Abstract: Because of drought and loss of water and soil and bad proportional rainfall in time and space and mismatch of water and heat that recovery of vegetable is very difficult.In the past years,through industrial and biological(solid collocation of shrub and grass)method ,water collected shrub grass vegetable is applied to regulate soil moister and foster recoery of shrub and grass.Result show that in the early phase of Caragana korshinskii and Elymus dahuricus ,there is three distinct layer in 0-500cm:As it grow and root stretch deeper,more and soil water is needed ,in the forth year dry layer appear between 120-220cm,depth 100cm.In the 8th year,dry layer expand between 100-300cm,depth 200cm.In the 14th year,water content rise slightly 1.5-2.0 percent against the 8 th year's.Further research is needed for the lever step ploughed C.korshinskii shrub to decide whether the water content rises as it grows.In the experimental site,even soil water in store between 0-500cm is ,in the early grow season(June),15 years growth C.korshinskii 480.15 mm,12 Hippophae rhamnoides and Prunus davidiana 414.6mm and 385.4mm.In the last stage of grow season(October) C.korshinskii 498.31mm,H.rhamnoides 423.51mm P.davidiana 445.29mm,so the content is only 30%-58% of the field could hold nnd close to or higher than the limit of welting,in this water lever,shrub can survive but can meet its growth. C.korshinskii and grass is the best collocation,next is H.rhamnoides and P.davidiana.

Key words: Semi arid region of loess plateau, Solid collocation of water collected shrub grass, Water regulation

摘要： 该区干旱与水土流失并存,降雨量时空分配不均,且水热并不同步(在春夏,植物常因缺水而枯死),致使生态环境建设中恢复植被的难度大。为此,采用工程整地措施与灌草立体配置模式,发展集流灌草植被,调蓄土壤水分,促进灌草植被的快速恢复。结果表明,在水平阶营造柠条和披碱草,在生长初期0-500cm土层含水量可分为3个明显的层次;在生长的第4年随着灌草根系深扎,土壤水分过耗,出现明显的干土层,分布深度在120-200cm,厚度为100cm。在第8年干土层扩大到100-300cm,厚度为200cm。第14年土壤含水量有所回升,但幅度不大,同第8年相比,仅提高1.5-2.0个百分点。水平阶的柠条灌木林随着生长时间的延续,其水分贮量变化是否增加,仍有待继续研究。该区0-500cm多年土壤贮水量,在生长初期(4月份),15年生柠条480.15mm,12年生沙棘、山桃分别为414.6mm和385.4mm,在生长末期(10月),柠条498.31mm,沙棘423.31mm,山桃445.9mm。仅占田间持水量的30%-58%,接近或略高于凋萎湿度,因此,目前的土壤贮水量并不能满足灌木林的生长,仅能维持其生命。从土壤水分的消耗与贮量分析,柠条与禾本科配置是适宜该区建造的优良灌木类型,其次为山桃和沙?

关键词: 黄土高原半干旱区, 集流灌草配置, 水分调控