نتایج جستجو برای: plantations

تعداد نتایج: 7047  

Journal: :Mathematical and Computer Modelling 2006
Herry Purnomo Philippe Guizol

Co-management of forest resources is a process of governance that enables all relevant stakeholders to participate in the decision-making processes. Illegal logging and forest degradation are currently increasing, and logging bans are ineffective in reducing forest degradation. At the same time interest in forest plantations and concern about poverty problems of neighboring people whose livelih...

2018
Diego Raymundo Jamir Prado-Junior Norberto Emídio de Oliveira-Neto Lucas Dezidério Santana Vagner Santiago do Vale Tamiel Baiocchi Jacobson Paulo Eugênio Alves Macedo de Oliveira Fabrício Alvim Carvalho

Understanding the relationships between Coffea arabica L. and the native tree community of secondary forests regrowing after the abandonment of coffee plantations is important because, as a non-native species in the Neotropics, coffee can outcompete native species, reducing diversity and forests ecosystem services. We aimed to answer three questions: 1) Does coffee regeneration in secondary for...

Journal: :Journal of environmental management 2012
De-Li Zhai Charles H Cannon J W Ferry Slik Cui-Ping Zhang Zhi-Cong Dai

Hainan, the largest tropical island in China, belongs to the Indo-Burma biodiversity hotspot and harbors large areas of tropical forests, particularly in the uplands. The Changhua watershed is the cradle of Hainan's main river and a center of endemism for plants and birds. The watershed contains great habitat diversity and is an important conservation area. We analyzed the impact of rubber and ...

The quantitative performance of wheat crop under 1-5 year old poplar plantations in irrigated agro-ecosystem was studied to ascertain the biological yield of tree and crop. Results revealed that growth and yield of wheat decreased significantly with the increase in poplar age. The per cent reduction in net grain yield was 17% under one year old poplar plantation, which increased to 52.15% under...

The aim of this study was to investigate vegetation composition in broadleaved  and conifers plantations in 220 ha of  Loblloly pine (Pinus taeda), alder (Alnus glutinosa( and poplar (Popolus deltoides) hardwood plantations and its comparison with natural forests in Bibiyanlu protected forest park, Astara. A total of 60 sampling plots of 1000 m2 were taken using randomly-systematic method with1...

2016
Alison R. Styring Roslina Ragai Mohamed Zakaria Frederick H. Sheldon

Understanding foraging strategies of birds is essential to understanding mechanisms of their community assembly. To provide such information on a key Southeast Asian rainforest family, the babblers (Timaliidae), we evaluated foraging behavior and abundance in 7 morphologically and behaviorally similar sympatric species (Cyanoderma erythropterum, C. rufifrons, Stachyris maculata, S. nigricollis,...

2015
Norbert Kunert Alida Mercado Cárdenas Steven Jansen

Tropical tree plantations usually consist of a single exotic fast growing species, but recent research describes positive effects on ecosystem functions from mixed tropical tree plantations. In this review, we present the current knowledge of drought resistance of tropical mixed species plantations and summarize preliminary evidence from a tree biodiversity experiment in Panama. Converting mono...

Journal: :Memorias do Instituto Oswaldo Cruz 2002
Bruce Alexander Emerson Barbosa de Oliveria Emily Haigh Lourenço Leal de Almeida

Transmission of Leishmania was studied in 27 coffee plantations in the Brazilian State of Minas Gerais. Eighteen females and six males (11.6% of the people tested), aged between 7-65 gave a positive response to the Montenegro skin test. Awareness of sand flies based on the ability of respondents to identify the insects using up to seven predetermined characteristics was significantly greater am...

Journal: :Environmental toxicology and chemistry 2013
Edgar Quirós

Spectacled caiman (Caiman crocodilus) are fish-eating crocodilians that inhabit freshwater habitat in tropical regions of the Americas. To assess the exposure of caiman to pesticides from banana plantations, the authors collected whole blood samples (30 mL) from 14 adult caiman that were captured in the North Atlantic region of Costa Rica. Blood samples were analyzed for 70 legacy- and current-...

Journal: :Environmental Health 2008
Luc Multigner Philippe Kadhel Michel Pascal Farida Huc-Terki Henri Kercret Catherine Massart Eustase Janky Jacques Auger Bernard Jégou

BACKGROUND There is increasing evidence that reproductive abnormalities are increasing in frequency in both human population and among wild fauna. This increase is probably related to exposure to toxic contaminants in the environment. The use of sentinel species to raise alarms relating to human reproductive health has been strongly recommended. However, no simultaneous studies at the same site...

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