基于Google Earth Engine分析黄土高原植被覆盖变化及原因

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Abstract Based on Google Earth Engine, this study conducted a quantitative analysis for the spatiotemporal variation of vegetation coverage from 1987 to 2015 on the Loess Plateau using Landsat Surface Reflectance data, and the method of slope change ratio of cumulative quantity was used to evaluate the relative contributions of climate change and human activities to it. The results revealed that:the annual vegetation coverage significantly increased from 41.78% in 1987 to 53.23% in 2015 (P<0.05), especially after the implementation of the Grain for Green Program (2000~2015) with a significant increase of 0.59%/a (P<0.05). However, no significant change was observed for the vegetation coverage during 1987~1999 (P>0.05). At a pixel scale, about 72.93% of the research area showed an increasing vegetation coverage and 38.31% of the research area had a significant increase in vegetation coverage (P<0.05). Vegetation coverage changes was affected by both climate and human factors. Taking 1987~1999 as reference period, the relative contributions of climate change and human activities to vegetation coverage changes were 23.77% and 76.23% during 2000~2015, respectively. Therefore, human activities were the dominant factors for vegetation coverage changes on the Loess Plateau. The Grain for Green Program has greatly improved the vegetation status on the Loess Plateau, but the expansion of city has caused significant degradation of vegetation coverage in some areas.

Key words： vegetation coverage spatiotemporal variation reasons Google Earth Engine Loess Plateau

Received: 10 April 2019

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X173

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	Articles by authors
	GUO Yong-qiang
	WANG Nai-jiang
	CHU Xiao-sheng
	LI Cheng
	LUO Xiao-qi
	FENG Hao

Cite this article:

GUO Yong-qiang,WANG Nai-jiang,CHU Xiao-sheng等. Analyzing vegetation coverage changes and its reasons on the Loess Plateau based on Google Earth Engine[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4804-4811.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4804

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