黄河口湿地表层沉积物中磷赋存形态的分析  

Distribution of Phosphorus in Surface Sediments from the Yellow River Estuary Wetland

作　　者：于子洋[1] 杜俊涛[1] 姚庆祯[1] 陈洪涛[1] 于志刚[1] 

机构地区：[1]中国海洋大学海洋化学理论与工程教育部重点实验室,青岛266100

出　　处：《环境科学》2014年第3期942-950,共9页Environmental Science

基　　金：山东省自然科学基金项目(ZR2010DM003);国家自然科学基金项目(41276070)

摘　　要：于2009年4月在黄河口湿地采集表层沉积物，利用改进后的SEDEX方法对沉积物样品进行了磷形态的分析．结果表明，表层沉积物中总磷含量变化范围为12．12-25．37tzmol·g^-1，平均值为20.70μmol·g^-1，其中自生磷灰石磷和碎屑磷灰石磷为表层沉积物中磷的主要赋存形式．中值粒径与各形态磷含量密切相关，弱吸附态磷、自生磷灰石磷、活性有机磷含量与中值粒径呈显著负相关关系；碎屑磷灰石磷含量与中值粒径呈显著正相关关系．有机质含量影响各形态磷在沉积物中含量，弱吸附态磷、活性有机磷、自生磷灰石磷含量均随TOC含量增加而升高．包括弱吸附态磷、活性有机磷和铁结合态磷在内的生物可利用磷含量变化为1．15-6．74μmol·g^-1，平均值为4．27μmol·g^-1，占总磷的摩尔分数为6．35％-30．4％．Surface sediments were collected from Yellow River estuary wetland. The distribution of phosphorus in sediments was analyzed with modified SEDEX. The results indicated that the contents of TP in surface sediments varied from 12.12 μmol.g^-1 to 25.37 μmol.g^-l , and the mean value was 20. 70 μmol.g^-1 , in which the Detrital P and Authigenic P were the main forms. Median particle size was closely related with the distribution of phosphors, Exchangeable P, Authigenic P and Organic P mainly consisted of smaller sediment size, while Detrital P mainly consisted of larger sediment size. The distribution of P in sediment was affected by organic matter. Exchangeable P, organic P and refractory P increased with the increasing TOC. The bio-available phosphorus included exchangeable P, iron-bound P,organic P and ranged from 1.15-6.74 μmol.g^-1, with an average of 4.27 μmol.g^-1 for all sediment samples. The contribution of BAP to TP was 6.35% -30.4%.

关 键 词：黄河口湿地 沉积物 磷赋存形态 中值粒径 有机碳 

分 类 号：X131[环境科学与工程—环境科学]