Time filter

Source Type

Sayer J.,James Cook University | Sunderland T.,Center for International Forestry Research | Ghazoul J.,Institute of Terrestrial Ecosystems | Pfund J.-L.,Fauna | And 12 more authors.
Proceedings of the National Academy of Sciences of the United States of America | Year: 2013

"Landscape approaches" seek to provide tools and concepts for allocating and managing land to achieve social, economic, and environmental objectives in areas where agriculture, mining, and other productive land uses compete with environmental and biodiversity goals. Here we synthesize the current consensus on landscape approaches.This is based on published literature and a consensus-building process to define good practice and is validated by a survey of practitioners.We find the landscape approach has been refined in response to increasing societal concerns about environment and development tradeoffs. Notably, there has been a shift from conservation-orientated perspectives toward increasing integration of poverty alleviation goals. We provide 10 summary principles to support implementation of a landscape approach as it is currently interpreted.These principles emphasize adaptive management, stakeholder involvement, and multiple objectives.Various constraints are recognized, with institutional and governance concerns identified as the most severe obstacles to implementation. We discuss how these principles differ from more traditional sectoral and project-based approaches. Although no panacea, we see few alternatives that are likely to address landscape challenges more effectively than an approach circumscribed by the principles outlined here. Source

Ziegler A.D.,National University of Singapore | Phelps J.,National University of Singapore | Yuen J.Q.,National University of Singapore | Webb E.L.,National University of Singapore | And 12 more authors.
Global Change Biology | Year: 2012

Policy makers across the tropics propose that carbon finance could provide incentives for forest frontier communities to transition away from swidden agriculture (slash-and-burn or shifting cultivation) to other systems that potentially reduce emissions and/or increase carbon sequestration. However, there is little certainty regarding the carbon outcomes of many key land-use transitions at the center of current policy debates. Our meta-analysis of over 250 studies reporting above- and below-ground carbon estimates for different land-use types indicates great uncertainty in the net total ecosystem carbon changes that can be expected from many transitions, including the replacement of various types of swidden agriculture with oil palm, rubber, or some other types of agroforestry systems. These transitions are underway throughout Southeast Asia, and are at the heart of REDD+ debates. Exceptions of unambiguous carbon outcomes are the abandonment of any type of agriculture to allow forest regeneration (a certain positive carbon outcome) and expansion of agriculture into mature forest (a certain negative carbon outcome). With respect to swiddening, our meta-analysis supports a reassessment of policies that encourage land-cover conversion away from these [especially long-fallow] systems to other more cash-crop-oriented systems producing ambiguous carbon stock changes - including oil palm and rubber. In some instances, lengthening fallow periods of an existing swidden system may produce substantial carbon benefits, as would conversion from intensely cultivated lands to high-biomass plantations and some other types of agroforestry. More field studies are needed to provide better data of above- and below-ground carbon stocks before informed recommendations or policy decisions can be made regarding which land-use regimes optimize or increase carbon sequestration. As some transitions may negatively impact other ecosystem services, food security, and local livelihoods, the entire carbon and noncarbon benefit stream should also be taken into account before prescribing transitions with ambiguous carbon benefits. © 2012 Blackwell Publishing Ltd. Source

Knaus F.,Institute of Terrestrial Ecosystems
Eco.mont | Year: 2013

Monitoring is a key activity in biosphere reserves and other parks. It is often used as a basis for evaluating the development of a reserve and the success of the protected area management. Monitoring activities hold many pitfalls, as shown by results from a project in the UNESCO Biosphere Reserve Entlebuch. Creating a causal link between management activities and monitoring results is one major challenge. Additional difficulties arise from often used non-systematic data originating from external sources. Embedding the available data in a simple conceptual model that links aims and key system factors with sustainability indicators could alleviate some of the problems encountered. Source

Snell R.S.,Institute of Terrestrial Ecosystems | Huth A.,Helmholtz Center for Environmental Research | Nabel J.E.M.S.,Swiss Federal Institute of forest | Nabel J.E.M.S.,ETH Zurich | And 14 more authors.
Ecography | Year: 2014

Dynamic vegetation models (DVMs) follow a process-based approach to simulate plant population demography, and have been used to address questions about disturbances, plant succession, community composition, and provisioning of ecosystem services under climate change scenarios. Despite their potential, they have seldom been used for studying species range dynamics explicitly. In this perspective paper, we make the case that DVMs should be used to this end and can improve our understanding of the factors that influence species range expansions and contractions. We review the benefits of using process-based, dynamic models, emphasizing how DVMs can be applied specifically to questions about species range dynamics. Subsequently, we provide a critical evaluation of some of the limitations and trade-offs associated with DVMs, and we use those to guide our discussions about future model development. This includes a discussion on which processes are lacking, specifically a mechanistic representation of dispersal, inclusion of the seedling stage, trait variability, and a dynamic representation of reproduction. We also discuss upscaling techniques that offer promising solutions for being able to run these models efficiently over large spatial extents. Our aim is to provide directions for future research efforts and to illustrate the value of the DVM approach. © 2014 The Authors. Source

Moradi A.B.,Institute of Terrestrial Ecosystems | Swoboda S.,University of Natural Resources and Life Sciences, Vienna | Robinson B.,Institute of Terrestrial Ecosystems | Prohaska T.,University of Natural Resources and Life Sciences, Vienna | And 4 more authors.
Environmental and Experimental Botany | Year: 2010

Quantitative studies of the distribution pattern of metals in plant tissues provide important information on the potential of metal-accumulator plants for remediation and amelioration of contaminated soils. We used laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) as well as staining with dimethylglyoxime (DMG) to investigate the distribution pattern of nickel (Ni) in root cross-sections of the Ni-hyperaccumulator plant Berkheya coddii Rossler. Plants were grown in rhizoboxes containing soil with 125 mg kg-1 Ni. Roots were embedded in resin and cut into sections for LA-ICP-MS analysis. For DMG-staining analysis, fresh root cross-sections were prepared using a microtome. LA-ICP-MS revealed higher Ni concentrations in the cortex (374 ± 66 mg kg-1) than in the stele (210 ± 48 mg kg-1) of the investigated roots. The distribution pattern agreed well with those found by DMG-staining. Higher concentrations of Ni were found in the stele compared to the cortex of roots of the control plants not exposed to elevated soil Ni using both techniques. Our results indicate that an active uptake or ion selection mechanism exists for B. coddii in the absence of available Ni in the rhizosphere. © 2010 Elsevier B.V. All rights reserved. Source

Discover hidden collaborations