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Updated: Aug 6, 2026

Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach
Published on: July 3, 2020
[Analysis of Spatial and Temporal Variation Pattern and Driving Force of Vegetation Coverage in Xizang Region from
Hang Gong1, Guo-Dong Ding1,2,3,4, Hao Liu1
1School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
Abstract:
As the core area of the alpine ecological sensitive zone, Xizang's ecological barrier function is of strategic significance. Based on the remote sensing data of the normalized difference vegetation index (NDVI) from 2000 to 2022, the corresponding vegetation coverage (FVC) was inverted by using the pixel dichotomy method. Sen+Mann-Kendall trend analysis and multiple regression residual analysis were used to study the spatial and temporal variation characteristics of FVC in Xizang Autonomous Region from 2000 to 2022 and the corresponding contributions of its main driving factors (i.e., climate change and human activities). The results show that: ① From 2000 to 2022, the overall FVC in Xizang showed a fluctuating upward trend, with an upward rate of 0.009(10 a)-1, showing a gradient decreasing pattern of high in southeast and low in northwest. The overall improvement area (58.38%) was greater than the degradation area (23.81%). ② The area with very stable FVC change accounted for 18.81%, mainly concentrated in the area with high forest coverage, and the area with severe variation accounted for 38.71%, mainly located in the ecological environment sensitive area with low vegetation coverage. ③ The impacts of climate change and human activities on FVC change in Tibet had obvious spatial differentiation, but both of them were mainly positive. On the whole, the driving factors of FVC spatial change in the study area were as follows: the combined effect of climate change and human activities (63.31%) > human activities (23.79%) > climate change (12.91%). ④ Climate change and human activities contributed 54.92% and 62.26% to the increase in FVC in the study area, respectively, and the positive effect of human activities on FVC change was more obvious. The research results are of great significance to promote the integrated protection and systematic management of mountains, rivers, forests, fields, lakes, and sands in Xizang.
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