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中文摘要：
用省的数据，现在的纸在农业和环境上检验栽培陆地变换的影响。谷物生产中心逐渐地向易碎的更多正在移动并且浇少见的区域，这被发现，施加环境上的更多的压力。在 1990 年代在生态系统服务值引起大损失的陆地变换，而是大规模自从 2000，生态的恢复程序被实现了补偿如此的损失。生态的恢复节目与相对低的陆地生产率在区域被集中，而栽培陆地变换通常与相对高的陆地生产率发生在区域。最新栽培的土地，特别在边际地为农业生产在区域适合，比原版栽培土地是可能的有低得多的生产率层次。因为潜在地可耕种的土地的股票是几乎精疲力尽的，中国的谷物自足政策能被保存可耕地的可得到的股票并且以一个持续方法增加它的生产率仅仅维持。
英文摘要：
Using provincial data, the present paper examines the impact of cultivated land conversion on agriculture and the environment. It is found that the grain production center is gradually moving towards more fragile and water scarce areas, putting more pressure on the environment. Land conversion caused large losses in ecosystem service values in the 1990s, but large scale ecological restoration programs have been implemented since 2000 to compensate for such losses. The ecological restoration programs are concentrated in regions with relatively low land productivity, whereas cultivated land conversion usually takes place in areas with relatively high land productivity. Newly-cultivated land, especially that in areas marginally suit for agricultural production, is likely to have much lower productivity levels than the original cultivated land. Because the stock of potentially cultivable land is almost exhausted, China＇s grain self-suffiency policy can only be maintained by preserving the available stock of arable land and increasing its productivity in a sustainable way.
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Regional differences and characteristics of soil organic carbon density between dry land and paddy f
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