Spatiotemporal changes of vegetation greenness and their influencing factors in the Qinghai Lake Basin
Received date: 2025-04-14
Revised date: 2025-06-16
Online published: 2025-09-27
To investigate the spatiotemporal changes in vegetation greenness in the Qinghai Lake Basin and their responses to climate change and human activities, this study analyzed MODIS Normalized Difference Vegetation Index (NDVI) data and meteorological data from 2000 to 2023. Methods such as Sen+Mann-Kendall trend analysis, Hurst index, correlation analysis, and residual analysis were employed to examine the spatiotemporal patterns and future trends of vegetation greenness in the basin. The degree of influence of climate change and human activities on vegetation greenness was also assessed. The results show: (1) From 2000 to 2023, the annual average NDVI in the Qinghai Lake Basin was 0.45, with a significant increasing trend over time at a rate of 0.0022 per year. Areas showing improvement accounted for 86.2% of the study region, exhibiting a significant upward trend and distinct spatial heterogeneity. (2) Vegetation greenness generally remained relatively stable, with a coefficient of variation ranging from 0 to 1.7 and an average of 0.08, indicating a positive development trend. (3) Vegetation greenness in the Qinghai Lake Basin was positively correlated with both precipitation (r=0.196, P<0.05) and temperature (r=0.07, P<0.05), with precipitation having a stronger influence than temperature. Precipitation was the dominant driver in 85.5% of the area. (4) Changes in vegetation greenness in 63.6% of the Qinghai Lake Basin were jointly influenced by climate change and human activities, with human activities accounting for a relative contribution rate of 85.02%.
Mingyu Wang , Chengyong Wu , Kelong Chen . Spatiotemporal changes of vegetation greenness and their influencing factors in the Qinghai Lake Basin[J]. Journal of Desert Research, 2025 , 45(5) : 289 -300 . DOI: 10.7522/j.issn.1000-694X.2025.00126
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