本文着重讨论了各种定量分析方法在耕地供给变化研究上的应用，包括驱动定量分析方法和空间分析方法，并给出了各种分析方法的应用实例。
This paper is concentrated on a series of quantitative methods when analyzing on cultivated land supply change, including driving quantitative methods and spatial analysis methods.
市场价格走高，将激发供给，从而激发生产；市场价格走低，可能引发矿厂检修、耕地改种其他作物。
A market price well above that level will cause new supply to be brought on stream; too low a price will cause mines to be mothballed or arable land to be switched to other crops.
此外，由于中国人口众多，耕地面积有限，为了保证全国农产品供给安全，必须保证现有的基本农田不受或少受侵犯。
Owing to large population and the limited cultivated land in our country, we must guarantee supply safety of the agricultural products and the existing basic farmland area.
供给方面，中国的粮食增长受到耕地和水资源约束；需求方面则受到收入增长和人口城市化的推动。
In China, the increase of grain is inhibited by the decreased arable land and water resources while the demands of grain are impulsed by the increased incomes and population urbanization.
在没有大量能源的密集供给时，耕地无法收获这样高产的粮食。
That land would not tolerate high yield crops without large quantities of energy-intensive inputs.
在2020年耕地的供给量远远超出需求量，可以认为是耕地得到有效保护的结果。
In 2020, there would be more supplement than requirement, and it is the result of cultivated land effective protection.
在2020年耕地的供给量远远超出需求量，可以认为是耕地得到有效保护的结果。
In 2020, there would be more supplement than requirement, and it is the result of cultivated land effective protection.
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