本文通过一个试验实例，阐明利用地形图分析土地利用状况的方法。
The thesis elaborates the method of using topographic map in land use analysis by applying an example of experiment.
根据上述地图和你已有地理知识，解释为什么两地区的土地利用状况是这样的。
Based on the maps and your knowledge of geography, explain why land is used the way it is in each of the regions.
随着土壤流失程度的增大，流域不同土地利用状况下的A层土壤颗粒粒径分选系数降低。
With the increasing of soil loss, the sorting coefficient for soil particle diameter of a layer decrease in different types of land utilization.
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