精河流域绿洲土地利用及生态系统服务价值时空变化研究

doi:10.19741/j.issn.1673-4831.2020.0958

Abstract

Abstract: Land use change can directly affect ecosystem service function and ecological security. The quantitative evaluation of the eco-environmental effects of land use change at the county level can provide a scientific basis for the rational development and utilization of water and soil resources in the oasis of Jinghe River Basin. Three phases of images in 1990 (encouraging land reclamation), 2000 (implementing ecological protection) and 2018 (after implementing ecological protection) were used to calculate the land use types and introduce the method of echelon ring to analyze the ecosystem services value. Furthermore, the eco-environmental effects of land use change were identified by using the eco-environmental quality index and the ecological contribution rate. Results show that:(1) From 1990 to 2018, the land use in the study area changed significantly. The total area of construction land, cultivated land, water area and grassland increased while the total area of woodland and unused land decreased; (2) In the past 28 years, the ecosystem services value in the study area has changed greatly. The trend was to be decreased first and then increased. The overall ecosystem services value in 2018 is better than that in 1990 and 2000. Based on constructing a gradient loop which took the city as the center, the spatial characteristics of ecosystem service value were analyzed. Results indicate that the ecosystem services value of the southern parts of the study area was higher than the northern parts, and the high value appeared in S5-S7 echelon ring in 1990 and 2000. While in 2018 the ecosystem services value of the northern parts of the study area was higher than the southern parts, and the high value appeared in N6-N8 echelon ring (48-64 km); (3) The eco-environmental quality index of 1990, 2000 and 2018 were 0.147, 0.120 and 0.194, respectively. The main reasons for eco-environmental degradation were land desertification and the transformation of forest and grassland into unused land, and the main causes for the improvement of eco-environment quality were the transformation of land use from unused land into forest and grassland and the restoration of Ebinur Lake.

Key words: land use, ecosystem service value, eco-environmental effect, Jinghe River Basin

CLC Number:

WU Zhao-peng, ZHANG Jin-yan, WANG Juan-juan, Lü Si-yu, LI Bin-cai. Study on the Spatio-temporal Changes of Oasis Land Use and Ecosystem Service Value in Jinghe River Basin[J]. Journal of Ecology and Rural Environment, 2021, 37(9): 1168-1175.

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Study on the Spatio-temporal Changes of Oasis Land Use and Ecosystem Service Value in Jinghe River Basin

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