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本文研究了耕作土壤农化性状的不均质性,并对采样问题进行了简单的讨论。结果表明:耕作土壤农化性状的不均质性是普遍存在的,但其不均质程度表现在不同土壤和不同农化性状上是有差异的。若以六项农化性状指标的变异系数总和来比较四种供试土壤的不均质程度,则是:草甸土(104.7)>草甸白浆土(95.2)>白浆土(91.6)>黑土(90.1)。从不同农化性状来看,土壤pH的变异普遍最小(C.V%1.59～2.55),有机质、全量氮和全量磷次之(C.V%5.9～15.1),但在草甸土上有例外,三种全量养分物质含量变异系数分别为18.3、19.2和22.4。有效态磷和水解氮的变异最大,变异系数均在23.2以上,最高者达47.1。采集混合农化样样点数的确定,应综合考虑具体分析的需要和所代表土壤的均质状况。
In this paper, the heterogeneity of farming agronomic traits was studied, and the sampling problems were briefly discussed. The results showed that the heterogeneity of agronomic traits of farming soil is ubiquitous, but the heterogeneity of cultivated soils is different in different soils and different agronomic characters. If we compare the heterogeneity of the four tested soils by the sum of the coefficients of variation of the six agronomic traits, then it is: meadow soil (104.7)> meadow white soil (95.2)> white soil (91.6) > Black Earth (90.1). In terms of different agronomic characters, soil pH variation was the lowest (CV% 1.59 ~ 2.55), followed by organic matter, total nitrogen and total phosphorus (CV% 5.9 ~ 15.1) The coefficient of variation of total nutrient content was 18.3, 19.2 and 22.4 respectively. The variation of available phosphorus and hydrolyzed nitrogen were the largest with the coefficients of variation above 23.2 and the highest reached 47.1. The collection of mixed agrochemical samples points to determine, should take into account the needs of specific analysis and the homogeneous soil conditions.