CORRELATION AND VARIABILITY OF SOIL PROPERTIES OF ARABLE СHERNOZEMS IN THE SOUTH OF THE CENTRAL RUSSIAN UPLAND

M.A. Smirnova, A. N. Gennadiev, Y. Chendev, M. V. Bocharnikov
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Abstract

Search for correlations between different soil properties and assessment of their variability is important for understanding soil functioning, allows more optimal planning of field and laboratory research and creates the basis for fertilizing management and precision agriculture. This work is based on the data on the content of organic carbon, pH, bulk density, texture (fractions 1-0,25 mm; 0,25-0,05 mm; 0,05-0,01 mm; 0,01-0,005 mm; 0,005-0,001 mm and <0,001 mm and <0,01 mm), exchange calcium and magnesium carbonates for twelve sites of plowed Chernozems studied in the southern part of the Central Russian Upland (Belgorod oblast). Soil samples were taken layer by layer every 20 cm to 3 m depth. Weak correlation was revealed among studied soil characteristics of the plowed Chernozems. The least correlation with other soil characteristics is characteristic of bulk density, organic carbon content, content of fraction 0,25-0,05 mm and 0,01-0,005 mm. Correlation between the content of bicarbonates and pH values is observed only for accumulative - carbonate horizon and transition horizons. The largest number of correlations between different soil characteristics is for the non-plowed part of humus horizon and the top of transition horizon. The least amount of correlations between soil characteristics was found at depths from 80 to 100 cm. Comparison of the coefficients of variations calculated for different soil layers of a single profile (i. e. intraprofile variability) and for the same soil layers but from different profiles (i. e. lateral variability) showed that the intraprofile variability exceeds the lateral one for the organic carbon, exchangeable potassium and calcium content.
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俄罗斯中部高原南部可耕地土壤特性的相关性和可变性
寻找不同土壤特性之间的相关性并评估其变异性对于了解土壤功能非常重要,可以更优化地规划田间和实验室研究,并为施肥管理和精准农业奠定基础。这项研究基于俄罗斯中部高原(别尔哥罗德州)南部 12 个切尔诺泽姆耕地的有机碳含量、pH 值、容重、质地(1-0.25 毫米;0.25-0.05 毫米;0.05-0.01 毫米;0.01-0.005 毫米;0.005-0.001 毫米和小于 0.001 毫米和小于 0.01 毫米)、碳酸钙和碳酸镁交换量等数据。土壤样本每 20 厘米至 3 米深逐层采集。所研究的切尔诺泽姆耕地土壤特性之间的相关性较弱。容重、有机碳含量、0.25-0.05 毫米和 0.01-0.005 毫米颗粒含量与其他土壤特性的相关性最小。碳酸氢盐含量与 pH 值之间的相关性只存在于累积碳酸盐地层和过渡地层中。不同土壤特性之间相关性最大的是腐殖质地层的未耕部分和过渡地层的顶部。在 80 厘米至 100 厘米的深度,土壤特性之间的相关性最小。对单个剖面的不同土层(即剖面内变异性)和不同剖面的相同土层(即横向变异性)计算出的变异系数进行比较后发现,在有机碳、可交换钾和钙含量方面,剖面内变异性超过横向变异性。
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