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[1]HU Haitao,CHANG Yifei,WANG Kaibo.Multi-Scale Analysis of Spatiotemporal Change of Vegetation Cover in Shaanxi Province from 2000 to 2020[J].Research of Soil and Water Conservation,2023,30(03):345-352.[doi:10.13869/j.cnki.rswc.2023.03.048]

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Multi-Scale Analysis of Spatiotemporal Change of Vegetation Cover in Shaanxi Province from 2000 to 2020

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 345-352 Column: Public date: 2023-04-10

Title:: Multi-Scale Analysis of Spatiotemporal Change of Vegetation Cover in Shaanxi Province from 2000 to 2020

Author(s):: HU Haitao¹, CHANG Yifei², WANG Kaibo³; (1.Shaanxi Forestry Survey and Planning Institute, Xi'an 710082, China; 2.Shaanxi Water Conservancy and Electric Power Survey and Design Institute, Xi'an 710001, China; 3.Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China)

Keywords:: vegetation coverage; dimidiate pixel model; multi-scale; spatiotemporal change; Grain for Green Project

CLC:: Q948.1

DOI:: 10.13869/j.cnki.rswc.2023.03.048

Abstract:: [Objective]Since the Grain for Green Project was implemented, the vegetation coverage in Shaanxi Province has been improved significantly. However, the increase of vegetation cover at the provincial scale conceals the fact that the vegetation cover decreases in some cities and counties. Thus, there is an urgent need to strengthen the study of vegetation cover change and its driving factors in different spatial scales. [Methods] The vegetation coverage of Shaanxi Province from 2000 to 2020 was calculated based on the MODIS NDVI data, and the spatiotemporal change trend of vegetation coverage in different spatial scales was analyzed. [Results] The average vegetation coverage of Shaanxi Province was 64.3%±2.1% and the annual growth rate was 0.24%, the average vegetation coverage of northern Shaanxi was 37.6%±4.4% with the annual growth rate of 0.63%, and the average vegetation coverage of southern Shaanxi was 89.6%±1.2% with the annual growth rate of 0.13%, the average vegetation coverage in middle Shaanxi was 70.6%±3.5% with the annual decline rate of -0.18% from 2000 to 2020. The vegetation coverage of Yan'an, Yulin, Tongchuan, Baoji, Ankang and Shangluo continued to increase, while the vegetation coverage of Xi'an, Weinan, Xianyang and Hanzhong increased first and then decreased from 2000 to 2020. In the whole province, vegetation coverage in 72.3% of the districts and counties showed an increasing trend, and changes of vegetation coverage in 22.3% of the districts and counties showed the opposite direction. The growth rate of vegetation coverage in Shaanxi Province was higher in 2000—2010 than that in 2010—2020 at different spatial scales, which could be attributed to the difference of afforestation area in the two periods. [Conclusion] The change of vegetation cover in Shaanxi Province is dependent on spatial scale. The accurate understanding of the change of vegetation cover at different scales is helpful to scientifically evaluate the effectiveness of regional ecological construction.

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Last Update: 2023-04-10