نتایج جستجو برای: tropical forests

تعداد نتایج: 102462  

Journal: :Nature 1974

2000
Stephan Schwartzman Daniel Nepstad

Large, pristine, uninhabited parks are the defining criterion of success in conserving tropical forests, according to some conservationists. It is argued that human residents in tropical forests inevitably deplete populations of large animals through hunting, triggering a chain reaction of ecological events that greatly diminish the conservation value of these forests. Hence, the removal of peo...

2006
Eliane Ceccon Pilar Huante Emanuel Rincón

Tropical dry forests represent nearly half the tropical forests in the world and are the ecosystems registering the greatest deterioration from the anthropogenic exploitation of the land. This paper presents a review on the dynamics of tropical dry forests regeneration and the main abiotic factors influencing this regeneration, such as seasonal nature, soil fertility and humidity, and natural a...

Journal: :Trends in ecology & evolution 2005
S Joseph Wright

Understanding and mitigating the impact of an ever-increasing population and global economic activity on tropical forests is one of the great challenges currently facing biologists, conservationists and policy makers. Tropical forests currently face obvious regional changes, both negative and positive, and uncertain global changes. Although deforestation rates have increased to unprecedented le...

Journal: :Ecology letters 2011
Cory C Cleveland Alan R Townsend Philip Taylor Silvia Alvarez-Clare Mercedes M C Bustamante George Chuyong Solomon Z Dobrowski Pauline Grierson Kyle E Harms Benjamin Z Houlton Alison Marklein William Parton Stephen Porder Sasha C Reed Carlos A Sierra Whendee L Silver Edmund V J Tanner William R Wieder

Tropical rain forests play a dominant role in global biosphere-atmosphere CO(2) exchange. Although climate and nutrient availability regulate net primary production (NPP) and decomposition in all terrestrial ecosystems, the nature and extent of such controls in tropical forests remain poorly resolved. We conducted a meta-analysis of carbon-nutrient-climate relationships in 113 sites across the ...

2015
Gillian Petrokofsky Plinio Sist Lilian Blanc Jean-Louis Doucet Bryan Finegan Sylvie Gourlet-Fleury John R Healey Barbara Livoreil Robert Nasi Marielos Peña-Claros Francis E Putz Wen Zhou

Background: Currently, about 400 million hectares of tropical moist forests worldwide are designated production forests, about a quarter of which are managed by rural communities and indigenous peoples. There has been a gradual impoverishment of forest resources inside selectively logged forests in which the volume of timber extracted over the first cutting cycle was mostly from large, old tree...

2013
Stephen P Hubbell

Data from a global network of large, permanent plots in lowland tropical forests demonstrate (1) that the phenomenon of tropical tree rarity is real and (2) that almost all the species diversity in such forests is due to rare species. Theoretical and empirically based reasoning suggests that many of these rare species are not as geographically widespread as previously thought. These findings su...

Journal: :Science 2013
Kumar Selvarajoo Masaru Tomita

PRIMARY TROPICAL FORESTS ARE POWERhouses of biodiversity (1) but are rapidly declining in extent and are threatened even within some protected areas (2). As a result, non-primary forests, especially those that have been selectively logged, are becoming more important to conservation efforts. In the tropics, logging is almost always selective, targeting only certain commercially valuable tree sp...

2017
Weili Kou Changxian Liang Lili Wei Alexander J. Hernandez Xuejing Yang Christian Ginzler

Updated extent, area, and spatial distribution of tropical evergreen forests from inventory data provides valuable knowledge for research of the carbon cycle, biodiversity, and ecosystem services in tropical regions. However, acquiring these data in mountainous regions requires labor-intensive, often cost-prohibitive field protocols. Here, we report about validated methods to rapidly identify t...

Journal: :Biology letters 2013
Sandra M Durán Ernesto Gianoli

Tropical forests are experiencing structural changes that may reduce carbon storage potential. The recent increase in liana abundance and biomass is one such potential change. Lianas account for approximately 25 per cent of woody stems and may have a strong impact on tree dynamics because severe liana infestation reduces tree growth and increases tree mortality. Based on forest inventory data f...

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