有机酸对红壤磷素潜在环境风险的影响  

Potential Environmental Risk of Phosphorus in Red Soil as Affected by Organic Acid

作　　者：王艳玲[1] 何园球[1] 李成亮[1] 

机构地区：[1]中国科学院南京土壤研究所

出　　处：《土壤通报》2008年第1期52-56,共5页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(No.40671108)资助

摘　　要：从两个方面初步探讨了有机酸对红壤磷素潜在环境风险的影响,一是有机酸对红壤固磷能力的影响,二是有机酸对红壤固定磷向液相释放的影响。研究结果表明不同类型有机酸在这两个方面的影响是不同的,以柠檬酸为代表的二羧酸可以显著减少红壤对磷的固定量,大大提高了土壤向水体释放磷的能力,增大了土磷的潜在环境风险;而以草酸为代表的三羧酸则可以不同程度上增加土壤的固磷能力,且可使已经存在于液相中的磷再次被吸附,进而减缓或消除土磷了的潜在环境风险。Potential environmental risk of phosphorus aspects： one was the change （P） of fixed P amount in red soil, in red soil as affect by organic acids was investigated in two and another was the capacity of released P amount from soil to water body. The results showed that citric acids, representative for dicaboxylic acids, significantly decreased soil fixed P amount, however enhanced the desorbable capacity of soil P from soil to water, and magnified the potential environmental risk of P in red soil. But, oxalic acid, representative for tricaboxylic acids, increased the soil fixed P amount in various degree, and it could make the P existed in solution and adsorbed by soil again, and then alleviated or eliminated the potential environmental risk of soil P.

关 键 词：有机酸 红壤 磷 潜在环境风险 

分 类 号：S153[农业科学—土壤学] X144[农业科学—农业基础科学]