DIVERSE ECOSYTEM SERVICES AND COMPLEX AGRICULTURAL ECOSYSTEM

Study of Ecosystem service function appeared as a heated research issue in ecology research in 1970s,In this paper,the author proposed a framework for ecosystem services classification and explain a defini- tion of ecosystem connotations with 10 items,for the first time.The ecological analysis on agricultural ecosystem complexity and ecosystem service diversity highlighted the necessity of maintaining multi-scale diversities in the complex agricultural ecosystem for its sustainable diverse ecosystem services.