I have been devoted to the teaching and research of ecology for over 15 years. The previous studies mainly focus on the animal biology. The research results have been published on international journals like "General and Comparative Endocrinology", "Animal Biology" and "Aquaculture" as well as domestic journals like "Acta Ecologica Sinica", "Journal of Zhejiang University (Science Edition)", "Chinese Journal of Applied & Environmental Biology" and others. In recent years, my research field has turned to the environmental ecology, which has become my research focus during the period of pursuing my doctoral degree. And this paper is one of my research results.