Diversity and plant growth-promoting potential of bacterial endophytes of Alpinia Officinarum Hance, a famous south-China medicinal plant Culture-dependent and culture-independent approaches to studying soil microbial diversity Isolation and Identification of Endophytic Bacteria in Leaf from Xiangshan Smoke Tree(Cotinus coggygria var. cinerea#br#) Bacterial diversity of the sediment from Cangnan Large Fishing Bay