水土保持研究2013，Vol.20Issue(2)：66-68,72,4.
土壤碱解氮空间变异与合理采样点数量研究
Spatial Variation Characteristics and Reasonable Sampling Size of Soil Available Nitrogen
摘要
Abstract
Understanding the spatial distribution characteristics of soil available nitrogen is the precondition for making agricultural and environmental policies. Determination of reasonable sample size is the base of obtaining the distribution characteristics of soil available nitrogen efficiently. On the basis of 148 soil sampling points, the spatial distribution characteristics of soil available nitrogen were analyzed, and the reasonable sample sizes were estimated by the regional random sampling theory. The results indicated that the mean soil available nitrogen content was 109. 97 mg/kg, and its coefficient of variation was 0. 29. The available nitrogen content was higher in the central and southeastern regions of the study area. At 95% confidence level, the reasonable sampling sizes were 69 and 27 samples, respectively, with respect to the corresponding 5% and 10% error grades. Accordingly, the sample sizes were 56 and 20, respectively, at the 90% confidence level. The research results can provide reference for making efficient sampling strategy in terms of soil nutrient survey in this region.关键词
土壤碱解氮/空间变异/合理采样点数量/江苏北部Key words
soil available nitrogen/ spatial variability/ reasonable sampling size/ northern Jiangsu province分类
农业科技引用本文复制引用
张忠启,于法展,李保杰..土壤碱解氮空间变异与合理采样点数量研究[J].水土保持研究,2013,20(2):66-68,72,4.基金项目
江苏省高校自然科学研究项目(12KJD210003) （12KJD210003）
徐州市科技计划项目(XZZD1201) （XZZD1201）
江苏师范大学自然科学研究基金项目(10XLR28) （10XLR28）
