研究草原开垦对草原土壤及植被的扰动作用。
The disturbance ecological effect of reclamation on soil and vegetation of grasslands is studied in this paper.
禁止毁坏森林、草原开垦耕地，禁止围湖造田和侵占江河滩地。
It is forbidden to reclaim cultivated land by destroying forests or grasslands, to reclaim land from lakes and to encroach on tidal-flat areas of rivers.
在19世纪80年代，美国中部的高地平原大草原是由农民和牧场主开垦的。
The vast grasslands of the High Plains in the central United States were settled by farmers and ranchers in the 1880s.
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