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Nutr itive Elements Ana lysis and Eva lua tion ofMaca( L epidium m eyen ii) Cultiva ted in Yunnan Characteristics of element contents and their influence factors in Codonopsis tangshen Ana lysis on Nutr ient Character istics in the Root System ofAbies georgei var. sm ith ii in Mount Sejila of Tibet The Character istics of Nutr ient D istr ibution in the Tree Crown ofAbies georgei var . sm ith ii Forest in Mount Sejila of Tibet Bioaccumulation of Different Nutritive Elements of Leymus chinesis Steppe in Isohumisol Soil Inner Mongolia Study on moss: the content of amino acid, the feature of nutritive elements and its resistance to draught in the biotic crusts in arid and semi-arid regions Contents and Storages of Mineral Nutritive Elements in Plantations of Pinus koraiensis