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选取我国西南地区典型的水耕人为土剖面,模拟不同的水热条件,研究其诊断层土壤特性(pH、EC)的动态变化,并分析其与其他土壤理化性质的相关性。结果表明:(1)在不同的温度下,土壤的pH值有变化,但变化不显著。土壤的EC变化比较大,随着温度的升高,土壤的EC增大。(2)水耕熟化和发育程度较高的水耕人为土的电导率较高(土壤呈强碱性的除外),水耕表层的电导率比氧化还原层高。(3)土壤特性(pH、EC)与土壤粘粒含量呈正相关关系。(4)不同水热条件下水耕人为土土壤pH、电导率动态变化特征,可用动态变化函数方程进行拟合。研究结果对土壤系统分类定量指标建立有一定参考意义。
The typical hydroponic man-made soil profile in southwestern China was selected to simulate different hydrothermal conditions. The dynamic changes of soil pH (pH, EC) in the diagnostic layer were studied and their correlations with other soil physical and chemical properties were analyzed. The results showed that: (1) At different temperatures, the pH value of soil changed, but the change was not significant. Soil EC changes relatively large, with the increase of temperature, soil EC increased. (2) Hydrophilic artificial soil with higher degree of hydroponics and hydroponics has higher conductivity (except when the soil is strongly alkaline), and the conductivity of hydroponic surface layer is higher than that of redox layer. (3) There is a positive correlation between soil characteristics (pH, EC) and soil clay content. (4) The dynamic characteristics of pH and conductivity of hydroponics artificial soil under different hydrothermal conditions can be fitted by the dynamic change function equation. The results of the study have certain reference value for establishing quantitative index of soil system.