| 黄河口湿地表层沉积物中磷赋存形态的分析 |
| 摘要点击 2912 全文点击 1272 投稿时间：2013-07-10 修订日期：2013-09-16 |
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| 中文关键词 黄河口湿地 沉积物 磷赋存形态 中值粒径 有机碳 |
| 英文关键词 Yellow River estuary wetland sediments sedimentary phosphorus forms median particle size organic carbon |
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| 中文摘要 |
| 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12.12~25.37 μmol·g-1，平均值为20.70 μmol·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1.15~6.74 μmol·g-1，平均值为4.27 μmol·g-1，占总磷的摩尔分数为6.35%~30.4%. |
| 英文摘要 |
| 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-1, 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%. |
