1. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China; Institute of Hydrobiology, Chinese Academy of Sciences; Donghu South Road 7 Wuhan 430072 People's Republic of China
2. Basic Chemistry Experimental Center; Nanchang University; Nanchang Jiangxi 330031 People's Republic of China
3. University of Chinese Academy of Sciences; Beijing 100049 People's Republic of China