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The impact of cultivated land spatial shift on food crop production in China, 1990–2010
Land Degradation & Development ( IF 3.6 ) Pub Date : 2018-05-06 , DOI: 10.1002/ldr.2929 Yuanyuan Li 1, 2 , Xiubin Li 1, 2 , Minghong Tan 1, 3 , Xue Wang 1 , Liangjie Xin 1
Land Degradation & Development ( IF 3.6 ) Pub Date : 2018-05-06 , DOI: 10.1002/ldr.2929 Yuanyuan Li 1, 2 , Xiubin Li 1, 2 , Minghong Tan 1, 3 , Xue Wang 1 , Liangjie Xin 1
Affiliation
Cultivated land has been undergoing significant spatial shift during the last 2 decades in China, according to land‐use data derived from the Landsat Thematic Mapper. Based on soil organic matter data and yield data at county level, we developed a constant crop yield dataset at pixel level with a resolution of 1 km. Using this dataset, this paper quantitatively evaluates average crop yield change due to cultivated land spatial shift at national and regional levels. The results show that (a) at national level, the average crop yield per unit area decreased by 1.99% during the period 1990–2010. The main reason for this is that built‐up areas occupied a significant amount of high‐yield cultivated land whereas low‐yield land converted in ecologically vulnerable areas. (b) In spite of 77.2 thousand km2 cultivated land was converted to built‐up areas, especially in areas with high economic value, such as Huang–Huai–Hai Plain, 329.4 thousand km2 land was converted to cultivated land, especially in Northeastern and Northwestern China. (c) The quality gap between cultivated land converted to built‐up areas nationally and new cultivated land regionally suggests that the loss of 1 km2 of cultivated land converted to built‐up area would, to achieve equivalency, need to be compensated by 1.54 km2 of new land in Xinjiang, or more in Northeastern China. However, cultivated land expansion in these areas may cause land degradation and a series of ecological environment problems.
更新日期：2018-05-06
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