| Temporal and spatial dynamic changes of land use and ecosystem service value in the Weigan River Basin in recent 20 years |
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| DOI：10.7606/j.issn.1000-7601.2013.02.39 |
| Key Words: ecosystem service value land use temporal and spatial change oasis Weigan River Basin |
| Author Name | Affiliation | | HUANG Feng | Xinjiang Institute of Ecology and Geography, CAS, Urumqi, Xinjiang 830011, China
Geographic Information Center of Urban-rural Planning Construction, Yibin, Sichuan 644000, China | | QIAO Xuning | School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003 China | | TANG Hong | Xinjiang Institute of Ecology and Geography, CAS, Urumqi, Xinjiang 830011, China |
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| Abstract: |
| Based on GIS-RS techniques, by using the data of land use in Xinjiang during 1990 to 2008 which were extracted from remote sensing images by means of spatial analyst, and taking the Weigan River Basin located at the south foothill of middle Tianshan Mountains and the northern part of Tarim Basin as the study region, the area change and net change rate of various land use types in recent 20a were analyzed. By adopting the service value coefficient
s of Chinese terrestrial ecosystems proposed by Xie Gao-di, and the calculation formula of ecosystem service value proposed by Costanza, in combination with the local grain yield and grain purchasing price, the temporal and spatial dynamic changes of ecosystem service value in Weigan River Basin were studied, so as to reveal the imbalance situation in the spatial and temporal distribution of ecosystem service value in Weigan River Basin, and to provide scientific basis for land use planning and decision making. The results show that: (1) The grassland and unused land covered more than 70％, and the other land use types covered less than 20% in Weigan River Basin. There were spatial and temporal differences in the area distribution and change of various land use types. (2) During 1990 to 2008, the total value of ecosystem services in the study region was reduced by 596.33 million yuan. The main reason for the reduction was the area decrease of forest, marsh and grassland. The structure of ecosystem service values changed greatly and its function of supporting services was the strongest, while its function of supplying services was relatively low. (3) The value of ecosystem services per unit area in the downstream was more than that in the upstream and midstream. During 1990 to 2008, the value of ecosystem services in the midstream and downstream reduced remarkably, while that of the upstream increased slightly. |
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