关键词: 黄土高原半干旱区, 集流灌草配置, 水分调控

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