摘要
采用适于研究石灰性土壤中锌形态的分组方法,利用盆栽试验研究锌在土壤中的动态及有效性。结果表明,水溶性锌施入土壤后,大部分(77%以上)迅速转化为碳酸盐结合态和三二氧化物结合态,前者又向残渣态转化。种植玉米可促进碳酸盐结合态和三二氧化物结合态向残渣态转化;土壤各组分锌之间存在着相互转化、相互依赖的平衡关系。本文同时对各种形态锌的有效性提出了某些看法。
The fractionation method of soil zinc and the pot experiment was used to study the transformation and availability of both native and applied zinc in soil.The results showed that soluble zinc applied to soil transforms largely to CA-Zn(carbonate bound)and R_2O_3-Zn(Al-oxide and Fe-oxide bound), and CA-Zn could transform to RES-Zn (residual form).Corn plant was able to uptake CA-Zn partially and promotes transformation of CA-Zn and R_2O_3- Zn to RES-Zn.Different fractions of soil zinc depended on and transformed to each other.The CA-Zn was correlated with available zinc (DTPAZn)and a portion of CA-Zn was available to plant.
关键词
锌
土壤
转化
有效性
zinc
soil
availability
transformation
