“集土梯田”是土石山区特定地貌类型的产物，是一项具体的水土保持工程措施。
The soil gathered terraced fields, as the result of special mountain area landforms composing of earth and stone, are a specific measure of water and soil conservation.
在以北京土石山区为代表的粗砂多砂区，传统的搅拌方法无法测得准确的含沙量。
However in some rocky and earthy regions such as Beijing mountain region, traditional measurement method can not get the precise value of sediment concentration.
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