因此，展开耕地资源变化的研究具有重要的理论意义和实践意义。
Therefore, it is significant to study the change of cultivated land in both theory and practice.
通过引入耕地面积相对变化率计算分析了张掖绿洲各区县耕地资源变化的区域差异。
By calculating the relative change ratio of the cultivated land, the author analyzes the difference of the cultivated land changes in the different sections of Zhangye Oasis.
在遥感和GIS技术的支持下，分析了东北黑土区1986 ~ 2000年耕地资源变化特征与空间格局。
Based on RS and GIS, the cropland change characteristics and spatial pattern in black soil zone of Northeast China from 1986 to 2000 were analyzed.
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