摘要
中子法测量田间土壤含水量的误差可分解为位置的、标定的和仪器的三个因素。对麦田5个监测点的测量结果的分析表明,在多数情况下误差主要来自位置因素。标定方差和仪器方差对总方差的贡献在误差(CV)较小时相对较高,虽然仪器方差始终保持在一个很低的量级(10^(-(?))(厘米~3/厘米~3)~2)。中子法的测量结果与经典的重量法比较是近似的,而且它的误差(CV)比重量法小,因此它是可靠的,加上它的操作快捷简便,足以肯定它是田间土壤水分监测的有效工具。
The error of estimates of soil water content in field can be devided into three components, i.e. that of location, calibration, and instrument. The analysis of variance of measurements at 5 locations in a wheat field represents that location component is the main source of error for most of conditions. The contributions of calibration variance and of instrument variance to total variance are relatively high when the error (CV) is low, even the instrument variance is at a very low degree (10^(-6)(cm^3/cm^3)~2). The results of the neutron probe measurements are similar to that of the triditional oven dry method, while errors (CV) of the former are smaller than that of the latter. Therefore, this method should be reliable. In addition to easy and fast to be controlled, this method should be accepted as a effective tool for monitoring soil miosture in field conditions.
出处
《土壤学报》
CAS
CSCD
北大核心
1990年第3期309-317,共9页
Acta Pedologica Sinica
