盐分对土壤电阻率的影响研究  

Influence research of salts on the soil resistivity properties

作　　者：张润霞[1] 王益权[1] 解迎革[2] 史红平[1] 徐鹏霞 刘建魁[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学理学院,陕西杨凌712100

出　　处：《干旱地区农业研究》2015年第2期208-213,共6页Agricultural Research in the Arid Areas

基　　金：陕西省农业厅"渭北果园土壤钙素退化"研究(K332021312)

摘　　要：为了解盐渍化对土壤电阻率的影响,本研究在室内设置了不同盐分类型、不同盐分浓度的土壤,采用四电极法对各处理的电阻率进行相应测定,分析了土壤含水量、含盐量和单、复盐构成对土壤电阻率的影响。研究结果表明:土壤电阻率随着含水量的增大而从16.08Ω·m下降到4.25Ω·m,呈对数函数下降;随盐分含量的增大呈幂函数下降,含Na Cl盐分的土壤电阻率从2.04Ω·m下降至0.20Ω·m,含Na2SO4盐分的土壤电阻率从2.89Ω·m下降至0.39Ω·m;不同盐分类型的构成对电阻率的影响同样存在显著差异,含盐量为0.1%时,碳酸盐、硫酸盐、氯化物盐、氯化物-硫酸盐作用下土壤的电阻率分别为4.40、3.64、2.05、2.25Ω·m,碳酸盐对土壤电阻率影响明显;当含盐量分别为0.5%、1.0%、1.5%、2.0%时,硫酸盐对土壤电阻率影响显著,对应的硫酸盐土壤电阻率分别为1.72、1.03、0.74、0.58Ω·m,氯化物盐土壤电阻率分别为0.59、0.36、0.27、0.21Ω·m。含水率和盐分总量是影响土壤电阻率的重要因素,电阻率随土壤中Na Cl和Na2SO4含量的增加均呈幂函数递减规律;单、复盐类型不同,对土壤电阻率的影响存在差异。In order to know the impact of salinization on soil resistivity ,have put up the soil samples with different salt type and concentration and measured the electrical resistivity of eah treatment using the four -electrode method in lab-oratory ,also analyzed the impacts of soil water content ,salt concentration and single ,double salt composition on the soil electrical resistivity .The research results showed that ：The soil electrical resistivity was decreased from 16 .08 Ω·m to 4 .25 Ω·m with increase of the soil moisture content assumed a logarithmic function ;and it was decreased with increase of the salt concentration assumed an exponential function .The soil electrical resistivity was decreased from 2 .04 Ω·m to 0 .20 Ω·m with NaCl ,it was decreased from 2 .89 Ω·m to 0 .39 Ω·m with Na2SO4 .The composition of different salt type still present notable difference on the soil electrical resistivity .When the salt content was 0 .1% ,under the action of carbonates ,sulfates ,chlorides and chloride-sulfate ,the soil resistivity was 4 .40 ,3 .64 ,2 .05 Ω·m and 2 .25 Ω·m , respectively .The carbonate had obvious effect on soil resistivity .When the salt content was 0 .5% ,1 .0% ,1 .5% and 2 .0% ,the sulfate had obvious effect on soil resistivity ,the relative soil resistivity was 1 .72 ,1 .03 ,0 .74 Ω·m and 0 .58 Ω·m ,respectively ,and for the chlorides salt ,the soil resistivity was 0 .59 ,0 .36 ,0 .27 Ω·m and 0 .21 Ω·m ,re-spectively .The soil moisture content and the total amount of salt were the important factors affecting soil resistivity .The soil resistivity was assumed a power function decrease with the increase of the NaCl and Na 2SO4 content ;The different salt types of single and double ,existed different impact on soil resistivity .

关 键 词：电阻率 含水量 盐分含量 盐分组成 

分 类 号：S153.3[农业科学—土壤学]