Contributions of phosphatase and microbial activity to internal phosphorus loading and their relation to lake eutrophication

作     者：SONG Chunlei, CAO Xiuyun, LI Jianqiu, LI Qingman, CHEN Guoyuan & ZHOU Yiyong Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 

作者机构：Institute of Hydrobiology Chinese Academy of Sciences Wuhan China Graduate School of the Chinese Academy of Sciences Beijing China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2006年第49卷第Z1期

页      面：102-113页

核心收录：

学科分类：08[工学] 0708[理学-地球物理学] 0815[工学-水利工程] 0704[理学-天文学] 

基　　金：supported by the Chinese Academy of Sciences(CAS)(Grant No.KZCX1-SW-12-Ⅱ-02-02) the National Natural Basic Research Program of China(Grant No.2002CB412304) the National Natural Science Foundation of China(Grant No.20177033) the funds(Grant No.2002AA601013) 

主　　题：dissolved phosphatase, reverse micelle, internal loading, phosphorus form of sediment, microbiology, eutrophication, Microcystis bloom. 

摘      要：Phosphatase may accelerate the process of lake eutrophication through improving phosphorus bioavailability. This mechanism was studied in three Chinese eutrophic shallow lakes (Lake Taihu, Lake Longyang and Lake Lianhua). Phosphatase activity was related to the concentration of soluble reactive phosphorus (SRP) and chlorophyll a. Stability of dissolved phosphatase in reverse micelles may be attributed to molecular size, conformation and active residues of the *** the site with Microcystis bloomed in Lake Taihu, dissolved phosphatase activity was higher and more stable in micelles, SRP concentrations were lower in interstitial water, the contents of different forms of phosphorus and the amounts of aerobic bacteria were lower while respiration efficiency was higher in sediments. Phosphobacteria, both inorganic and organic and other microorganisms were abundant in surface water but rare in sediments. Therefore, internal phosphorus may substantially flux into water column by enzymatic hydrolysis and anaerobic release, together with mobility of bacteria,thereby initiating the bloom. In short, biological mechanism may act in concert with physical and chemical factors to drive the internal phosphorus release and accelerate lake eutrophication.