1990~2015年东北地区草地变化遥感监测研究

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Abstract Northeast China is located in the eastern section of the agro-pastoral ecotone in the northern grassland. It is a typical ecologically fragile zone, sensitive to human disturbance and climate change. Based on the grassland datasets in Northeast China in 1990 and 2015, grassland dynamics model, grassland change degree comprehensive index, grassland relative change rate, area-weight centroid model and landscape index were used as reference indicators to analyze the Spatio-temporal dynamics and their driving factors of grasslands. The results showed that the grassland area in Northeast China decreased by 9,755.94km² during 1990 and 2015, among which the Eastern Inner Mongolia Autonomous Region had the largest reduction; the grassland dynamic degree, the change degree comprehensive index and the relative change rate of the Heilongjiang Province were the highest, namely -30.67%, 21.68% and 5.55, respectively, and the grassland had the most dramatic changes and the worst stability. The corresponding three indicators in the Eastern Inner Mongolia Autonomous Region were the lowest, namely -3.76%, 2.66% and 0.68, respectively, with the highest average annual change intensity of 0.0193%, which was more stable than other provinces, but its reduction was the largest. The grassland area-weight centroid moved 11.28km to the southwest in Northeast China, which was caused by the huge difference in grassland dynamic intensity between the Heilongjiang Province and the Eastern Inner Mongolia Autonomous Region. The fragmentation of grassland in Northeast China has decreased, the stability of landscape types has increased, and the shape of patches tended to be regular, mainly due to the conversion of small patches and fragmentized patches into other land-cover types. Climate warming and drying were the natural driving factors for grassland degradation. Increasing population and economic growth had indirectly affected grassland changes, and livestock growth was an important factor for grassland degradation.

Key words： dynamics model relative change rate area-weight centroid model landscape pattern driving factor

Received: 14 October 2019

PACS:	X171
	X87
	TP79
	S812.8

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	Articles by authors
	MAN Wei-dong
	LIU Ming-yue
	WANG Zong-ming
	HAO Yu-feng
	XIANG Heng-xing
	WEI Si-yi
	MAO De-hua
	JIA Ming-ming
	REN Chun-ying

Cite this article:

MAN Wei-dong,LIU Ming-yue,WANG Zong-ming等. Remote sensing investigation of grassland change in Northeast China during 1990~2015[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2246-2253.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I5/2246

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