不同栽培管理方式下土壤DTPA浸提态铁、锰、铜、锌含量差异分析

DTPA Exchangeable Soil Fe,Mn,Cu and Zn Contents in Different Cultivation Management

为探讨不同栽培管理方式下土壤DTPA浸提态铁(Fe)锰(Mn)铜(Cu)锌(Zn)含量的特征,采用野外采样及室内分析方法,对上海郊区大棚及露地栽培体系下有机和常规农业生产系统中土壤不同土层DTPA-Fe、Mn、Cu、Zn含量进行对比研究。结果表明,有机生产系统的DTPA-Fe、Mn、Cu、Zn含量均高于常规生产方式,露地有机园艺管理耕作层DTPA-Mn、Cu、Zn浓度高于常规管理,而DTPA-Fe则反之。统计分析结果表明,不同栽培管理方式对DTPA-Fe、Mn、Cu、Zn含量具有显著性影响,且大棚条件下更为明显。因此,不同栽培管理方式改变了土壤DTPA浸提态铁锰铜锌的分布及其特性。

The aim of this work w as to investigate the influence of different management practices on soil DTPA-extractable Fe, Mn, Cu and Zn contents in the cultivated soils. Soils under greenhouse and open field cultivation were sampled from the fields in Shanghai, China, where organic farming had been conducted for three years or conventional faming had been carried out in the same area. The results showed that the contents of soil DTPA-extractable Fe, Mn, Cu and Zn under organic management system were much larger than those under conventional management system. While soil DTPA-extractable Mn, Cu and Zn contents at 0-20 cm depth in the open field under organic management strategy were higher than those of conventional management. On the contrary, soil DTPA-Fe contents followed the different trend. ANOVA revealed that cultivation and management had a significant impact on the contents of soil DTPA-extractable Fe, Mn, Cu and Zn, especially under greenhouse condition. We concluded that the distribution and characteristics of soil exchangeable bases were changed significantly under different cultivation and management.