青海湖防沙工程措施区土壤水分及入渗特征初步研究

Preliminary Study on Soil Water and Permeability Characteristics of Desertification Combating Areas Exerted by Engineering Measures around Qinghai Lake

选取青海湖沙区(克土和湖东种羊场)的草方格沙障,主要研究防沙措施的实施对该地区沙土物理性质的影响,采用烘干法和张力入渗仪对其土壤重量含水率及饱和导水率进行了测定。研究结果表明:克土和湖东种羊场的土壤含水率随深度变化都基本符合先增加后下降的趋势;土壤饱和导水率在克土区表现为半流动沙丘>丘间低地>坡底草方格>封沙育草区,湖东种羊场表现为:迎风坡中部草方格>坡底草方格。坡底沙土的入渗较迎风坡坡中部慢,主要与土壤粒度和含水率有关。粗砂含量较高、土壤水分较低的土壤表层渗透较快,而植被盖度较高并且有结皮的土壤表层渗透较慢。

This study selected straw sand-barriers in Qinghai Lake areas,to study desertification combating measures how to influence sandy soil,measuring soil water by drying method and saturated hydraulic conductivity by tension infiltration.The preliminary results were obtained： in Ketu area,soil water content of the straw sand-barriers of semi-mobile dune,the mobile dune,the interdune,the fenced area,and the straw sand-barriers in the bottom of slope,the middle of windward and the bottom of slope of the east of Lake all first increased nearly,then it showed the reducing trend.The saturated hydraulic conductivity in Ketu area,the semi-mobile dunethe interdunethe straw sand-barriers in the bottom of slopethe fenced area,and in the east of Lake,the middle of windward was higher than the bottom of slope.The saturated hydraulic conductivity was related with the sand soil particle,soil water,vegetation cover and soil crust.