Increasing nutrient inputs risk a surge of nitrous oxide emissions from global mangrove ecosystems

Feng Mao, Sami Ullah, Steven M. Gorelick, David M. Hannah, Stefan Krause

Research output: Contribution to journalArticlepeer-review

Abstract

We document a substantial increase in global N2O emissions from mangroves. Based on our analysis of two decades of mangrove N2O emission studies, we estimate N2O emission of 0.023 Tg N year−1 from global mangrove ecosystems. N2O fluxes from mangrove ecosystems are strongly increased by sediment dissolved inorganic nitrogen (DIN) concentration transported from river catchments to coastal waters. Continuing growth of nutrient inputs from anthropogenic sources, i.e., agricultural intensification, excessive fertilizer use and waste water discharge, will appreciably increase DIN loading and consequently global N2O emission from mangroves. Based on the Millennium Ecosystem Assessment scenarios of riverine DIN inputs into mangrove ecosystems coupled with our estimates of DIN-controlled emissions rates, we expect N2O emission to increase by 20%–51% by 2030 and 27%–74% by 2050 compared with estimated emissions in the year 2000. These forecasts underline the urgency of improvements in catchment-scale nitrogen management strategies.

Original languageEnglish
Pages (from-to)742-748
Number of pages7
JournalOne Earth
Volume4
Issue number5
Early online date11 May 2021
DOIs
Publication statusPublished - 21 May 2021

Keywords

  • climate change
  • emissions
  • greenhouse gas
  • mangroves
  • nitrous oxide
  • nutrients
  • river catchments

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences (miscellaneous)

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