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Ecological thresholds: Concept, methods and research outlooks The Multi-dimensional thresholds of sediment yield in the area with abundant and coarse sediment on the Loess Plateau Research on the habitat condition of phytoplankton community’s restoration in Suzhou Creek Scenarios simulation and indices thresholds determination of ecological security in three gorges reservoir based on system dynamics Alleviation effect of exogenous Ca,P and N on the growth of Chinese fir seedlings under Al stress Grazing resistance of rangeland plants Research on the application of natural ecological restoration in a typical region of China with red soils Threholds in vegetation-precipitation relationship and the implications in restoration of vegetation on the Loesee Plateau,China Threshold Effect of Photosynthesis in Forsythia suspense to Soil Water and its Photosynthetic Productivity Grading in Spring and Summer Impacts of roads on woodland landscape connectivity：a case study of Gongyi City, Henan Province RESEARCHES ON THE THRESHOLD OF ALUMINUM TOXICITY AND THE DECLINE OF CHINESE FIR PLANTATION IN HILLY AREA AROUND THE SICHUAN BASIN