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A STUDY ON DYNAMICS OF Fe,Cu,Mn,Zn IN PRIMARY PRODUCTION OF SPARTINA ALTERNIFLORA Huia Recurvata --- A New Plant from Lower Devonian of Southeastern Yunnan China, A PHYTOCOENOLOGICAL STUDY ON THE EMERGENT VEGETATION IN FUTOU LAKE Ⅱ. THE STRUCTURE OF COM. NELUMBO NUCIFERA RESEARCHES ON BIOMASS AND NUTRIENTACCUMULATION OF UNDERSTOREY IN THE SECONDGENERATION OF YOUNG CHINESE FIR PLANTATION Ⅱ．ACCUMULATION AND DISTRIBUTION OF NUTRIENT ELEMENTS IN UNDERSTORY