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为了探讨植被恢复对土壤养分的影响,研究了毛乌素沙地南缘天然草地、人工封育草地、撂荒地、退耕还林地、固定沙地5种不同植被恢复类型区的土壤养分特征。结果表明:不同植被恢复类型对土壤有机质、全氮、有效氮、速效磷的影响存在明显差异;灌草结合的人工封育草地、退耕还林地、固定沙地土壤有机质、全氮、有效氮的含量高于以草本为主的天然草地和撂荒地,但土壤速效磷的含量刚好相反;植被对表层0~20 cm土壤养分的影响大于下层20~60 cm土壤,植被作用下土壤养分向表层富集;采用柠条进行退耕还林,能够充分发挥其根系特性,有利于改良深层土壤养分。
In order to explore the effects of vegetation restoration on soil nutrients, the characteristics of soil nutrients in five different vegetation restoration areas of natural grassland, artificial enclosed grassland, fallow land, returning farmland to forest and fixed sandy land in the southern margin of the Mu Us desert were studied. The results showed that there were significant differences in the effects of different types of vegetation restoration on soil organic matter, total nitrogen, available nitrogen and available phosphorus. In artificial enclosing grassland, returning cultivated land to forestland, and fixed sandy land, soil organic matter, total nitrogen and available nitrogen The contents of available phosphorus in soil were just the opposite. The effects of vegetation on soil nutrients in 0 ~ 20 cm layer were greater than those in 20 ~ 60 cm layer in the lower layer. Under the influence of vegetation, the contents of soil nutrients in the top layer Set; using Caragana to return farmland to forest, can give full play to its root characteristics, is conducive to improving deep soil nutrients.