Expansion of cropland area and formation of the eastern farming-pastoral ecotone in northern China during the twentieth century
文献类型：SCI/SSCI论文
| 作者 | Ye Y. |
| 发表日期 | 2012 |
| 关键词 | Land cover changes Historical cultivation Ecologically fragile area Cultivation ratio contours organic-carbon stocks |
| 英文摘要 | Land cover changes induced by historical cultivation in ecologically fragile areas involving important issues such as environmental change, ecology, and human sustainability are particularly worthy of attention. This paper reconstructs the spatial distribution of cultivated areas at the county level in the eastern farming-pastoral ecotone of northern China for four time periods during the twentieth century. The paper also analyzes how the location of cultivation ratio contours of 15 and 30 %, representing the boundaries of agricultural areas, have moved and the formation process of farming-pastoral ecotone patterns during this period. The study concludes that the area and ratio of cultivated land fluctuations increased during the twentieth century. The boundaries of the cultivation ratio contours of 15 and 30 % continually moved west and north. Moving north took priority over the other directions during the period of 1916-1940, when its center moved the farthest during the twentieth century, and the boundaries primarily moved westward during 1940-1980 and northwestward during 1980-2000. The distance, direction, and extent of the movement of the cultivation boundaries are all related to agricultural area expansion processes during this period, finally resulting in the creation of the modern farming-pastoral ecotone pattern. |
| 出处 | Regional Environmental Change |
| 卷 | 12 |
| 期 | 4 |
| 页 | 923-934 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1436-3798 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30701]  |
| 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.. Expansion of cropland area and formation of the eastern farming-pastoral ecotone in northern China during the twentieth century. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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