Depth-related variability of biological fixation and its downstream nitrogen cycling processes in mangrove sediment

Biological nitrogen fixation not only provides reactional substrates for its downstream nitrogen cycling processes, but also is a critical process to alleviate the nitrogen limitation. To better understand the depth-related variability of biological nitrogen fixation and its downstream processes, we compared the abundance of functional genes invloved in these nitrogen cycling processes in three representative mangrove sediment depths (0-10 cm, 50-60 cm, 90-100 cm)