在美国北部的大平原上,由于较粗放的露天采矿,造成了必须将大量的表土回填到原来区域的问题,而且回填过程中覆盖表土的厚度和地面覆盖的方法,对植被恢复有着较大的影响。为了确定最适宜植被生长的覆盖表土厚度和地面覆盖方法,有关科研人员对此进行了试验和研究。 On the Great Plains in the northern United States, the problem of having to repackage a large amount of topsoil to the original area due to the more extensive open pit mining and the method of covering the thickness of the topsoil and the ground cover during the backfill has a greater influences. In order to determine the most appropriate vegetation cover the thickness of topsoil and ground cover methods, the researchers have carried out experiments and research.