Study on Biological Characteristics of Bamboo Shooting from Base of Sympodial Bamboo Buds Effects ofFloor-covering Material on the Shoot Production in the Stands of Phylostachs praecox Chu et Chao STUDIES ON THE PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF LEAVES OF DENDROCALAMOPSIS OLDHAMII DURING SHOOT GROWING Some Physiological Characteristics of the Leaves of Dendrocalamopsis vario-striata during Shooting