Which nitrogen-related process is enhanced in connected wetlands?

Which nitrogen-related process is enhanced in connected wetlands?

• A. Nitrification
• B. Denitrification
• C. Nitrogen fixation
• D. Mineralization

Answer: (B)

Denitrification is enhanced in connected wetlands because the hydrologic link to other water bodies brings nitrate into the system while the saturated, low-oxygen soils create anaerobic pockets where denitrifying microbes thrive. In these conditions, bacteria use nitrate as an electron acceptor and convert it to nitrogen gas (N2) or nitrous oxide (N2O), effectively removing bioavailable nitrogen from the ecosystem. The connection to streams or rivers also supports ongoing nitrate supply and ample organic carbon, both of which boost denitrification rates. This contrasts with nitrification, which needs oxygen and is less active in flooded soils; nitrogen fixation introduces new nitrogen from atmospheric N2 independent of these wetlands' connectivity; and mineralization mainly releases ammonium from organic matter without requiring the anaerobic conditions that favor denitrification.

Denitrification is enhanced in connected wetlands because the hydrologic link to other water bodies brings nitrate into the system while the saturated, low-oxygen soils create anaerobic pockets where denitrifying microbes thrive. In these conditions, bacteria use nitrate as an electron acceptor and convert it to nitrogen gas (N2) or nitrous oxide (N2O), effectively removing bioavailable nitrogen from the ecosystem. The connection to streams or rivers also supports ongoing nitrate supply and ample organic carbon, both of which boost denitrification rates. This contrasts with nitrification, which needs oxygen and is less active in flooded soils; nitrogen fixation introduces new nitrogen from atmospheric N2 independent of these wetlands' connectivity; and mineralization mainly releases ammonium from organic matter without requiring the anaerobic conditions that favor denitrification.