中文摘要：

本研究从粮食需求和边际效益两个角度出发，对周口市进行耕地保护规模测算，结果如下：1）周口市2014年保障粮食需求的耕地规模为263645.84公顷，预计2020年会降到225634.75公顷；2）周口市土地效益最大化条件下的耕地保护规模为145758.60公顷；3）周口市2014年所拥有855175.25公顷耕地，远大于粮食需求和土地效益最大化条件下的耕地面积，耕地盈余规模为591529.41公顷；4）考虑到所承担的国家粮食安全任务，周口市耕地保护的最佳规模应不少于83万公顷。粮食主产区为国家粮食安全做出了巨大牺牲，建议从中央和地方两个层面来设计耕地保护补偿机制，满足其经济发展诉求。

英文摘要：

This study attempted to estimate the scale of cultivated land in Zhoukou City, which is based on the view of grain demand and marginal benefit, the results show that: 1) In the premise of food security in 2014 and 2020 , the need of cultivated land area is respectively 263645.84 hectares and 225634.75 hectares;2) The scale of cultivated land protection is 145758.60 hectares under the condition of maximum benefit;3) By contrast, the current number of cultivated land was far greater than the quantity under the conditionof grain demand and marginal benefit, and the surplus on cultivated land is 591529.41hectares in 2014; 4)Take account of the national food security tasks, the optimal size of farmland should be no less than 830,000hectares. Major grain producing area have made great sacrifices for the national food security. It is suggested that the compensation mechanism of cultivated land protection should be designed from two aspects of the central and local administrative,which serving the purpose of meeting area economic development demand.