黄土高原西部荒漠草原植被恢复的土壤水分管理研究

针对兰州地区荒漠草原带具有代表性的三种地带性植被：草本植被短花针茅、灌木植被珍珠猪毛菜、荒漠锦鸡儿，对其0~2.0 m的土壤含水量进行了比较,同时对草本和灌木植被的根系进行了测定。结果表明：天然植被对土壤含水量的影响在1 m以上。随着土壤深度的不断加深,土壤含水量呈减少趋势而后趋于稳定。短花针茅区1 m以上含水量比珍珠猪毛菜和荒漠锦鸡区平均高1.08和1.21个百分点;1 m以下土壤含水量变化情况是:珍珠猪毛菜区最高，荒漠锦鸡儿区最低。本文在分析了兰州地区荒漠草原区土壤水分动态的基础上，提出了这一地区植被恢复的对策。

Management of Soil Moisture for Desert Steppe Vegetation Rehabilitation in Western Loess Plateau

The study compared soil moisture in 0~2 m layer under the three representative natural zonal vegetations in the Desert Steppe of Lanzhou area,they are the herbage of Stipa breviflora,the shrubs of S.passerina Bunge and C.roborovski;at the same time determined the roots distribution of natural herbage and shrub vegetation.The study results showed that the natural vegetation affected soil moisture mainly in the soil layer of 0~1m,from which down soil moisture reduced,then came to the stabilization when the soil depth became certain deep.The mean soil moisture in soil layer of 0~1m under Stipa breviflora herbage was higher than that of under S.passerina Bunge and C.roborovski shrubs,and respectively with a increase of 1.08% and 1.21%.Below 1 m,the dynamic range of soil moisture was the highest under shrubs of S.passerina Bung,the lowest under the shrubs of C.roborovski. After analyzing the effect of natural vegetation on soil moisture in the Desert Steppe of Lanzhou area,the study had given some advice about vegetation rehabilitation of this area.