采样点数量对长三角典型地区土壤肥力指标空间变异解析的影响
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国家自然科学基金项目(40601039)、江苏省自然科学基金项目(BK2009340)和中国科学院知识创新工程重要方向项目(KZCX2-YW-409)资助。


Effects of sample size on spatial characterization of soil fertility properties in an agricultural area of the Yangtze River Delta region, China
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    摘要:

    通过对江苏省如皋市888个采样点的不重复随机抽样,探讨了采样点数量对土壤肥力指标空间变异解析的影响。从半方差函数估计的可靠性角度考虑,在长江冲积物形成的土壤上,针对县级农业管理和生态环境规划的土壤肥力指标调查采样,采集250个样点较为合适。另外,仅使用交互验证和独立验证评价半方差函数估计的可靠性及确定采样点数量是不完善的,而平均克里格方差理论上随采样点数量的增加而单调递减,可以作为不同采样点数量条件下,综合评价半方差函数估计可靠性及确定采样点数量的补充指标。

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    Reasonable sample size or sampling density is an assurance of the accuracy of soil spatial variability analysis which is important for sustainable use of soil resources. This study discussed the influence of sample size on variogram estimation and the criterion used to judge the adequacy of sample size by comparing non-replicated random samples of 400, 250, 150, and 50 from a total of 888 samples. For reliability of variogram estimation, we suggested that a minimum sample size of 250 should be used for soils developed from Yangtze River alluvium in the Yangtze River Delta Region. This sample size recommendation is suitable for agricultural and environmental management and municipal zoning of a county. The results also showed that it is inaccurate to evaluate the reliability of variogram estimation and the adequacy of a sample size by cross-validation and validation alone. However, theoretically, average kriging variance monotonical decrease with the increase of sample size is a suitable complementary criterion to assess the reliability of variogram estimation and the adequacy of a sample size.

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王志刚,赵永存,黄 标,Darilek Jeremy Landon,孙维侠.采样点数量对长三角典型地区土壤肥力指标空间变异解析的影响[J].土壤,2010,42(3):421-428. WANG Zhi-gang, ZHAO Yong-cun, HUANG Biao, DARILEK Jeremy-landon, SUN Wei-xia. Effects of sample size on spatial characterization of soil fertility properties in an agricultural area of the Yangtze River Delta region, China[J]. Soils,2010,42(3):421-428

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