氮对土壤-植物系统中重金属的影响研究

Effect of nitrogen on behavior of heavy metals in soil-plant system

氮肥可以影响土壤对重金属的吸附解吸,改变土壤重金属的形态,进而改变重金属在土壤中的活性,影响植物对其吸收、累积。结果表明,不同氮肥影响重金属吸附解吸的主要机制是土壤pH值的变化,水溶态重金属含量与pH值呈显著负相关。氮肥主要是通过影响土壤pH值的变化来影响土壤中重金属形态转化。不同氮肥形态及不同氮水平均对植物吸收积累重金属有显著影响。

Nitrogen（N） can affect the absorption and desorption and change the form and the activtty of heavy metals in soil, affecting their uptake and accumulation by plants. The change in soil pH led to different effect of different N on the absorption and desorption of heavy metals. Significant negztlive correlation was found between soil pH and water-soluble heavy metal. Effects of nitrogen fertilizer on the soil influence the transformation of heavy metals in soil mainly through changes in pH value. The accumulation contents of heavy metals in plants were significantly affected by differenl nitrogen forms and nitrogen level.