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Studies on Fertilization of Young Acer truncatum Bunge Ⅱ. Effect on Flavonoid,Cholorogenic Acid and Nutrition Elements in Leaves Comparison of phosphorus uptake and accumulation capacity among three plant species Dynamic characterization of iodine uptake in vegetable plants Analyses of the Contents of Elements of Five Mosses and Their Substrates in Tongshankou Copper Mine, Hubei Province, China A Study of Chemical Contents in a Mixed Shrubland Near Baihuashan Mountain in Beijing Heavy Metal Contents in Four Mosses at Two Copper Mines in Northwest Guizhou,China