| 南四湖微山湖区沉积物磷形态分布特征 |
| 摘要点击 7946 全文点击 3264 投稿时间：2008-06-04 修订日期：2008-09-15 |
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| 中文关键词 沉积物 磷 形态分布 南四湖 微山湖区 |
| 英文关键词 sediment phosphorus species distribution Lake Nansihu Weishanhu district |
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| 中文摘要 |
| 为了解南四湖污染底泥磷形态分布规律，对南四湖微山湖区0～25 cm沉积物分层进行了磷形态连续提取.结果表明，湖区沉积物中Ex-P、Al-P、Fe-P、Oc-P、Ca-P、De-P和Org-P平均含量分别为5.62、 4.08、 12.25、 13.34、 116.67、 232.36和396.79 mg/kg，不同形态磷含量次序为：Al-P＜Ex-P＜Fe-P＜Oc-P＜Ca-P＜De-P＜Org-P.沉积物中各形态磷含量在垂直方向上呈现明显的规律性，易交换态磷（Ex-P）、铁结合态磷（Fe-P）、闭蓄态磷（Oc-P）、有机磷（Org-P）含量随深度增加而逐渐降低，而铝结合态磷（Al-P）、钙结合态磷（Ca-P）、碎屑磷（De-P）含量则呈逐渐增加趋势.Sum1（Ex-P、Al-P、Fe-P之和）与上覆水PO3-4浓度呈显著正相关，其中Fe-P与水体磷酸盐含量关系相对比较密切，其相关系数高达0.72.沉积物磷形态在空间分布上，Oc-P、Ca-P、De-P 等惰性磷的差异性小于Ex-P、Al-P、Fe-P等潜在活性磷，Org-P介于二者之间. |
| 英文摘要 |
| In order to learn the phosphorus(P) species distribution in sediments of Lake Nansihu, 0-25 cm sediments from Weishanhu district in Lake Nansihu were analyzed with a sequential extraction method．The results show that: the average values of Ex-P, Al-P, Fe-P, Oc-P, Ca-P, De-P, Org-P in Weishanhu district sediments are 5.62 mg/kg, 4.08 mg/kg, 12.25 mg/kg, 13.34 mg/kg, 116.67 mg/kg, 232.36 mg/kg and 396.79 mg/kg respectively, and the rank order of P-fractionation for Lake Nansihu is Al-P＜Ex-P＜Fe-P＜Oc-P＜Ca-P＜De-P＜Org-P. The vertical phosphorous species distribution exhibits the obvious rule that exchangeable P(Ex-P), Fe-bound P(Fe-P), occluded P(Oc-P), organic P(Org-P) value decrease with depth, while the values of Al-bound P(Al-P), authigenic calcium bound P (ACa-P), detrital apatite P(De-P) increase. The Sum1 content (the sum of Ex-P, Al-P and Fe-P) in surficial sediments is remarkably positively correlated with the PO3-4 concentration of overlaying water, to which Fe-P content contributes the most with the correlation index 0.72. In spatial phosphorous species distribution, the discrepancy of potential active species(Ex-P, Al-P and Fe-P) is greater than those inert ones(Oc-P, Ca-P and De-P), and Org-P is only second to those potential active species. |
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