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

Mao, Feng, Ullah, Sami, Gorelick, Steven M., Hannah, David M. and Krause, Stefan 2021. Increasing nutrient inputs risk a surge of nitrous oxide emissions from global mangrove ecosystems. One Earth 4 (4) , pp. 742-748. 10.1016/j.oneear.2021.04.007
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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Cell Press
ISSN: 2590-3322
Date of First Compliant Deposit: 9 June 2021
Date of Acceptance: 14 April 2021
Last Modified: 10 Jun 2021 09:45
URI: http://orca.cardiff.ac.uk/id/eprint/141828

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