Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR, Chinese Academy of Surveying & Mapping, Beijing, 100036, China.
College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China.
Sci Rep. 2023 Aug 1;13(1):12488. doi: 10.1038/s41598-023-39761-8.
A systematic understanding of the spatio-temporal changes and driving factors in the Qinghai-Tibet Plateau holds significant scientific reference value for the future of ecological sustainable development. This paper utilizes MODIS normalized difference vegetation index (NDVI) and meteorological data to investigate the spatio-temporal changes and driving factors of vegetation coverage in the Qinghai-Tibet Plateau from 2001 to 2020. Methods employed include the dimidiate pixel model, trend analysis, partial correlation analysis, and residual analysis. The results demonstrate a generally fluctuating upward trend in vegetation coverage across the Tibetan Plateau over the past two decades, with spatial expansion occurring from northwest to southeast. Vegetation coverage exhibits a positive correlation with climate factors. Approximately 60.7% of the area showed a positive correlation between vegetation fractional cover (FVC) and precipitation, with 8.66% of the area demonstrating extremely significant (p < 0.05) and significant (p < 0.01) positive correlation. Human activities, on the whole, have contributed to the enhancement of vegetation cover in the Qinghai-Tibet Plateau. The areas where human activities have positively impacted vegetation cover are primarily situated in north-central Qinghai and north of Ngari, while areas experiencing degradation include certain grassland regions in central-eastern Yushu, Nagqu, and Lhasa.
系统地了解青藏高原时空变化及其驱动因素，对未来生态可持续发展具有重要的科学参考价值。本研究利用 MODIS 归一化植被指数（NDVI）和气象数据，研究了 2001 年至 2020 年青藏高原植被覆盖的时空变化及其驱动因素。研究方法包括二分像元模型、趋势分析、偏相关分析和残差分析。结果表明，在过去的二十年中，青藏高原的植被覆盖整体呈波动上升趋势，从西北向东南扩展。植被覆盖与气候因素呈正相关。约有 60.7%的地区植被分数覆盖（FVC）与降水呈正相关，其中 8.66%的地区呈极显著（p<0.05）和显著（p<0.01）正相关。人类活动总体上促进了青藏高原植被覆盖的增强。人类活动对植被覆盖产生积极影响的地区主要位于青海中北部和阿里北部，而退化的地区包括玉树、那曲和拉萨中部的一些草原地区。
