黄土高原侵蚀区长芒草对坡地土壤水分养分的影响

在黄土高原神木六道沟流域选相邻退耕坡地和裸地,均匀布点采样结合室内分析,采用SPSS处理数据,研究30龄长芒草(Stipa bungeana)对土壤水分、养分的影响。结果表明:在长芒草根系分布区土壤水分下降很快,并且形成干层,其中40~60 cm含水量均低于5.5%,最低达3.2%;同时,长芒草可使土壤养分在表层累积,而降低20~50cm土层处养分含量;全氮、全磷、有机质、硝态氮和铵态氮含量均随土层的加深而降低。

The effects of Stipa bungeana Trin.sown 30 years ago on the soil water contents and nutrients of the sloping lands in Loess Plateau were studied in Shenmu Experimental Station by the comparison of S.bungeana vs.bare sloping lands.The results show that the soil profile with the root distribution of S.bungeana had lower water contents and someplace formed the desiccation in deep soil layer.The mean soil water content in depth of 40-60 cm was below 5.5% with lowest point at 3.2%.The plantation of S.bungeana re...