不同有机物料与外源锌对土壤锌形态及生物有效性的影响

Effects of Different Organic Materials and Exogenous Zn on Zn Distribution in Soil

采用二因素完全组合盆栽试验研究了施入不同有机物料与不同外源锌浓度对土壤全锌、有效锌、锌形态分布以及小白菜中锌含量分布的影响。结果表明:土壤全锌、有效锌和各锌形态含量都是随着外源锌浓度的增加而增加。草坪草和玉米秸可以有效降低土壤全锌,提高土壤中有效锌和非残留态锌的含量,促进小白菜对锌的吸收;鸡粪、猪粪和牛粪显著提高土壤全锌、有效锌和非残留态锌含量,使得土壤锌的活性增强,显著促进了小白菜对锌的吸收;而泥炭和风化煤能有效提高土壤有机结合态锌和残留态锌的含量,降低全锌和有效锌含量,对土壤锌起到钝化作用,未促进小白菜对锌的吸收。随着锌浓度的增加,锌在小白菜根部富集量增加。

A pot experiment with a complete combinatorial design of two factors was conducted to study the effects of different organic materials and different concentrations of exogenous zinc on the soil total zinc, available zinc, zinc forms and zinc content distribution of pak-choi. The results showed that the total zinc, available zinc, and different forms of zinc contents in soil all increased as the concentration of exogenous zinc increased. Both lawn grass and maize straw decreased the total zinc, increased the available zinc and no-residual zinc in soil effectively, and promoted the accumulation of zinc in pak-choi. Chicken manure, pig manure, and cattle manure improved the total zinc, available zinc and no-residual zinc in soil significantly, and enhanced the activity of zinc in soil, and promoted the accumulation of zinc in pak-choi significantly. Peat and weathered coal both increased the organic zinc and residual zinc in soil effectively, decreased the total zinc and available zinc, showing the passivating effect to zinc of soil, and failed to promote the accumulation of zinc in pak-choi. The concentration of zinc in pak-choi root increased as the concentration of exogenous zinc increased.