中子仪测定表层土壤含水率

Determination of Water Content of Top Soil by Neutron Probe

本文给出了用普通中子仪对表层土壤0—10cm、10—20cm和0—20cm三种层次的率定试验结果,表明用曲线关系代替直线关系后率定精度有大幅度的提高。同时也讨论了影响表层测定精度的两个特殊因素。文中还给出了用取土法和中子仪测定法的比较结果,表明中子仪法的误差可控制在允许误差范围内。

The calibration of normal neutron probe for three layers of top soil has been presented in this paper, the result shows that the accuracy of calibration has been significantly improved by using curved line instead of straight line. Two special factors which influence the accuracy of calibration for top soil have been discussed also in this paper. In addition, the measured values of soil water content by soil sampling method and neutron prob method have been compared, the results show that the error from the probe measuring can be controlled within the permissible error level.