黄河源植被时空变化及其对地形和气候的响应

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Abstract Based on MODIS normalized differential vegetation index (NDVI) remote sensing data from 2000 to 2019, combined with temperature, precipitation and topographic data during the same period, this paper analyzed the spatiotemporal variation characteristics of vegetation and its response to topographic and climate change by maximum value synthesis, trend analysis and correlation analysis in the source region of the Yellow River. The results showed that:The NDVI of vegetation in the source region of the Yellow River was at a medium to high level, but the spatial difference was significant, showing a decreasing spatial distribution pattern from southeast to northwest. In the past 20years, the vegetation generally showed a trend of improvement. Vegetation had a significant response to elevation and slope. With the increase of elevation, the NDVI of vegetation first increased and then decreased, but there was no significant change in vegetation NDVI between 3500~4100m. In addition, the NDVI of vegetation first increased and then decreased with the increase of slope, and reached the maximum in the slope zone of 24 °~26°. The vegetation in the source region of the Yellow River was affected by both temperature and precipitation. Compared with precipitation, the influence of temperature on vegetation change was more significant.

Key words： vegetation variation MODIS data spatial analysis classical statistical analysis method the source region of the Yellow River

Received: 13 January 2021

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X826

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	Articles by authors
	QIN Qiao-ting
	CHEN Jian-jun
	YANG Yan-ping
	ZHAO Xiao-yu
	ZHOU Guo-qing
	YOU Hao-tian
	HAN Xiao-wen

Cite this article:

QIN Qiao-ting,CHEN Jian-jun,YANG Yan-ping等. Spatiotemporal variations of vegetation and its response to topography and climate in the source region of the Yellow River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3832-3841.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3832

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