Cropland cover change in Northeast China during the past 300 years |
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| Authors: | Yu Ye XiuQi Fang YuYu Ren XueZhen Zhang Li Chen |
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| Institution: | (1) School of Geography, Beijing Normal University, Beijing, 100875, China;(2) Institute of Geographical Science and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China;(3) Harbin Meteorological Bureau, Harbin, 150080, China |
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| Abstract: | 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.
Supported by National Natural Science Foundation of China (Grant No. 40571165) and Innovation Foundation of Chinese Academy
of Sciences (Grant No. KZCX2-YW-315) |
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| Keywords: | past 300 years Northeast China cropland land cover environmental change |
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