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本文从能量学观点,对山东的棕壤、褐土进行了不同土水势条件下,土壤溶液中水溶性氮、磷、钾的研究。结果表明:1.土壤溶液中氮的浓度从0～3.0巴迅速增加,>3.0巴又逐渐下降,但水溶性氮的总量是随土水吸力增加而减少。2.土壤溶液中水溶性磷、钾的浓度和总量基本上是随土水势的降低而下降。3.以3.0巴作为一个临界线,当土水势小于3.0巴时土壤溶液中养分的含量较高,大于3.0巴时其能态明显下降。4.在0～6.0巴5个吸力段中,土壤溶液中水溶性养分的含量占土壤中速效养分的百分数分别是:速效N2.2～2.0;速效P1.8～3.4;速效K5.4～1.6。
In this paper, from the energy point of view, the brown soil and brown soil in Shandong Province under different conditions of soil water potential, soil water-soluble nitrogen, phosphorus and potassium. The results showed that: 1. The concentration of nitrogen in soil solution rapidly increased from 0 to 3.0 bar, and then decreased gradually from> 3.0 bar, but the total amount of water-soluble nitrogen decreased with the increase of soil water suction. Soil water soluble phosphorus and potassium concentrations and total amount is basically decreased with the decline of soil water potential. 3. With 3.0 bar as a critical line, the nutrient content of the soil solution is higher when the soil water potential is less than 3.0 bar, and its energy state is obviously decreased when the soil water content is more than 3.0 bar. In the five suction sections of 0 ~ 6.0 bar, the contents of water-soluble nutrients in soil solution to soil available nutrients were: N2.2 ~ 2.0, quick-acting P1.8 ~ 3.4, fast-acting K5.4 ~ 1.6.