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TREE HEIGHT ANALYSIS IN 14-YEAR-OLD PINUS TABULAEFORMIS CARR. STANDS Numerical analysis of interspecific relationships in communities of Larix chinensis in Qinling Mountain Grassland Community Structure and Interspecies Relationships in Nalati Pasture Interspecific relationships of major species in Ammoden-dron argenteum communities of Takeermohuer Desert Ecological Species Groups of Wetland Vegetation on Lianbotan in Fen River, Shanxi