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生态学杂志 ›› 2023, Vol. 42 ›› Issue (11): 2665-2674.doi: 10.13292/j.1000-4890.202311.020

• 研究报告 • 上一篇    下一篇

青藏高原植被覆盖度时空变化特征及其驱动因素

郭建晓1,2,桑会勇1,2*,翟亮1,2


  

  1. 1中国测绘科学研究院自然资源调查监测研究中心, 北京 100036; 2自然资源部测绘科学与地球空间信息技术重点实验室, 北京 100036)

  • 出版日期:2023-11-10 发布日期:2023-10-30

Spatiotemporal variations and driving factors of vegetation coverage on the Qinghai-Tibet Plateau.

GUO Jianxiao1,2, SANG Huiyong1,2*, ZHAI Liang1,2   

  1. (1Research Center for Natural Resources Surveying and Monitoring, Chinese Academy of Surveying and Mapping, Beijing 100036, China; 2Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of Ministry of Natural Resources, Beijing 100036, China).

  • Online:2023-11-10 Published:2023-10-30

摘要: 系统掌握青藏高原植被覆盖度时空特征变化及驱动因素的影响,为生态可持续发展提供科学依据。本文利用2001—2020年MODIS-NDVI数据、地表温度数据、气象数据,采用像元二分模型、趋势分析、偏相关分析以及残差分析等方法,分析了青藏高原地区植被覆盖度时空变化特征及其与水热因子和人类活动的关系。结果表明:2001—2020年,青藏高原地区植被覆盖度总体呈波动上升趋势,空间上呈现由西北向东南阶梯状递增;植被覆盖度与气候因子呈一定程度的正相关性,降水与气温的作用呈现良好的互补性;植被覆盖与地表温度呈一定程度的负相关性,地表温度的升降幅度高于气温,热量因子中的气温更易成为限制植被生长的因素;人类活动对植被覆盖起到改善作用的区域主要分布于青海中北部地区、阿里地区北部,退化区域主要分布于玉树中东部地区的草地区域、那曲和拉萨等的部分地区。


关键词: 青藏高原, 植被覆盖度, 降水, 地温, 气温, 人类活动

Abstract: Systematically understanding the spatiotemporal variations of vegetation coverage and driving factors on the Qinghai-Tibet Plateau can provide scientific basis for ecological sustainable development. By integrating MODIS normalized difference vegetation index (NDVI), land surface temperature and meteorological data, we explored the spatiotemporal variations of vegetation coverage and the relationships with the factors of precipitation, temperature, and human activities on the Qinghai-Tibet Plateau from 2001 to 2020, using dimidiate pixel model, trend analysis, partial correlation analysis, and residual analysis. Vegetation coverage on the Tibetan Plateau showed a fluctuating upward trend from 2001 to 2020, and increased spatially from northwest to southeast. There were positive correlations between vegetation coverage and climate factors, with complementarity between the effects of precipitation and temperature. There was a negative correlation between vegetation cover and surface temperature. The rise and fall amplitudes of land surface temperature were higher than that of air temperature. Air temperature was more likely to be a factor limiting the growth of vegetation. The areas where human activities have improved vegetation cover were mainly located in north-central Qinghai and north of Ngari. The degraded areas included some grassland areas of central-eastern Yushu and parts of Nagqu and Lhasa.


Key words: Qinghai-Tibet Plateau, vegetation coverage, precipitation, land surface temperature, air temperature, human activity.