نتایج جستجو برای: forest fragmentation

تعداد نتایج: 139402  

Journal: :international journal of environmental research 2012
e. salehi l. zebardast a.r. yavri

fragmentation, or breaking apart of habitats, is one of the major causes of decline in biological diversity. mature ecosystems, especially dense forests are very sensitive to this phenomenon and roads are one of the major causes of fragmentation in forest landscapes. present investigation aims to trace landscape fragmentation in dense forests of golestan national park in northeast of iran betw...

In the current study, conservation strategies were employed for the spatial analysis of forest fragmentation and field assessment approaches in a forest landscape of Central Zagros, in the western part of Isfahan province, Iran. Vegetation and soil properties were accordingly studied in 15 forest sites with various densities including dense, semi-sparse and sparse-forests with 839.2 km2. In the...

Journal: :international journal of environmental research 0
e. salehi graduate faculty of environment, university of tehran, p.o.box 14135-6135, tehran, iran l. zebardast graduate faculty of environment, university of tehran, p.o.box 14135-6135, tehran, iran a.r. yavri graduate faculty of environment, university of tehran, p.o.box 14135-6135, tehran, iran

fragmentation, or breaking apart of habitats, is one of the major causes of decline in biological diversity. mature ecosystems, especially dense forests are very sensitive to this phenomenon and roads are one of the major causes of fragmentation in forest landscapes. present investigation aims to trace landscape fragmentation in dense forests of golestan national park in northeast of iran betwe...

2007
M. Kurtis Trzcinski Lenore Fahrig Gray Merriam

The aims o f this study were ( 1 ) to determine the relative importance o f the independent effects o f forest cover and fragmentation on the distribution o f forest breeding birds, and ( 2 ) to test the hypothesis that the negative ef fect o f forest fragmentation on species distribution increases with decreasing forest cover, i.e., the negative interaction ef fect o f forest cover and fragmen...

2015
Marta Rueda Juan Carlos Moreno Saiz Ignacio Morales-Castilla Fabio S. Albuquerque Mila Ferrero Miguel Á. Rodríguez

Ecological theory predicts that fragmentation aggravates the effects of habitat loss, yet empirical results show mixed evidences, which fail to support the theory instead reinforcing the primary importance of habitat loss. Fragmentation hypotheses have received much attention due to their potential implications for biodiversity conservation, however, animal studies have traditionally been their...

2016
Elizabeth Clay Rafael Moreno-Sanchez Juan Manuel Torres-Rojo Francisco Moreno-Sanchez

Landscape modification and habitat fragmentation are key drivers of global species and biodiversity loss, as well as a major threat to the conservation of forest ecosystems. Mexico is one of the five biologically richest countries in the world. This study first generated a national level assessment of the fragmentation of temperate and tropical forests in Mexico for 2002, 2008, and 2013. Then, ...

2017
Lei Zhang Yanfang Liu Xiaojian Wei

Forest fragmentation, the process of changing original large and intact forest patches into smaller and isolated areas, significantly influences the balance of surface physical environment, biodiversity, and species richness. Sufficient knowledge of forest fragmentation is necessary to maintain ecological balance and promote sustainable resource utilization. This study combines remote sensing, ...

2011
Kurt H. Riitters John W. Coulston James D. Wickham

Forest fragmentation threatens the sustainability of forest communities in the eastern United States. Forest communities exhibiting either a low total area or low percentage of intact forest are subject to relatively higher risk of shifts in stand composition towards edge-adapted and invasive species. Such changes in stand composition could result in local extirpation of communities, homogeniza...

2014
Qiong Gao Mei Yu

Despite the overall trend of worldwide deforestation over recent decades, reforestation has also been found and is expected in developing countries undergoing fast urbanization and agriculture abandonment. The consequences of reforestation on landscape patterns are seldom addressed in the literature, despite their importance in evaluating biodiversity and ecosystem functions. By analyzing long-...

Journal: :Remote Sensing 2017
Weiqi Zhou Sai Zhang Wenjuan Yu Jing Wang Weimin Wang

Urban expansion has significant effects on forest loss and fragmentation. Previous studies mostly focused on how the amount of developed land affected forest loss and fragmentation, but neglected the impacts of its spatial pattern. This paper examines the effects of both the amount and spatial pattern of urban expansion on forest loss and fragmentation. We conducted a comparison study in the si...

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