نتایج جستجو برای: forest and ranch coverage
تعداد نتایج: 16857886 فیلتر نتایج به سال:
www.frontiersinecology.org © The Ecological Society of America F an airplane, we often look out the window and survey the landscape as we begin our final descent. As we get closer to the ground, our focus changes from an initial broad survey of the topography to an increasingly detailed picture of vegetation patterns. Perhaps the first thing we notice is the extent to which the land is covered ...
1.1 Urban forestry in the United States: Status and scope The United States has observed unprecedented urban growth over the last few decades. Nowak et al. (2005) noted that between 1990 and 2000, the share of urban land area in the nation increased from 2.5% to 3.1%. Existing urban areas in the U.S. maintain average tree coverage of 27% (Nowak et al. 2001), and consist of millions of trees alo...
The project focuses on examining the advantages of random verification with real examples. Random verification has two necessary parts, hierarchical testbench and coverage metrics. The layered testbench allows a verifier to improve the coverage by only modifying the randomization constraints at the highest level of abstraction. Although it might take a verifier more time to build such hierarchi...
Spatial and temporal patterns of carbon (C) storage in forest ecosystems significantly affect the terrestrial C budget, but such patterns are unclear in the forests in Hainan Province, the largest tropical island in China. Here, we estimated the spatial and temporal patterns of C storage from 1993-2008 in Hainan's forest ecosystems by combining our measured data with four consecutive national f...
Soil organic carbon pool plays an important role in the global C cycle and climate change mitigation. Therefore, improving our understanding of some factors such as plant biodiversity that can affect forest soil C storage is fundamentally important for anticipating changes. This study was carried out in the mixed-beech forests of Glandrood located in Noor using a systematic network of points in...
We studied cancer prevalence and exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (dioxin) in veterans of Operation Ranch Hand, the Air Force unit responsible for the aerial spraying of herbicides in Vietnam from 1962 to 1971. A comparison group of Air Force veterans who served in Southeast Asia during the same period and who were not involved with spraying herbicides was included. Comparison ve...
Aboveground biomass (AGB) of forests is an essential component of the global carbon cycle. Mapping above-ground biomass is important for estimating CO2 emissions, and planning and monitoring of forests and ecosystem productivity. Remote sensing provides wide observations to monitor forest coverage, the Landsat 8 mission provides valuable opportunities for quantifying the distribution of above-g...
forest roads are directions in natural habitats that used to transport wood products, secondary forest products and recreation. constructing forest roads causes trees clearing with specified width thus lead to direct or indirect changes in forest ecosystems and forest environment. this study aims to assess the changes of diversity and richness indices in main and secondary forest roads in a par...
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