Spatial-temporal pattern of vegetation coverage and its climate driving mechanism in the Three Rivers Headwaters region from 2000—2022

doi:10.13474/j.cnki.11-2246.2024.1211

Abstract

Abstract: As an important ecological security barrier area in China, regional vegetation cover changes directly reflect the health of the ecosystem, so monitoring regional vegetation cover changes and analyzing their driving factors are conducive to realizing the sustainable development of the Three Rivers Headwaters region ecosystem. This study is based on the MODIS NDVI dataset from 2000 to 2022, combined with the mean annual temperature and mean annual precipitation data, and explores the spatial and temporal evolutionary characteristics of vegetation cover and its relationship with the climate driver during the last 23 years in the Three Rivers Headwaters region by using the image element dichotomy, Sen+Mann-Kendall trend analysis, and bias correlation coefficient analysis. Results show that: ①The vegetation cover of the Three Rivers Headwaters region show a high spatial distribution in the southeast and a low distribution pattern in the northwest. The vegetation cover show a significant linear growth trend from 2000 to 2022, with a growth rate of 0.001/a. ②Over the past 23 years, the vegetation cover of the Three Rivers Headwaters region has increased by 55.06% and decreased by 31.36%, with the increase in vegetation cover significantly higher than that of the decrease, and the overall vegetation cover is in the stage of gradual recovery.③The partial correlation analysis showe that the regional vegetation cover is positively correlated with the average annual temperature and average annual precipitation, with the correlation with the average annual temperature of 0.02 and the correlation with the average annual precipitation of 0.29, and precipitation is the main factor for the increase of vegetation cover. This study reveals the dynamic change and distribution pattern of vegetation cover in the Three Rivers Headwaters region over the past 23 years, which can provide a scientific basis for regional ecological protection and restoration.

Key words: Three Rivers Headwaters region, vegetation coverage, spatial and temporal variability patterns, precipitation, ecological protection and restoration

CLC Number:

P208

NING Xiaochun, YANG Mingxin, CAO Wenqiang, WANG Shouxing, GU Qiang, WANG Yanhe. Spatial-temporal pattern of vegetation coverage and its climate driving mechanism in the Three Rivers Headwaters region from 2000—2022[J]. Bulletin of Surveying and Mapping, 2024, 0(12): 70-76,83.

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