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Establishment and Application of Site Index Table for Pinus tabulaeformis Plantation in the Low Elevation Area of Beijing STUDY ON PRODUCTIVITY OF ROBINIA PSEUDOACACIA PLANTATION IN LIAONING PROVINCE A Study on the Life History of Kerria chinensis and Its Encrustation Phenslogy Establishment of a Site Index Table for Quercus variabilis Natural Secondary Stand in Qinling Mountains Establishment of Site Index Table for Quercus variabilis Natural Secondary Forest in North China ESTABLISHMENT OF THE SITE-INDEX TABLE FOR PINUS TABULAEFORMIS PLANTATION AND THE RELATIONS BETWEEN THE GROWTH OF P.TABULAEFORMIS STANDS AND THEIR SITE FACTORS IN JIULONG MOUNTAIN AREA, BEIJING