摘要
为探究生物结皮覆盖下沙质土壤水分入渗规律,以神东煤田李家塔采煤沉陷区的沙质土壤为研究对象,并以无生物结皮覆盖的裸露沙地为对照,对研究区生物结皮基本情况进行调查,同时结合研究区降雨特征开展了降雨及入渗过程模拟试验,测定了土壤入渗速率,研究了生物结皮对降雨的再分配及沙质土壤水分入渗的影响。结果表明:1)距小叶杨基部140cm处与树冠基部结皮覆盖区域0-5cm和5-10cm土层土壤含水量与对照相比,分别降低了2.18%和2.73%。2)生物结皮对土壤水分的入渗有一定的阻碍作用,降低了水分的入渗速率,并缩短了土壤达到稳定入渗的时间。生物结皮覆盖下土壤水分入渗速率为1.86mm/s,15min后达到稳定入渗,对照的水分入渗速率为2.19mm/s,50min后达到稳定入渗。3)生物结皮对降雨具有拦截作用,渗透平均厚度为13.54mm的生物结皮所需降雨量为5.02mm,渗透相同厚度裸露沙地所需降雨量为2.94mm。
In order to explore the law of water infiltration in sandy soil covered by biocrust,the sandy soil in the Lijiata coal mining subsidence area of Shendong coalfield was studied,and the bare sandy land without biocrust was used as the control.The basic situation of biocrust was investigated,and the simulation experiment of rainfall and infiltration process was carried out in combination with the rainfall characteristics of the study area,the soil infiltration rate was measured,and the effects of biocrust on rainfall redistribution and sandy soil water infiltration were studied.The results showed that:1)Compared with the control,the soil water contents of the 0-5 cm and 5-10 cm soil layers with biocrust coverage area at a distance of 140 cm from the base of Poplar lobularis decreased by 2.18%and 2.73%.2)Biocrust has a certain hindering effect on the infiltration of soil water,it reduces the infiltration rate of water and shortens the time for soil to reach stable infiltration.The soil moisture infiltration rate under biocrust was 1.86 mm/s,and stable infiltration was achieved after 15 min.The water infiltration rate of control was 2.19 mm/s,and stable infiltration was achieved after 50 min.3)The biocrust has an interception effect on rainfall.The rainfall that fully penetrated the biocrust with an average thickness of 13.54 mm was 5.02 mm,and that required to penetrate the bare sandy land with the same thickness was 2.94 mm.
作者
龚萍
党晓宏
蒙仲举
迟文峰
常江
GONG Ping;DANG Xiaohong;MENG Zhongju;CHI Wenfeng;CHANG Jiang(College of Resources and Environment Economy,Inner Mongolia University of Finance and Economics,Hohhot 010070;Academician and Expert Work Station for Coordinated Development of Resource Utilization and Environmental Protection of the Northern Frontier of the Motherland,Hohhot 010070,China;College of Desert Management,Inner Mongolia Agricultural University,Hohhot 010018,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2022年第9期120-125,共6页
Journal of Arid Land Resources and Environment
基金
内蒙古自治区科技重大专项资金项目(zdzx2018058-02)
国家自然科学基金(42061069)资助
关键词
生物结皮
降雨拦截
入渗速率
土壤含水量
毛乌素沙地
biocrust
rainfall interception
infiltration rate
soil water content
Mu Us Sandy Land
