Spatiotemporal evolution and attribution of vegetation coverage in the peak - cluster depression basins
WANG Dong-hua1,2, TIAN Yi-chao1,2,3, ZHANG Ya-li2, HUANG Liang-liang1, ZHANG Qiang2, TAO Jin2, YANG Yong-wei2, LIN Jun-liang2
1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; 2. School of Resources and Environment, Beibu Gulf University, Qinzhou 535011, China; 3. Key Laboratory of Marine Geographic Information Resources Development and Utilization in the Beibu Gulf, Beibu Gulf University, Qinzhou 535011, China
Abstract：In this paper, the pixel dichotomy model, coupled with the Theil-Sen Median trend, Mann-Kendall test and Hurst index, is used to characterize the vegetation coverage in the peak-cluster depression basins in Southwest Guangxi from 2000 to 2020, and finally the Geodetector is applied to quantify the driving factors. The results show that: (1) Interannual variations in vegetation cover in the basin demonstrate an increasing trend over the 21-year period, with an overall growth rate of 0.6754a-1(0.774a-1 in karst areas and 0.5751a-1 in non-karst areas); (2) There is a pattern of "high in the north and low in the east", in which 82.68% of the study area have a significant increase and only 0.61% show a significant decrease; (3) The Hurst index of regional vegetation coverage trends to be between 0~1, with an average value of 0.8207, showing a single peak deviation to the right and a trend of continuous improvement in the future; (4) In terms of driving mechanism, land use/cover (LULC) is the dominant factor of vegetation coverage in the whole study area; all drivers showed significant interactions on the spatial distribution of vegetation coverage, among which the interaction between LULC and population density (pop) was the strongest.
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