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Advancesin ecosystem service-based ecological risk assessment Analysis of the ecosystem structure and energy flow of the Yangtze River estuary and adjacent seas, based on the Ecopath model Comparative study on the changes of the Bohai Sea ecosystem structure based on Ecopath model between ten years Ecosystem dynamics in the ‘Returning Rangeland to Grassland’ programs, China Modeling Structural and Functional Responses of Terrestria Ecosystems in China to Changes in Climate and Atmospheric CO2 ANATOMICAL STUDIES ON OROSTACHYS FIMBRIATUS FROM CRASSULACEAE Comparison of Stem Structures of Eight Mosses in Two Habitats