据估计，三分之一的可耕地为酸雨区，一些气候学家预测在长期范围内该国的粮食作物将出现减产。
By some estimates acid rain falls on a third of all agricultural land; some climate experts predict long-term reductions in the country's vital rice crop.
以农用分等成果为基础，探讨了不同等级耕地保有量预测方法。
Based on the achievements of farmland grading, predication method of different grading protection area of cultivated land is advanced.
利用GM（1，1）模型预测了菏泽地区的总人口和耕地面积，用拓扑预测模型预测了其粮食总产，并对三者进行了关联度分析。
The indices of the total population and cultivated land in Heze District is predicted by using the model of GM(1,1), and the total food output is forecasted based on the topological prediction model.
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