祁连山区不同尺寸双环入渗仪对比试验  

Comparison Experimental Study on Double-ring Infiltrometers with Different Sizes in the Qilian Mountain

作　　者：阳勇[1,2] 陈仁升[1,2] 宋耀选[1,2] 郭淑海[1,2] 刘章文[1,2] 王磊[1,2] 

机构地区：[1]中国科学院西北生态环境资源研究院黑河上游生态-水文试验研究站,兰州730000 [2]中国科学院内陆河流域生态水文重点实验室,兰州730000

出　　处：《水土保持学报》2017年第1期328-331,336,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41401041);国家重大科学研究计划项目(2013CBA01806)

摘　　要：设计7组不同内外径的双环入渗仪,在位于祁连山区的黑河上游平坦草地开展多次野外土壤入渗试验,对比分析双环入渗仪内外环尺寸对土壤入渗率和饱和导水率的影响。结果表明,双环入渗仪内径相同时,外径越大则稳定入渗率和饱和导水率越小;外径相同时,内径越小则稳定入渗率和饱和导水率越小。初始入渗率与双环入渗仪尺寸关系不显著,但稳定入渗率和饱和导水率与入渗仪缓冲指数呈显著负相关。综合考虑安装简便,用水条件,试验可靠等多方面因素,推荐山区使用内径20cm,外径40cm的双环入渗仪。Seven groups of double-ring infiltrometers,with different inner and outer diameters,were laid out and conducted in the grassland flat field in the Heihe river upstream in Qilian mountains,to investigate effects of the size of the infiltrometers on the measurement of the infiltration process and saturated hydraulic conductivity.The results showed that if the inner diameters of double-ring infiltrometer were same,the larger the outer diameter,the smaller the stable infiltration rate and saturated hydraulic conductivity;and if the outer diameters were same,the smaller the inner diameter,the smaller the stable infiltration rate and saturated hydraulic conductivity.The stable infiltration rate and saturated hydraulic conductivity were significantly negative correlation with the buffer index of double-ring infiltrometers,but there was no clear correlation between the initial infiltration rate and the buffer index.Considering the simplicity of installation,water demand and apparatus accuracy,the double-ring infiltrometer with the diameters of 20 cm and 40 cm for the inner and outer rings was recommended to measure the soil water infiltration process and saturated hydraulic conductivity in the mountainous regions.

关 键 词：双环入渗仪 入渗率 饱和导水率 缓冲指数 

分 类 号：S157.1[农业科学—土壤学]