福建省山美水库入库河道沉积物磷释放风险  

Phosphorus release risk in the sediments in Shanmei reservoir-entering channel

作　　者：路丁[1] 郭沛涌[1] 沈芳芳[1] 沈根勇 杨攀[1] 

机构地区：[1]华侨大学化工学院环境科学与工程系,厦门361021

出　　处：《环境化学》2015年第8期1498-1505,共8页Environmental Chemistry

基　　金：国家自然科学基金(20777021);福建省自然科学基金(2011J05112;2014J01049);泉州市重点科学技术项目(2014Z110;2012Z85);晋江市重点科学技术项目(2013S002)资助

摘　　要：通过沉积物磷赋存形态,沉积物-水界面磷吸附平衡浓度(EPC0)值与上覆水体可溶性活性磷(SRP)的大小关系,沉积物磷吸附指数(PSI)、磷吸附饱和度(DPS)、以及其衍生出的磷释放风险指数(ERI)探讨了福建省山美水库入库河道沉积物磷的潜在释放风险.结果表明,入库河道沉积物总磷(TP)、无机磷(IP)、有机磷(OP)、非磷灰石磷(NAIP)及磷灰石磷(AP)的平均含量分别为837.12、665.94、167.19、497.63 mg·kg-1以及166.21 mg·kg-1,各形态磷占TP的比例分别为79.6%、20.0%、59.4%以及19.8%,其沉积物TP含量高于东昌湖,低于百花湖、海河及滇池.入库河道沉积物磷的主要赋存形态为NAIP,为沉积物较易释放且可被生物利用的磷;入库河道沉积物EPC0平均值为0.125 mg·L-1,显著高于上覆水体SRP(0.026 mg·L-1);入库河道沉积物PSI的平均含量为58.01(mg P/100g)·(μmol·L-1)-1,DPS的平均值为14.79%,其衍生指数(ERI)平均值为33,处于沉积物磷高释放风险的范畴.综上可见,山美水库入库河道沉积物磷存在潜在的高释放风险.In this study,the release risk of phosphorus from sediments in Shanmei reservoir-entering channel,located in Fujian province,was evaluated by the following parameters： the phosphorus fraction,relationship between the equilibrium concentration of phosphorus adsorbed at the interface of sediment and water（ EPC0） and the concentration of soluble reactive phosphorus（ SRP） in the overlying water,the phosphorus sorption index（ PSI）,the degree of phosphorus saturation（ DPS）and finally the calculated value of P-induced lake eutrophication risk index（ ERI）. The results showed that the content of TP,IP,OP,NAIP,and AP was 837. 12,665. 94,167. 19,497. 63,166. 21 mg·kg- 1,respectively. Different forms of phosphorus accounted for 79. 6%,20. 0%,59.4%,and 19. 8%,respectively. The content of TP was higher than that in Dongchang Lake,and lower than that in Baihua Lake,Haihe river and Dianchi Lake. The major form of phosphorus in the sediments was NAIP,which was easy to be released and had bio-availability. EPC0（ 0.125 mg·L- 1） was significantly higher than SRP（ 0. 026 mg·L- 1）. The content of PSI was 58.01（ mg P/100g）·（ μmol·L- 1）- 1,and the content of DPS was 14. 79%. ERI in the sediments was 33,and it could be translated by the high release risk of phosphorus. In conclusion,all these parameters indicated that phosphorus had a high release risk from sediments in Shanmei reservoir-entering channel.

关 键 词：沉积物 磷分级 EPC0 PSI和DPS 

分 类 号：X524[环境科学与工程—环境工程]