黄土高原土壤水分与水土保持措施相互作用

土壤水是重要的生态水源和水文要素之一,黄土高原位于干旱半干旱地区,降水量的年际变化大和季节分配极不均匀,土壤水资源对植物生长发育的影响尤为重要。同时,土壤水的数量及其分布也受人类活动影响。水土保持措施是黄土高原人类改造下垫面过程之一,这种改造会影响土壤水分的静态分布和动态过程。水土保持坡面工程措施能有效地提高土壤含水率。深根系人工林草植被使土壤含水率降低,甚至造成利用性土壤干层,影响人工植被的永续发展。尽管天然植被也有较高的生产力水平,但并未引起土壤水分状况的恶化,这是黄土高原植被营造及规划中值得注意和进一步研究的问题

Interaction of Soil and Water Conservation Measures With Soil Water in the Loess Plateau in China

Soil water is one of the most important water resources of ecology and many hydrological elements. The Loess Plateau locates on the arid and semi arid area. Because distribution of annual rainfall amount year by year, are cruelly nonuniform, soil water resources are basically important on the growth and development of plants. At the same time distribution and amount of soil water resources are impacted by human action. Soil and water conservation (SWC) in the Loess Plateau is major projects which human transforms the ground layer characteristics and it has impacted on the amount distribution and dynamic progress of the soil water resources. Engineering measures of SWC on the hillslope can improve soil water content. Many kinds of the artificial vegetation which have deeply root systems could decrease the soil water content in their lands, and even formed the drought layer of soil water. To contrast with the artificial vegetation, the natural vegetation, which had higher production, did not degenerate soil water status. That problem is worth further researching for the eco environment construction in the Loess Plateau in China.