摘要
利用2007年河南省30个农业气象基本观测站每旬的土壤水分测定记录,对不同地段、不同土壤层次的取样误差进行了初步分析,结果表明:固定地段土壤水分样本的年平均相对误差为5.32%,比作物地段高0.38%;固定地段和作物地段满足相对误差<50%的取样比例分别为61.50%和66.20%;不同地段0-50 cm相对误差随土壤深度增加均呈先减小后增大的趋势,郑州和南阳两个测站50-100 cm水分测定值较为稳定,误差随深度波动不大。
Sampling error for different spots and different layers was analyzed by taking advantage of soil water measuring records every ten days during 2007 at 30 stations in Henan province. The results showed that the yearly average sampling error at fixed spot was 5.32% , which was 0.38% higher than crop spot ; the sampling proportion satisfied the command that relative error less than 5.0% was 61.50% and 66.20% for fixed and crop spot respectively; the relative error of 0--50 cm first decreased then in- creased for both spots, while the records of 50--100 cm was stable comparatively at Zhengzhou and Nanyang stations that the error varied smoothly with depth.
出处
《气象与环境科学》
2009年第2期33-36,共4页
Meteorological and Environmental Sciences
基金
中国气象局气象新技术推广项目(CMATG2008M44)资助
关键词
取样误差
土壤水分
烘干称重法
sampling error
soil water
drying and weighing method
