Depth-related variability of diazotrphic community in mangrove sediment

Nitrogen-fixing microorganisms (diazotrophs) provide biological available nitrogen to mangrove species and thereby greatly influence the extent of nitrogen limitation in mangrove ecosystem. To better understand the depth-related variability of biological nitrogen fixation and its driven facotr, we compared the diazotrophic community in ten mangrove sediment depths (0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, 40-50 cm, 50-60 cm, 60-70 cm, 70-80 cm, 80-90 cm, 90-100 cm).