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Ecological sustainability in Chang-Zhu-Tan region:a prediction study The Grey Dynamic Forecast of the Biomass of Bruguiera gymnorrhiza Stand The Selection of Grey Models for Some Tree Species in Seedling Stage THE RELATIONSHIPS BETWEEN CHLOROPHYLL-b CONCENTRATION AND RELATED ENVIRONMENTAL FACTORS OF SEAWATER IN DAPENG BAY BASED ON GREY MODEL RELATIVE ANALYSIS Spatio-temporal analysis and prediction of grain security in Shaanxi Province Temporal dynamics of phytoplankton and nutrients during red tides