Soil organic matter is a very important part of forest ecosystem productivity, and is also a very important tache of biological cycling in forest ecosystem.
土壤有机质为森林生态系统生产力构成的重要部分，是森林生态系统生物循环中的重要环节之一。
Irrational land use and forest cutting have resulted in the serious degradation, the decrease of land productivity and the water and soil erosion in the fragile soil system and forest system.
不合理的土地利用方式和对森林的不合理砍伐导致脆弱的土壤系统和森林生态系统的严重退化、生产力下降和严重的水土流失。
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.
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。
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