Cold seep nitrogen fixation and its potential relationship with sulfur cycling.

ABSTRACT: Dinitrogen (N₂) fixation is a crucial source of bioavailable nitrogen in carbon-dominated cold seep systems. Previous studies have shown that diazotrophy is not necessarily dependent on sulfate-dependent anaerobic oxidation of methane for energy, and diverse catabolism can fuel the high-energy-demanding process in sediments. However, it remains unclear whether diazotroph can obtain energy by sulfur oxidation in sulfur-rich cold seep water column. Here, field investigations and in situ experiments were conducted in Haima cold seep to examine the effects of diverse sources of dissolved organic matter (DOM) on N₂ fixation, specifically containing sulfur, carbon, nitrogen, and phosphorus. We found that active N₂ fixation occurred in the water column abov

SUBMITTER: Quan Q 

PROVIDER: S-EPMC11448218 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature