地球与环境

文章摘要

洪泽湖不同湖区表层沉积物中磷的形态和分布特征

Chemical Forms and Distribution of Phosphorus in Surface Sediments of Lake Hongze

投稿时间：2012-03-13 修订日期：2012-10-09

DOI：

中文关键词: 洪泽湖;沉积物;磷形态;分布

英文关键词: Lake Hongze;sediment;phosphorus form;distribution

基金项目:江苏省高校自然科学基金资助项目(09KJD610001);淮安市科技支撑计划资助项目(HAS2009019)。

作者	单位
杨文澜^1,2, 蒋功成², 王兆群³, 张书海³, 黄辉^1,2	1. 淮阴师范学院化学化工学院, 江苏淮安 223300 2. 江苏省环洪泽湖生态农业生物技术重点实验室, 江苏淮安 223300 3. 淮安市环境监测中心站, 江苏淮安 223300

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中文摘要:

采用七步连续提取法对洪泽湖9个不同湖区的表层沉积物中总磷(TP)、有机磷(OP)及各种无机磷(IP)形态进行了分析,结果表明,所测洪泽湖表层沉积物中TP含量范围为630.6~1403.4 mg·kg^-1,以IP为主,占TP含量的67.7%~83.6%;OP含量占TP含量的16.4%~32.3%。受淮河、濉河河水注入的影响,所研究沉积物中TP、IP和OP含量的最大值均出现在靠近入湖口的临淮乡区。IP分为6种形态磷,即交换态磷(Ex-P)、铝结合磷(Al-P)、铁结合磷(Fe-P)、闭蓄态磷(Oc-P)、自生钙磷(ACa-P)和碎屑钙磷(De-P),其中以De-P为主,其次是Fe-P,分别占TP的25.1%~37.3%和18%~35.5%,Ex-P、ACa-P和Al-P含量相对较低,Oc-P含量最低。Ex-P、Al-P和Fe-P作为洪泽湖表层沉积物中潜在的生物可利用磷,其总量占TP的22.5%~41.7%。相关分析表明,TP与IP之间存在着极显著的相关性,与OP的相关性较差,表明沉积物中TP的含量主要是由IP控制。

英文摘要:

Total P (TP), organic P (OP) and different forms of inorganic P (IP) were analyzed by using the seven-step sequential extraction method in different sediments from Lake Hongze. Distribution characteristics of P in different sections and its impact on the natural water column were discussed. The results indicated that the contents of TP in all sediment samples range from 630.6~1403.4 mg·kg^-1 and IP is its dominant portion, accounting for 67.7%~83.6% of TP. OP accounts for 16.4%~32.3% of TP. Their maxima all appear in Linhuai Township near the entrance of the Huai River and Sui River to Lake Hongze. IP includes six forms of phosphorus:exchangeable P (Ex-P), aluminum-bound P (Al-P), iron-bound P (Fe-P), occluded P (Oc-P), authigenic carbonate-bound P (Ca-P) and detrital P (De-P). De-P and Fe-P were found to be the major components of IP whose contents are 25.1%~37.3% and 18%~35.5% of TP, respectively. The contents of Ex-P, ACa-P and Al-P are all lower and those of Oc-P are lowest. Correlation analysis showed that TP is positively correlated with IP and poorly correlated with OP. IP strongly influences the contents of TP in sediments.

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