YANG Wen-lan1, 2, JIANG Gong-cheng2, WANG Zhao-qun3, ZHANG Shu-hai3, HUANG Hui1,2

( 1.School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huaian 223300, China; 2. Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Lake Hongze , Huaian 223300, China; 3. Huaian Environmental Monitoring Center, Huaian 223300, China)

Abstract: 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 .

Key words: Lake Hongze; sediment; phosphorus form; distribution

EARTH AND ENVIRONMENT Vol. 41, No.1, Tot No.291, 2013, Page 43-49