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Impact of Land Use/Cover Change on the Vegetation Carbon Storage in the Manas River Basin between 1976 and 2007
LIU Mei-ying,BAO An-ming,CHEN Xi,LIU Hai-long,ZHANG Hong-li,CHEN Xiao-na
JOURNAL OF NATURAL RESOURCES ›› 2010, Vol. 25 ›› Issue (6) : 926-938.
PDF(673 KB)
PDF(673 KB)
Impact of Land Use/Cover Change on the Vegetation Carbon Storage in the Manas River Basin between 1976 and 2007
Land use changes influence the distribution and structure of terrestrial ecosystems,and also change their carbon storage.One of the important performances in oasis process of arid area is that the natural vegetation degenerates, and the part of it was transformed into artificial vegetation and human communities. At present, the effect of LUCC on vegetation carbon storage mechanism is also not very clearly. According to the CASA model and by using the Landsat MSS/TM/ETM+ data separately acquired in 1976, 1989, 2000 and 2007, this paper estimates the net primary productivity of the Manas River basin. Furthermore, we used mortality model to estimate vegetation carbon densities. Then, we got different types of vegetation carbon storage. Finally, we analyzed the impact of transformation during different land use/cover classifications on the vegetation carbon storage, in the Manas River basin between 1976 and 2007. Also, we traced the land conversions in the period between 1976 and 2007 and analyzed the changes among cropland, forest, shrubbery, natural grassland, waste-grassland, settlement place and so on. The result showed that because of the change of planting structure and species,the density of vegetation carbon changed greatly. The vegetation carbon storage increased 50.50×104 t C from 1976 to 2007. Then we find that different land types can be transferred to each other. Based on the above data, we calculated the impacts of cropland, forest, shrubbery, natural grassland and wasteland conversions on the vegetation carbon storage. It is found out that the vegetation carbon storage decreased 1.21×104t C due to land degradation and unlawful and uncontrolled felling of forests of the study area. At the same time, we found out that because a large area of unused land has been reclaimed as cropland, afforestation and conceding the cropland to forest and grass, the vegetation carbon storage increased 18.52×104 t C . The result showed that the total vegetation carbon storage was an increased trend, and we found out that the main factor, which affects the vegetation carbon storage, was cropland.
land use/cover change / vegetation carbon storage / CASA model / the Manas River basin {{custom_keyword}} /
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