2000—2022年三江源植被覆盖度时空变化格局及其气候驱动机制

doi:10.13474/j.cnki.11-2246.2024.1211

摘要/Abstract

摘要： 三江源作为我国重要的生态安全屏障区,区域植被覆盖度的变化直接反映生态系统的健康状况,因此,监测区域植被覆盖变化并分析其驱动因素,有利于实现三江源生态环境的可持续发展。本文基于2000—2022年MODIS NDVI数据集,结合年均气温和年均降水数据,利用像元二分法、Sen+Mann-Kendall趋势分析法和偏相关系数分析法,探讨了三江源近23年间植被覆盖度时空演变特征及其与气候驱动的关系。结果表明:①三江源植被覆盖度在空间分布上表现为东南高、西北低的分布格局,2000—2022年三江源植被覆盖度呈线性增长趋势显著,增长率为0.001/a;②23年来三江源植被覆盖度增加区域为55.06%,减少区域为31.36%,植被覆盖度增加区域明显高于减少区域,总体植被覆盖度处于逐渐恢复的阶段;③偏相关分析表明,区域植被覆盖度与年均气温、年均降水均呈正相关性,与年均气温的相关性为0.02,与年均降水的相关性为0.29,降水为区域植被覆盖度增加的主要因素。本文研究揭示了23年来三江源植被覆盖度动态变化和分布格局,可为区域生态保护修复提供科学依据。

关键词: 三江源, 植被覆盖度, 时空变化格局, 降水, 生态保护修复

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

中图分类号:

P208

宁晓春, 杨明新, 曹文强, 王守兴, 谷强, 王雁鹤. 2000—2022年三江源植被覆盖度时空变化格局及其气候驱动机制[J]. 测绘通报, 2024, 0(12): 70-76,83.

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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