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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～ 50 0 cm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 1 2 0～ 2 0 0 cm,厚度为 1 0 0 cm。在第 8年干土层扩大到 1 0 0～ 30 0 cm,厚度为 2 0 0 cm。第 1 4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～ 50 0 cm多年土壤贮水量 ,在生长初期 ( 4月份 ) ,1 5年生柠条480 .1 5mm,1 2年生沙棘、山桃分别为 41 4.6mm和 385.4mm,在生长末期 ( 1 0月 ) ,柠条 498.31mm,沙棘 42 3.31 mm,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?
The coexistence of drought and soil erosion in this area, uneven distribution of rainfall in time and space, and hydrothermal are not synchronized (in spring and summer, plants often died of water shortages), resulting in the restoration of vegetation in the ecological environment is difficult. To this end, the project site preparation methods and three-dimensional arrangement of shrubs, the development of flow shrubs and grasses vegetation, storage of soil moisture and promote the rapid recovery of shrubs and grasses. The results showed that when the Caragana korshinskii and Elymus spp. Were grown at the horizontal order, the water content in 0 ~ 50 0 cm soil layer at the early stage of growth could be divided into three distinct levels. In the fourth year of growing, Excess water, there are obvious dry soil layer, the distribution depth of 120 ~ 200 cm, thickness of 100 cm. In the 8th year, the soil layer has been expanded to 100 ~ 30 0 cm with a thickness of 200 cm. In the first four years, the soil moisture content has risen somewhat, but with a small increase, only 1.5 to 2.0 percentage points higher than in the eighth year. As the growth stage of Caragana korshinskii shrubs in the horizontal order increases, whether the changes of water storage amount will increase still remains to be studied. The water storage capacity of 0 ~ 50 cm soil layer from 0 to 50 cm in this area was 41 4.6 mm and 385.4 mm respectively at the beginning of growth (April) 0 months), Caragana 498.31mm, Seabuckthorn 42 3.31 mm, mountain peach 445.9mm. Accounting for only 30% -58% of the field water holding capacity, which is close to or slightly higher than the wilting humidity. Therefore, the current soil water storage capacity can not meet the growth of shrubbery and can only sustain its life. From the analysis of soil water consumption and storage, the allocation of Caragana korshinskii and Gramineae is the best shrub type suitable for this area, followed by the peach and sand.