中子法测定旱地土壤水分中标定方法的改进

An Improvement of the Specified Method of soil Neutron-probe Gauge in Determining Soil Moisture in Dryland

本文报道了中子土壤水分仪在田间直接标定的一种方法:多点标定与土壤含水量(重量％)均值分级回归法。采用此法所标定的曲线方程相关系数达0.99304,土壤含水量响应范围为10％～20.69％.该法可提高所标定曲线精度,较好的适应水分变化范围,达到一次性标定成功,经取土实测比较,最大差值为0.0198。此法并在西北农业大学水利系灌溉研究室进行实验验证。

This paper reports the direct spccifficd method by using the neutron-probe to determine soil moisture in the Held: the multiple point specification and the mean value grading retrogression method of soil moisture contents (weight %).Thc correlation cocfllcicnt of curve equation specified by adopting this method reaches 0.99304.Soil moisture rcsponcs scope is 10%-20.69%.This method may raise accuracy of specification curve and adapt to the changing scope of soil moisture, lhus,achicving the successful specification of neutron-probe ga-ugc.Thc greatest difference value reaches 0.0198 through comparison'by taking soil samples in actual determination. The method has been tested in the Irrigation Research Laboratory of Water Conservancy Department of Northwestern Agricultural University.