Nitrogen loss from the coastal shelf of the East China Sea: Implications of the organic matter br

Organic matter is a critical factor which regulates nitrogen loss pathways of denitrification and anammox for microbesin marine ecosystems. However, only a little attention has been paid to contrasting studies on denitrification andanammox in sandy and muddy sediments, especially in the coastal continental shelf dominated by sandy sediments.This study determined the bulk properties and associated microbial nitrogen transformation processes of surface sed-iments in the East China Sea coastal shelf, with the aim of gaining insight into the interaction of nitrogen loss with or-ganic matter at the molecular level. The results illustrate that nitrogen loss dominates in organic-rich muddysediments, and its denitrification rate (14.39 nmol N g-1h-1) and anammox rate (2.73 nmol N g-1h-1) are greaterthan those of sandy sediments (denitrification rate = 5.55 nmol N g-1h-1, anammox rate = 1.57 nmol N g-1h-1).Furthermore, determination of the mean summed ladderanes shows higher anammox generated in the muddy sedi-ments with a value of 167.78 ng g-1dw. Quantitative analysis demonstrated that organic-rich muddy sediments en-hanced the copy number of the denitrifying functional genenosZand anammox functional genehzsB. We inferredthat the greater rate of nitrogen loss in muddy sediments was due to the coupling relationship between anammoxand denitrification. Overall, the community distribution and abundance of denitrifying bacteria and anammox bacte-ria changed intricately under the influence of organic matter. Moreover, this study further improves the understanding of nitrogen loss pathways and mechanistic factors from sediments