Abstract
Based on TM image data in 1989, 1995, 1999, 2003, 2006 and 2009 of Yanchi County of Ningxia, the land use data of Yanchi County in each year were extracted supporting by RS and GIS technology and the dynamic change of land use was analyzed. The change of ecosystem services values caused by the land use change of Yanchi County were estimated using the evaluation method of China terrestrial ecosystem services value. The results showed that the change of land use were significant from 1989 to 2009. The area of forest land and construction land had an increasing tendency, while grassland area first reduced and then increased; while cultivated land and unused land area first increased then reduced, while water area fluctuated slightly. The ecosystem services value of Yanchi County had an increasing tendency from 1989 to 1995, because the increasing forest land area had played the major role in raising the total ecosystem services value. The grassland accounted for a large proportion of the total ecosystem services value of Yanchi County, with its contribution rate from 49.8 to 60.4%. And the composition of the ecosystem services value of Yanchi County came up a benign change for the increasing contribution rate of woodland. The ecosystem services value sensitivity index of each land use type was less than 1, which indicated that the ecosystem services value of Yanchi County lacks flexibility on its service value index, research results were reliable.
Highlights
Ecosystem good and services represent the benefits human population derive, directly or indirectly, from ecosystem functions (Costanza et al, 1997), which are the material foundations and basic conditions for the survival and development of human being
Land use change: During the research period, the area of grassland was the largest and most distributed widely, the area of the water was the smallest, the cultivated land mainly distributed in the south and north, the distribution of forest land was disperse, the unused land mainly distributed in the north central of the area and decreased significantly as Table 3 and Fig. 1 shows
The change of cultivated land in the following stage from 1999 to 2009 mainly caused by the policy of returning the cultivated land to forest land or grassland that implemented by the government of China, the rapid development of agricultural technology and the wave of farmers getting into the factories, which all reduced the demand of cultivated land
Summary
Ecosystem good and services represent the benefits human population derive, directly or indirectly, from ecosystem functions (Costanza et al, 1997), which are the material foundations and basic conditions for the survival and development of human being. Drived by the natural and human factors, such as climate change, human activities, policy regulations, the land use change in Yanchi County is very significant, subsequently affect the ecosystem services. Acquisition of land use change data: Based on the six years remote sensing imagines of 1989, 1995, 1999, 2003, 2006 and 2009 and the topographic, geomorphologic, soil, vegetation maps and field survey data, according to the “land use investigation technology procedures” released by the National Agricultural Districts Committee of China in 1984, the land use type in Yanchi County can be classified into 6 categories: cultivated land, forest land, grassland, construction land, water area and unutilized land.
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