【摘要】 福建省耕地资源流失严重、质量下降 ,人口—耕地—粮食之间的矛盾十分突出。文中分析了福建省耕地面积对粮食生产贡献率随时间变化的特点 ,以及耕地退化对粮食生产影响状况。研究表明 ,耕地资源数量和质量的变化对粮食生产构成持久的约束作用 ,耕地资源稀缺已成为制约福建粮食安全的瓶颈。为了实现粮食安全 ,进口是必要的 ,但根本在于保持耕地数量平衡 ,防治耕地退化 ,立足全部国土 ,广辟非耕地食物资源 ,提高土地资源综合生产能力。更多还原

【Abstract】 Induced by the cultivated land resources decrease and degradation, there exit severe conflicts among population, cultivated land and food supply in Fujian Province. The main concerns of this paper are devoted to the contribution of the cultivated land to food productivity at different periods, and to the negative effects of cultivated land degradation on the potential increase of grain yield per hectare. Degradation of cultivated land, due to the soil erosion and pollution, tends to transform the high-yield land to the mid-yield and low-yield one, which will further restrict the food production and can be conceived as the bottleneck of food security in China. Granted, we can meet the food security through grain importing. The fundamental methods to solve these problems, however, are not only to maintain quantitative balance of cultivated land and to prevent the land from degradation, but also to exploit other food resources in non-cropland and to advance the comprehensive productivity of land resources.更多还原