【摘要】 对柳州市一个面积约20hm2的柚子园采用50m×50m网格取样,布设76个采样点,对土壤pH、有机质、碱解氮、速效磷、速效钾的空间变异性及合理取样数作初步研究。结果表明,该柚子园土壤pH、有机质以及大量营养元素含量变异系数范围为6.45%~59.48%。地统计分析表明,这些土壤肥力属性均在一定范围内存在空间相关性,土壤速效钾的空间相关性弱,而有机质、碱解氮具有中等的空间相关性,土壤pH、速效磷空间相关性强。同时探讨了研究区域土壤的pH值、有机质和大量营养元素的合理取样数,结果显示,在95%置信水平下,土壤碱解氮选用5%的相对误差,土壤pH选用10%的相对误差,其余指标选用15%的相对误差水平,土壤pH、有机质、碱解氮、速效磷、速效钾的推荐取样数分别为2、6、34、28、35个。更多还原

【Abstract】 In this study,76 samples of tilled soil were collected with 50m ×50m grid sampling method in a pomelo plantation with about 20 hm2 area in Liuzhou City,and the spatial variability and rational sampling number of pH,organic matter(SOM),available N,P and K in the soil were preliminarily tested.The results showed that the coefficient of variation of pH,SOM and macronutrient was in the range of 6.45%-59.48%.The geostatistic analysis indicated that all of the soil properties had spatial correlation within limits,the spatial correlation of available K was weak,that of SOM and available N were intermediate,and the spatial correlation of soil pH and available P were strong.Moreover,the rational sampling number of all soil properties had been studied.The results indicated that at 95% confidence level,the samples for available N and pH should be 34 and 2 under 5% and 10% relative error,respectively;and those of SOM,available P and K should be 6,28 and 35,respectively,under 15% relative error.更多还原