东北黑土区TDR测定农田土壤含水量的室内标定  

Calibration of TDR for soil moisture content at farmland of black soil region in northeastern China

作　　者：刘亮[1] 路炳军[1] 符素华[1,2] 王志强[1,2] 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875 [2]地表过程与资源生态国家重点实验室,北京100875

出　　处：《中国水土保持科学》2013年第6期15-22,共8页Science of Soil and Water Conservation

基　　金：中央高校基本科研业务费专项资金"坡面径流计算方法"(2012LZD11);长江学者和创新团队发展计划"土壤水文与土壤侵蚀"(IRT1108)

摘　　要：土壤水分标定是利用TDR监测农田土壤水分过程中的必要环节。以东北黑土区农田土壤剖面深度上的4种典型介质(黑土层、母质层、过渡层、砂砾层)为试验对象,利用"由湿到干"的土柱试验方法,用烘干法对TDR进行室内标定研究。结果表明:1)TDR内置土壤标定曲线测定的含水量明显低于烘干法测量的含水量。在TDR法土壤含水量标定时,指数关系比线性关系具有更高的标定精度。2)单一介质的TDR法土壤含水量标定曲线对自身介质的标定精度高(最大绝对误差3.2%)。3)混合介质的TDR法土壤含水量标定曲线的标定精度较高(最大绝对误差6.6%),可用于不同介质TDR法土壤含水量标定。本研究结果可用于研究区及类似区域修订TDR法含水量测定结果。It is necessary to calibrate time domain reflectometry （TDR） device when measuring the soil moisture content.In this study,a series of soil column tests were used to calibrate the TDR for soil moisture content.Four soil media （black soil and its parent,transition and sand horizon in turn） in black soil profile were selected as experiment objectives.The moisture content of the soil columns varied from wet to dry.The results showed that the TDR device underestimated soil moisture content in the study area.The soil moisture content measured by TDR method was significantly lower than that measured by the oven-dry gravimetric method.The model efficiency predicted by the exponential way was greater than that by the linear way.The function of soil moisture between TDR and gravimetric methods under the uniform medium can give a good estimation for the same medium （maximum absolute error 3.2％）.The function of soil moisture content obtained from mixed media can be used for different soil media,with a maximum absolute error of 6.6％.The results can serve for determining soil moisture content at similar environments in the black soil region of northeastern China.

关 键 词：土壤含水量 TDR 东北黑土区 

分 类 号：S152.7[农业科学—土壤学]