黄土高原土壤水分环境地带性是气候地带性的作用结果并造成植被地带性。
The zonal soil moisture environment is the consequence of the zonal climate and causes the zonal vegetation.
因此，在以适地适树原则适应土壤水分环境的同时，应加强土壤水分环境的改善。
Therefore, more efforts should be laid on the improvement of soil water environment while following the principle of "selecting suitable tree species for sites" in planting.
集水造林通过增加植树带汇流量改善了林地土壤水分环境，从而影响到林分物质生产水平。
Afforestation by water-harvesting improves the soil water environment in forest owing to increase of runoff volume collected in the planting strip, so that the productivity of forests is influenced.
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