Impact Assessment of Land Use on Eco-Environment Vulnerability in Subtropical Mountainous Region
Land use greatly influences the eco-environment vulnerability, especially in the eco-environment vulnerable mountainous regions. In order to ascertain the influence degree and characteristic of the spatial distribution of land use impact on eco-environment vulnerability, a subtropical mountainous region, Lancang county of Yunnan Province in southwest China was selected as the study area. Five primary indexes and fourteen secondary indexes were established, whose weight were decided by the analytic hierarchy process (AHP). With spatial information processing technology of Geography Information System (GIS), land ecological vulnerability (LEV) model is used to assess the impacts of land use on eco-environment vulnerability, and spatial distribution properties were approached from multiple dimensions. Meanwhile, feasible countermeasures for eco-environment conservation are put forward for future rational land use and eco-environment conservation in mountainous region. The analytical results show that: (l) it is feasible to analyze LEV by choosing comprehensive indexes such as state of land use(SELU), environment of land use(ELU), stability of land use(SYLU), spatial pattern of land use(SPLU) and population indices(PI); (2) the land of study area is categorized into four types according to the inflection points of the frequency sequence chart created from the scores of LEV, namely most vulnerable, more vulnerable, vulnerable and potentially vulnerable. Potentially vulnerable type is the dominant one which covers 59.62％ of the whole study area, which covers 79.66％ of the whole watershed, and the others types cover 40.38％ of the whole study area. It explains that land use has impacted on eco-environment vulnerability; (3) in terms of county scale, LEV shows an increasing trend from the southern part to the north part, while the western and eastern part are more vulnerable as compared to the central and southern part; (4) in terms of township scale, of all 20 towns, 5 are classified as key protection areas where most and more vulnerable types all make up over 25％ of the total each town, and merely 4 enjoy relatively good environment where potentially vulnerable type makes up over 80％ of the total each town.
land use ecological vulnerability LEV model mountainous region
Xiaoqing Zhao Xulan Yin Shucheng Tan
College of Resource Environment and Earth Science, Yunnan University, Kunming, Yunnan 650091, China
国际会议
西安
英文
445-450
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）