Alkaline phosphatase activity and the phosphorus mineralization rate of Lake Taihu

作     者：GAO Guang, ZHU Guangwei, QIN Boqiang, CHEN Jun & WANG Ke Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China Hohai University, Nanjing 210098, China 

作者机构：Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing China Hohai University Nanjing 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：176-185页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：2002CB412305 2002AA601011-04-07 Chinese Academy of Sciences,CAS: KZCX1-SW-12 

主　　题：Lake Taihu, alkaline phosphatase, kinetic parameters, phosphorus, mineralization rate. 

摘      要：The phosphorus fractions, the alkaline phosphatase activity (APA) and other water chemical parameters were concomitantly monitored from April 2003 to October 2004 in different ecotype sites of Lake Taihu. During the stages of algae growth, the phosphorus fractions and their relationships with APA in different ecotype sites were discussed and the phosphorus mineralization rate was calculated. In the water of Lake Taihu, most of the phosphorus (70.2%) could be attributed to the suspended particulate phosphorus, while the dissolved reactive phosphorus (DRP) seems to contribute less than 7%. About 58% of the total phosphorus, however, can be hydrolyzed as inorganic phosphate to compensate for phosphorus deficiency of algae and bacteria growth. During the different algae growth stages, the APA and its Kinetic parameters were varied significantly between different ecotype sites of Lake Taihu. This trend is also visible by comparing the phosphorus mineralization rate,and the most rapidly phosphorus turnover time is only several minutes. The fast recycle of phosphorus can, to some extent, be explained that the phosphorus source of algal blooms. The phytoplankton seems to compensate for phosphorus deficiency by using the alkaline phosphatase to hydrolyze phosphomonoesters.