—A Case Study from the Czech Republic

by Robert Marušák, Jan Kašpar and Petr Vopěnka

Forests 2015, 6(1), 163-182; https://doi.org/10.3390/f6010163 - 8 Jan 2015

Cited by 10 | Viewed by 6867

Abstract

Forest managers have traditionally planned harvests using their expert knowledge. This applies mainly to the spatial distribution of harvest units. The amount of timber to be harvested is regulated by market demand. In addition to forest managers’ expert knowledge, there is a set [...] Read more.

Forest managers have traditionally planned harvests using their expert knowledge. This applies mainly to the spatial distribution of harvest units. The amount of timber to be harvested is regulated by market demand. In addition to forest managers’ expert knowledge, there is a set of rules, which can be automatized. Computerized harvest planning will lead not only to saving time of forest managers, but it will also enable them to explore various scenarios in a matter of minutes. We introduce Optimal—GIS tool for spatial and temporal decisions of harvest scheduling. Optimal allows creating new harvest units, which reflects the forestry act and/or forest managers’ requirements. Optimal includes necessary tools for automatic controlling of harvest unit parameters. It allows alternative harvest scheduling, while taking into account different constraints. Optimal is a decision Support System designed and applied for clear-cut and shelterwood silvicultural systems with respect to the environmental and economic constraints. Full article

(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 118 Providing Ecosystem Services under Climate Change: Community of Practice of Forest Decision Support Systems)

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177 KiB

Open AccessEditorial

Acknowledgement to Reviewers of Forests in 2014

by Forest Editorial Office

Forests 2015, 6(1), 157-162; https://doi.org/10.3390/f6010157 - 7 Jan 2015

Viewed by 4935

Abstract

The editors of Forests would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2014:[...] Full article

2204 KiB

Open AccessCase Report

Case Study Report: Community-Based Monitoring Systems for REDD+ in Guyana

by Helen Bellfield, David Sabogal, Lucy Goodman and Matt Leggett

Forests 2015, 6(1), 133-156; https://doi.org/10.3390/f6010133 - 6 Jan 2015

Cited by 33 | Viewed by 11437

Abstract

A fundamental component of initiatives to reduce emissions from deforestation and forest degradation (REDD+); will be the development of robust and cost-effective measuring, reporting, and verification (MRV) instruments for national forest monitoring and safeguard information systems. It is increasingly recognized that community-based monitoring [...] Read more.

A fundamental component of initiatives to reduce emissions from deforestation and forest degradation (REDD+); will be the development of robust and cost-effective measuring, reporting, and verification (MRV) instruments for national forest monitoring and safeguard information systems. It is increasingly recognized that community-based monitoring (CBM) offers a positive model for greater participation and engagement of indigenous and forest-dependent communities within a REDD+ framework. Yet plans for CBM within REDD+ MRV systems remain limited, and there are currently relatively few concrete examples of CBM informing national forest monitoring systems. This paper outlines findings from a community MRV project with Amerindian communities in the North Rupununi, Guyana; and demonstrates that a CBM approach can enable key REDD+ requirements: in understanding local deforestation drivers and measuring carbon stocks; and for providing information on safeguards through social and environmental assessments. In addition, the authors discuss community capacity-building on smartphone technology for monitoring as a challenging yet viable pathway for scaling the use and adoption of indigenous knowledge and local skills for REDD+ programs. Full article

(This article belongs to the Special Issue The Potential Role for Community Monitoring in MRV and in Benefit Sharing in REDD+)

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20885 KiB

Open AccessArticle

Topography- and Species-Dependent Climatic Responses in Radial Growth of Picea meyeri and Larix principis-rupprechtii in the Luyashan Mountains of North-Central China

by Wentao Zhang, Yuan Jiang, Mingchang Wang, Lingnan Zhang and Manyu Dong

Forests 2015, 6(1), 116-132; https://doi.org/10.3390/f6010116 - 6 Jan 2015

Cited by 13 | Viewed by 6422

Abstract

Dendroecological techniques were used to examine the relationships between topographic aspects, climate factors and radial growth of Picea meyeri and Larix principis-rupprechtii in Luyashan Mountains, North-Central China. Four sites were selected at timberline and totally 67 trees and 134 cores were collected. Pearson [...] Read more.

Dendroecological techniques were used to examine the relationships between topographic aspects, climate factors and radial growth of Picea meyeri and Larix principis-rupprechtii in Luyashan Mountains, North-Central China. Four sites were selected at timberline and totally 67 trees and 134 cores were collected. Pearson correlation and regression surface analysis were conducted to reveal the growth-climate relationships. The results indicated that the two species both showed significant negative correlations with temperature during preceding November on the two topographic aspects. On both slope aspects, growth of P. meyeri exhibited significant negative correlations with precipitation in current June, whereas growth of L. principis-rupprechtii showed significant negative correlations with precipitation in preceding September. On north-facing slope, tree growth was limited by low temperature in early growing season, which not shown on south-facing slope. If climate warming continues, L. principis-rupprechtii may be more favored and a reverse between relationships with temperature and precipitation maybe occur in growth of trees. Treeline position on the north-facing slope may possess a greater potential for elevation shifting than the south-facing slope. Our results supply useful information for discussing the potential effect of future climate on the forest growth in North-Central China. Full article

(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 79 Sustainable Management of Spruce Dominated Ecosystems in Response to Climate Change)

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2149 KiB

Open AccessArticle

The Challenge of Governing Africa’s New Agricultural Investment Landscapes: An Analysis of Policy Arrangements and Sustainability Outcomes in Ethiopia and Nigeria

by George C. Schoneveld

Forests 2015, 6(1), 88-115; https://doi.org/10.3390/f6010088 - 30 Dec 2014

Cited by 7 | Viewed by 7505

Abstract

In the context of globalization, market liberalization, and deregulation, many African governments are embracing the potential of private agricultural investment to address structural issues within their agricultural economies. Sustainably integrating these investments into target landscapes, however, poses a number of governance challenges since [...] Read more.

In the context of globalization, market liberalization, and deregulation, many African governments are embracing the potential of private agricultural investment to address structural issues within their agricultural economies. Sustainably integrating these investments into target landscapes, however, poses a number of governance challenges since it requires careful reconciliation of competing needs, priorities, and land uses. This paper examines the effectiveness of existing policy arrangements in managing these conflicts within two environmentally significant investment landscapes, the Oban-Korup Forest Block, Nigeria, and Lower Baro-Akobo River Basin, Ethiopia. Findings reveal that investments tend to conflict with socially and environmentally valuable land uses, largely as a result of institutional failings. The paper identifies a number of underlying institutional challenges that need to be addressed in order to achieve sustainable development objectives within Africa’s many emerging investment landscapes. Findings have relevance for the development of sustainable landscape governance systems and the alignment of global governance innovations with landscape-level policy arrangements. Full article

(This article belongs to the Special Issue Governing Forest Landscapes: Challenges and Ways Forward)

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1652 KiB

Open AccessArticle

A Decision Support System for Assessing Trade-Offs between Ecosystem Management Goals: An Application in Portugal

by Jordi Garcia-Gonzalo, Vladimir Bushenkov, Marc E. McDill and José G. Borges

Forests 2015, 6(1), 65-87; https://doi.org/10.3390/f6010065 - 30 Dec 2014

Cited by 43 | Viewed by 8393

Abstract

Cork oak (Quercus suber L.) and holm oak (Quercus rotundifolia) ecosystems are characteristic of Mediterranean forestry in Portugal. Even though cork is the most valuable product, these ecosystems provide multiple products and services. Assessing trade-offs between multiple goals is thus [...] Read more.

Cork oak (Quercus suber L.) and holm oak (Quercus rotundifolia) ecosystems are characteristic of Mediterranean forestry in Portugal. Even though cork is the most valuable product, these ecosystems provide multiple products and services. Assessing trade-offs between multiple goals is thus critical for the effectiveness of oak ecosystem management planning. This paper focuses on the development of a decision support system for oak ecosystems’ scenario analysis including multiple criteria. It includes an innovative decision support systems (DSS) functionality to assess trade-offs between the criteria that may support negotiation and consensus building between decision-makers and forest stakeholders. Specifically, a module that encapsulates the Feasible Goals Method/Interactive Decision Maps (FGM/IDM) technique is developed for interactive visualization of the Pareto frontier. The Pareto frontier illustrates the degree to which improving one particular criterion requires accepting sacrifices in the achievements of others. It thus provides information about trade-offs between competing decision-makers’ preferences. Results are discussed for a large-scale application encompassing over 1 million ha of cork and holm oak forest ecosystems in Southern Portugal. This study demonstrates the potential of the new DSS functionality to enhance multi-objective forest planning, namely by facilitating participation by stakeholders and providing transparency to the decision-making processes. Full article

(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 118 Providing Ecosystem Services under Climate Change: Community of Practice of Forest Decision Support Systems)

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460 KiB

Open AccessArticle

Economic Forest Sustainability: Comparison between Lithuania and Sweden

by Vilis Brukas, Stasys Mizaras and Diana Mizaraitė

Forests 2015, 6(1), 47-64; https://doi.org/10.3390/f6010047 - 29 Dec 2014

Cited by 13 | Viewed by 6472

Abstract

The study conceptualizes economic forest sustainability as “the forest-related income and economic well-being sustained over time” and then compares Lithuania and Sweden at different scales. Sweden adopts a holistic perspective of the forest sector, where forestry and forest industries are perceived as a [...] Read more.

The study conceptualizes economic forest sustainability as “the forest-related income and economic well-being sustained over time” and then compares Lithuania and Sweden at different scales. Sweden adopts a holistic perspective of the forest sector, where forestry and forest industries are perceived as a well-integrated economic branch. Forestry is expected to deliver raw material to forest industries, at the same time creating good preconditions for profitable forest management. Forest owners are given large freedom to act according to market signals and their own household needs, while the resulting intensive forest management cumulatively leads to a significant contribution to the country’s welfare. Lithuania, in contrast, lacks an integrated sector perspective, forestry and forest industries being regarded as two separate realms. Private forest property rights are severely constrained by numerous legislative stipulations, leading to a significant reduction of economic value in production forests. On top of that, thirty percent of private owners face additional restrictions through forestland zoning, leading to further substantial loss of economic value. We suggest several measures for improving the economic forest sustainability in Lithuania, where a genuine national forest program could serve as a suitable bearing medium. Full article

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2629 KiB

Open AccessArticle

Design Features behind Success of the Ecosystem Management Decision Support System and Future Development

by Keith Reynolds, Steven Paplanus, Bruce Miller and Philip Murphy

Forests 2015, 6(1), 27-46; https://doi.org/10.3390/f6010027 - 26 Dec 2014

Cited by 8 | Viewed by 6269

Abstract

The Ecosystem Management Decision Support (EMDS) system is an application framework for designing and implementing spatially enabled knowledge-based decision support systems for environmental analysis and planning at any geographic scale(s). The system integrates state-of-the-art geographic information system, as well as knowledge-based reasoning and [...] Read more.

The Ecosystem Management Decision Support (EMDS) system is an application framework for designing and implementing spatially enabled knowledge-based decision support systems for environmental analysis and planning at any geographic scale(s). The system integrates state-of-the-art geographic information system, as well as knowledge-based reasoning and decision modeling, technologies to provide decision support for the adaptive management process of ecosystem management. It integrates a logic engine to perform landscape evaluations, and a decision engine for developing management priorities. The logic component: (1) reasons about large, abstract, multi-faceted ecosystem management problems; (2) performs useful evaluations with incomplete information; (3) evaluates the influence of missing information, and (4) determines priorities for missing information. The planning component determines priorities for management activities, taking into account not only ecosystem condition, but also criteria that account for logistical concerns of potential management actions. Both components include intuitive diagnostic features that facilitate communicating modeling results to a broad audience. Features of the system design that have figured in its success over the past 20 years are highlighted, together with design features planned for the next several versions needed to provide spatial decision support for adaptive management under climate change. Full article

(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 118 Providing Ecosystem Services under Climate Change: Community of Practice of Forest Decision Support Systems)

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1941 KiB

Open AccessArticle

Predicted Changes in Climatic Niche and Climate Refugia of Conservation Priority Salamander Species in the Northeastern United States

by William B. Sutton, Kyle Barrett, Allison T. Moody, Cynthia S. Loftin, Phillip G. DeMaynadier and Priya Nanjappa

Forests 2015, 6(1), 1-26; https://doi.org/10.3390/f6010001 - 24 Dec 2014

Cited by 52 | Viewed by 10770

Abstract

Global climate change represents one of the most extensive and pervasive threats to wildlife populations. Amphibians, specifically salamanders, are particularly susceptible to the effects of changing climates due to their restrictive physiological requirements and low vagility; however, little is known about which landscapes [...] Read more.

Global climate change represents one of the most extensive and pervasive threats to wildlife populations. Amphibians, specifically salamanders, are particularly susceptible to the effects of changing climates due to their restrictive physiological requirements and low vagility; however, little is known about which landscapes and species are vulnerable to climate change. Our study objectives included, (1) evaluating species-specific predictions (based on 2050 climate projections) and vulnerabilities to climate change and (2) using collective species responses to identify areas of climate refugia for conservation priority salamanders in the northeastern United States. All evaluated salamander species were projected to lose a portion of their climatic niche. Averaged projected losses ranged from 3%–100% for individual species, with the Cow Knob Salamander (Plethodon punctatus), Cheat Mountain Salamander (Plethodon nettingi), Shenandoah Mountain Salamander (Plethodon virginia), Mabee’s Salamander (Ambystoma mabeei), and Streamside Salamander (Ambystoma barbouri) predicted to lose at least 97% of their landscape-scale climatic niche. The Western Allegheny Plateau was predicted to lose the greatest salamander climate refugia richness (i.e., number of species with a climatically-suitable niche in a landscape patch), whereas the Central Appalachians provided refugia for the greatest number of species during current and projected climate scenarios. Our results can be used to identify species and landscapes that are likely to be further affected by climate change and potentially resilient habitats that will provide consistent climatic conditions in the face of environmental change. Full article

(This article belongs to the Special Issue The 24th IUFRO World Congress: Session 13 Salamanders: World Icons of Aquatic Biodiversity in Forests)

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Forests, Volume 6, Issue 1 (January 2015) – 15 articles , Pages 1-279

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