A Simulation Model for the plant-Environmental System of Alkalized Grassland on Songnen Plain in Northeast China Research Progress in the Estimation Models of Grassland Net Primary Productivity Study on Shortern Forecast of Micromelopha troglodyta GROWTH AND YIELD MODELS FOR CHINESE WHITE POPLAR Plant similarity studies within different summer corn populations SDLP method on optimization of regional agricultural resource allocation Degradation of Phytosteril Into Androstenedione by Mycobacterium SP-UV-8 Advances in studies on mathematical models of sustained and controlled release systems for oral preparations Theoretical and applied studies on predator-prey interaction Studies on the inhibition of vetiver oil to freshwater algae