نتایج جستجو برای: forest fragmentation

تعداد نتایج: 139402  

2017
Peter Potapov Matthew C Hansen Lars Laestadius Svetlana Turubanova Alexey Yaroshenko Christoph Thies Wynet Smith Ilona Zhuravleva Anna Komarova Susan Minnemeyer Elena Esipova

An intact forest landscape (IFL) is a seamless mosaic of forest and naturally treeless ecosystems with no remotely detected signs of human activity and a minimum area of 500 km2. IFLs are critical for stabilizing terrestrial carbon storage, harboring biodiversity, regulating hydrological regimes, and providing other ecosystem functions. Although the remaining IFLs comprise only 20% of tropical ...

2011

Model systems are needed to examine fragment area effects on food web structure where other factors are relatively constant. Human-induced fragmentation is typically associated with human activities, which may complicate interpretation of results from fragmentation studies. Forests on Hawai`i Island periodically experience a unique natural disturbance where lava flows into forests, leaving behi...

2010
Henry Adams

The fragmentation of forest ecosystems is common in the northeastern United States (Cadenasso, 1997). Many studies have focused on the biotic factors of forest edges. These have shown that edge vegetation is different compositionally and structurally from forest interior vegetation (Brothers, 1992; Luken, 1991; Matlack, 1993; 1994). Steeper climactic gradients are created when trees are removed...

2015
Rebecca Chaplin-Kramer Ivan Ramler Richard Sharp Nick M Haddad James S Gerber Paul C West Lisa Mandle Peder Engstrom Alessandro Baccini Sarah Sim Carina Mueller Henry King

Carbon stock estimates based on land cover type are critical for informing climate change assessment and landscape management, but field and theoretical evidence indicates that forest fragmentation reduces the amount of carbon stored at forest edges. Here, using remotely sensed pantropical biomass and land cover data sets, we estimate that biomass within the first 500 m of the forest edge is on...

2009

Much attention has been paid in recent years to the effect of habitat fragmentation on plant population genetics. Searching the ISI Web of Knowledge database using a combination of “fragmentation” and “genetic diversity” (or “gene flow”) and “plant*” (or “tree*”) I obtained 442 publications since 1992 (cited 7388 times), more than a half published after 2005. In 2008 some enlightening review pa...

Journal: :Floresta e Ambiente 2023

The Amazon Rainforest presents intense pressure from agricultural and cattle farming activities on its forest remnants, which promotes fragmentation. present study aimed to quantify structural changes in the landscape state of Tocantins, Brazil, that occurred between 1985 2020 using Mapbiomas data metrics. MAPBIOMS images were used delimit fragments size classes. Landscape metrics estimated Fra...

2001
John F. Lehmkuhl Leonard F. Ruggiero JOHN F. LEHMKUHL

Fragmentation is the creation of a complex mosaic of spatial and successional habitats from formerly contiguous habitat. Loss of habitat and the less obvious phenomenon of habitatpatch isolation are aspects ‘of fragmentation that threaten the viability of wildlife populations, the components of biotic diversity. Fragmentation of forests on Federal lands in the Pacific Northwest is the product o...

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