Land Use Change and Eco-security Assessment of Huangfuchuan Watershed
Received date: 2005-10-28
Revised date: 2006-01-23
Online published: 2006-06-25
Supported by
National Natural Science Foundation of China, No.30370625; Program for New Century Excellent Talents in University No.NCET-04-0149
Supported by "3S" technology, this paper analyses land use change in Huangfuchuan Watershed from 1987 to 2000, conducts a synthetic eco-security assessment on the watershed by multiplication algorithm model on the pixel scale, and discusses the relationship between different land use patterns and eco-security of watershed. The results showed: (1) In recent 10 years, the general tendency of land use change in the study area was that the proportion of urban land, woodland, cropland and shrub increased constantly and that of water area, grassland, sandy land and bare rock decreased gradually. During this period, the watershed land use pattern was under the tremendous pressure from the conflict between the rapid urbanization, economic development and the conservation and rehabilitation of eco-environment. The distinct decline of water area is the bottleneck of this contradiction. (2) From 1987 to 2000, the average synthetical eco-security index rose from 6.033 to 6.506. It is sure that the eco-environment of the whole watershed has been improved. However, eco-environment in some areas even went worse despite of large-scale comprehensive harnessment. (3) In Huangfuchuan Watershed, most of the sandy and soft rocky lands are in a moderate-warning or serious-warning state of eco-security, and the rest of the land use types basically in a light-warning state of eco-security. (4) Land use types are closely correlated with eco-security. The order of eco-security index is: shrub > woodland > grassland > cropland > sand > soft rock, which indicates that measures taken based on woodland and shrub are the priority and important means for ecological restoration of the watershed. Furthermore, the sandy land and bare rocky land are the key problems of comprehensive harnessment of the watershed, which could not be overlooked. Generally, this paper emphasized the impacts of different land use types and patterns on eco-security of watershed and put forward suggestions concerning the adjustment or optimization of land use pattern and improvement of the technical system for eco-security assessment based on simulation and prediction of land use change, which would have wide application prospectives in the future.
Key words： Huangfuchuan Watershed; land use change; eco-security assessment
YU Feng, LI Xiaobing, WANG Hong, YU Hongjing . Land Use Change and Eco-security Assessment of Huangfuchuan Watershed[J]. Acta Geographica Sinica, 2006 , 61(6) : 645 -653 . DOI: 10.11821/xb200606008
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