Effect of EDTA,fulvic acid and acetate addition on microbial iron reduction in paddy soils
Dong Qu · Xibei Nong-Lin Keji Daxue xuebao. Ziran kexue ban · 2003
Under the anaerobic condition,the influence of EDTA,fulvic acid and acetate that were added into four different paddy soils on iron reductions were determined,in order to discuss the ability of microbial iron reduction in the different soil,the addition of artificial Fe(OH) 3 is used as the contrast.The results suggested that the addition of fulvic acid and sodium acetate gave rise to the influence of iron reduction,which was reflected differently in the different soil.The change of Jilin and Guangdong soil was very obvious and the function of acetate was more than that of fulvic acid.At the same time in the Sichuan and Jiangxi soil the addition of fulvic acid and acetate gave rise to the influence of iron reduction,which was not different to the contrast.The addition of Fe(OH) 3 into Jilin soil could gives rise to the hysteresis of iron reduction,but at last its quantity of iron reduction,compared with the contrast,was increased obviously,which was similar to that of Sichuan and Jiangxi soil.Under the 25 ℃ incubation,in the different soil the quantity of ferric oxide which could be easily deoxidized,was different,which showed that the Jilin soil is the most,the Sichuan soil is the second,the Guangdong soil is the third,and the Jiangxi soil is the least.The Guangdong soil had a very strong potential ability of iron reduction.