冬小麦种植条件下湖泊底泥农用土壤重金属锌的形态及其影响因素

Chemical Forms of Zinc in Soil and Its Affecting Factors by Agriculture Utilization of Lake Sediments and Wheat Planting

研究了田间种植小麦条件下,底泥农用前后土壤中重金属锌的形态演变,以及盆栽种植小麦条件下,pH值、碳氮比、质地对底泥农用土壤重金属锌形态演变的影响。结果表明,随着底泥施用量的增加,土壤中可交换态、碳酸盐结合态、铁锰氧化物结合态、有机结合态、残渣态锌含量均有不同程度的增加。高pH、碳氮比为25∶1、粘土质地条件,可以导致土壤中可交换态锌的含量减少。植株中根系>茎叶>籽粒中锌的含量,并随底泥施用量的增加而增加。

This paper discussed the chemical forms conversion of the heavy metal zinc in the soil by the agriculture utilization of lake sediments by the plot experiments of wheat and the effects of pH,C/N and texture grade of the soil to the chemical forms conversion of the heavy metal zinc in the soil by the pot experiments. The results showed that the concentration of the exehargeable, carbonate, Fe-Mn oxide combined, organic and residual forms of the zinc increased in the soil with the increase of the amount of the lake sediments. When pH is 8.3, C/N is 25 ： 1 and clay is used, it can decrease the concentration of the exehargeable form of the zinc in the soil. In the plant, the concentration of zinc is high in the root, middle in the stem and leaves, low in the seed, also increased with the increase of the amount of the lake sediments.