不同粒径沙壤土水分扩散率测定  

Determination of Water Diffusivity of Sandy Loam Soil with Different Particle

作　　者：古莱姆拜尔.艾尔肯 虎胆.吐马尔白 吴永涛[1] 

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052

出　　处：《新疆农业大学学报》2015年第5期426-430,共5页Journal of Xinjiang Agricultural University

基　　金：国家自然科学基金项目(51069015);新疆水利水电重点学科

摘　　要：在室内用非稳定流水平土柱法对新疆生产建设兵团石河子121团灌区膜下滴灌棉田不同粒径沙壤土水分扩散率进行了实验研究。结果表明:当土壤体积含水率处于0.25~0.30cm^3/cm^3时,Boltzmann变换参数随土壤体积含水率的增大而缓慢降低;当土壤体积含水率低于0.25cm^3/cm^3时,Boltzmann变换参数随土壤体积含水率的增大而迅速降低。当土壤体积含水率接近饱和时,Boltzmann变换参数为零;当土壤体积含水率接近初始含水率时,Boltzmann变换参数趋于无穷大。土壤体积含水率与土壤水分扩散率呈单调递增关系。不同粒径沙壤土的水分扩散率为:0.5~1.0mm>1.0~2.0mm>小于0.5mm。对于同一容重,相同水平距离情况下粒径不同时沙壤土的累计入渗时间和总入渗水量也不同。不同粒径沙壤土累计入渗时间和总入渗水量从大到小排序是:小于0.5mm>0.5~1.0mm>1.0~2.0mm。The water diffusivity of sandy loam in different particle was determined by means of horizontal column infiltration,which used to determine rate of water diffusion of unsteady flow indoors,the soil sam-pled in drip irrigation cotton field.The results indicated that boltzmann parameter decreased with the in-creasing of soil volumetric water content while the soil volumetric water content kept in 0.25 -0.30 cm3/cm3;but when the soil volumetric water content decreased by 0.25 cm3/cm3 ,Boltzmann parame-ter decreased sharply with the soil volumetric water content increasing.When the soil volumetric water content approached to saturation,Boltzmann transformation parameter was zero;when it approached to the initial value,Boltzmann transformation parameter tended to infinity.The soil volumetric water content and the rate of water diffusivity was monotone increasing relation.Water diffusivity of sandy loam soil in differ-ent particle:0.5-1.0 mm>1.0-2.0 mm>0.5 mm.Under the condition of same volume-weight and same lateral distance,the total infiltration time and amount of the water varied with the diameter particles of sandy loam.The rank of soil accumulative time of infiltration and the total infiltration amount was as fol-lows:diameter particles of soil 0.5 mm>0.5-1.0 mm>1.0-2.0 mm.

关 键 词：不同粒径 土壤水分扩散率 土壤体积含水率 波尔兹曼参数 

分 类 号：S152.7[农业科学—土壤学]