以纸坊沟流域为研究对象,研究了植被恢复后不同植被对土壤水分的影响情况,得出如下结论:①草地土壤水分含量大于灌木林地,灌木林地土壤水分含量大于乔木林地;②选用乡土树种油松造林对土壤的干化程度较轻,选用刺槐造林时要考虑立地条件和造林密度,林草隔带种植可以减轻土壤干化程度;③灌木林下阴坡土壤干层并不比阳坡干层程度轻。土壤干化程度和植被种类直接相关。此外,受种植密度及人为干扰影响;④和以前人们的认识不同,天然草本植被也会形成土壤干层,其中白羊草和长芒草形成有利于自身群落稳定的干层,但茭蒿形成的干层则对自身稳定不利,在植被建设上应引起足够重视。

According to the study on the effect of soil water on rehabilitation of vegetation in Zhifanggou watershed of loess hilly region,the following conclusions are drawn:(1)The content of water in grass ground is higher than in shrub ground and the shrub ground's is higher than aboreal ground's.(2)The pine(pinus tabulaeformis)makes a lighter dried soil layer.By means of strip forestation,the content of the water of Robinia(Robinia pseudoacacia)ground can be improved.(3)The degree of the dried soil layer is related with vegetation and forestation density.(4)The natural vegetation may cause a dried soil layer too.