南方丘陵山区耕地土壤养分空间变异及合理采样数

发布时间：2018-02-08 08:09

本文关键词： 土壤养分二分法空间变异合理取样数　出处：《江苏农业学报》2017年03期 　论文类型：期刊论文

【摘要】：以江西省兴国县丘陵山区为例,取2 398个样点并测定其土壤有机质、有效磷和速效钾含量。运用半变异函数分析土壤养分的空间变异特征,再基于普通克里金法对样点以固定比例进行随机抽样,根据均方根误差波动的绝对值确定一个区间后,采用数学二分法进一步研究取样数。结果表明,有机质的变异系数最大,有效磷次之,速效钾最小;土壤有机质、有效磷和速效钾含量呈现中等空间相关性且变程较小;兴国县丘陵山区土壤有机质、有效磷和速效钾的合理采样数分别为1 366、1 170、1 690,合理采样密度分别为1 hm~20.044个、0.038个、0.055个。
[Abstract]:Taking the hilly areas of Xingguo County, Jiangxi Province as an example, 2,398 samples were taken and the contents of soil organic matter, available phosphorus and available potassium were determined. The spatial variation characteristics of soil nutrients were analyzed by semi-variance function. Based on the ordinary Kriging method, the sample points are randomly sampled in a fixed proportion, and an interval is determined according to the absolute value of the root mean square error fluctuation. The mathematical dichotomy is used to further study the sampling number. The results show that the coefficient of variation of organic matter is the largest. Available phosphorus was the second, available potassium was the least, soil organic matter, available phosphorus and available potassium content showed moderate spatial correlation and the variation range was small; soil organic matter in hilly and mountainous areas of Xingguo County, Xingguo County, The reasonable sampling numbers of available phosphorus and available potassium were 1366 ~ 1 170 ~ 1 690, and the reasonable sampling densities were 1 hm- 20.044 and 0.038 ~ 0.055, respectively.
【作者单位】：江西农业大学江西省鄱阳湖流域农业资源与生态重点实验室/国土资源与环境学院;江西农业大学林学院;
【基金】：国家自然科学基金项目(41361049) 江西省自然科学基金项目(20122BAB204012) 江西省赣鄱英才“555”领军人才项目(201295)
【分类号】：S158

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