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	Cropland cover change in Northeast China during the past 300 years
	Ye Y.
	2009
关键词	past 300 years Northeast China cropland land cover environmental change global land-use climate
英文摘要	Land use/cover change induced by human activities has emerged as a "global" phenomenon with Earth system consequences. Northeast China is an area where the largest land cultivation activities by migrants have happened in China during the past 300 years. In this paper, methods including documentary data calibration and multi-sourced data conversion model are used to reconstruct historical cropland cover change in Northeast China during the past 300 years. It is concluded that human beings have remarkably changed the natural landscape of the region by land cultivation in the past 300 years. Cropland area has increased almost exponentially during the past 300 years, especially during the past 100 years when the ratio of cropland cover changed from 10% to 20%. Until the middle of the 19th century, the agricultural area was still mainly restricted in Liaoning Province. From the late 19th century to the early 20th century, dramatic changes took place when the northern boundary of cultivation had extended to the middle of Heilongjiang Province. During the 20th century, three agricultural regions with high ratio of cropland cover were formed after the two phases of spatial expansion of cropland area in 1900s-1930s and 1950s-1980s. Since 1930s-1940s, the expansion of new cultivated area have invaded the forest lands especially in Jilin and Heilongjiang Provinces.
出处	Science in China Series D-Earth Sciences
卷	52
期	8
页	1172-1182
收录类别	SCI
语种	英语
ISSN号	1006-9313
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22544]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Ye Y.. Cropland cover change in Northeast China during the past 300 years. 2009.

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