Abstract: To study bacterial diversity in Nansha deep-sea sediments, a total of 565 clones from three Nansha deep-sea sediments were sequenced using 16S ribosomal DNA (rDNA) clone library method. The results showed that the bacterial communities from three deep-sea sites covered 10 phyla: Proteobacteria, Planctomycetes, Actinobacteria, Nitrospira, Chloroflexi, Acidobacteria, Spirochaetes, Bacteroidetes, Verrucomicrobia and Firmicutes. The predominant group in these three deep-sea sediments included Proteobacteria, Planctomycetes and Actinobacteria, which was different from the dominant group in land and marine microbiology. The above results suggested that microbial diversity of Nansha marine sediments was rich.

Key words: Nansha, deep-sea sediments, bacterial diversity