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通过在较大范围内的土壤养分空间变异的研究,探讨土壤养分分区管理的可行性,为分区平衡施肥技术提供理论基础。本研究采用传统的M3方法与高效土壤养分分析设备相结合。结果表明,土壤OM、Cu、Fe、Mn和Zn普遍缺乏,其有效含量低于临界值的土样数目占总土样数目的值分别为97.5%、76.9%、69.0%、82.6%、98.6%。不同土壤养分的变异情况各不相同,变异系数在6.9%～88.6%。其中土壤Zn测试值变异最大,其变异系数为88.6%;OM、Cu、Fe和Mn次之,变异系数在31.3%～60.9%;土壤pH测试值变异较小,变异系数为6.9%。研究证明主要土壤养分P、K、Mn和Zn等含量在较大范围内存在着空间相关性,这说明在较大范围内进行土壤养分分区管理是可行的。
Through the research on spatial variability of soil nutrients in a large area, the feasibility of soil nutrient zoning management was discussed and the theoretical basis for balanced fertilization techniques was provided. This study uses the traditional M3 method combined with efficient soil nutrient analysis equipment. The results showed that soil OM, Cu, Fe, Mn and Zn were generally deficient. The soil samples with their effective contents below the critical value accounted for 97.5%, 76.9%, 69.0%, 82.6% and 98.6% of the total soil samples, respectively. . Variation of nutrients in different soils varies, with coefficient of variation ranging from 6.9% to 88.6%. Among them, the variation of soil Zn was the largest, with a coefficient of variation of 88.6%; followed by OM, Cu, Fe and Mn, and the coefficient of variation was between 31.3% and 60.9%. The variance of soil pH was small with a coefficient of variation of 6.9%. Studies have shown that there are spatial correlations among P, K, Mn and Zn contents of major soil nutrients in a large area, which shows that it is feasible to manage soil nutrients in a large area.