Seasonal variation in nitrous oxide and methane emissions from subtropical estuary and coastal mangrove sediments, Australia

Allen, D., Dalal, R. C., Rennenberg, H. and Schmidt, S. (2011) Seasonal variation in nitrous oxide and methane emissions from subtropical estuary and coastal mangrove sediments, Australia. Plant Biology, 13 1: 126-133. doi:10.1111/j.1438-8677.2010.00331.x


Author Allen, D.
Dalal, R. C.
Rennenberg, H.
Schmidt, S.
Title Seasonal variation in nitrous oxide and methane emissions from subtropical estuary and coastal mangrove sediments, Australia
Journal name Plant Biology   Check publisher's open access policy
ISSN 1435-8603
1438-8677
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1111/j.1438-8677.2010.00331.x
Volume 13
Issue 1
Start page 126
End page 133
Total pages 8
Editor H. Rennenberg
J. T. M. Elzenga
Place of publication Oxford, U.K.
Publisher Blackwell
Collection year 2011
Language eng
Subject C1
829802 Management of Greenhouse Gas Emissions from Plant Production
050303 Soil Biology
Formatted abstract
Mangrove sediments can act as sources of the greenhouse trace gases, nitrous oxide (N2O) and methane (CH4). Confident reporting of trace gas emissions from mangrove sediments at local levels is important for regional emissions inventories, since small changes in N2O and CH4 fluxes greatly influence greenhouse gas budgets due to their high global warming potentials. It is also important to identify the drivers of trace gas emission, to prioritise management for minimising emissions. We measured N2O and CH4 fluxes and abiotic sediment parameters at midday low tide in winter and summer seasons, at four sites (27°33′S, 152°59′E) ranging from estuary to ocean sub-tropical mangrove sediments, having varied anthropogenic impacts. At all sites, sediment N2O and CH4 emissions were significantly lower during winter (7–26 μg N2O m−2·h−1; 47–466 μg CH4 m−2·h−1) compared to summer (28–202 μg N2O m−2·h−1; 247–1570 μg CH4 m−2·h−1). Sediment temperature, ranging from 18 to 33 °C, strongly influenced N2O and CH4 emissions. Highest emissions (202 μg N2O m−2·h−1, 1570 μg CH4 m−2·h−1) were detected at human-impacted estuary sites, which generally had higher total carbon (<8%) and total nitrogen (<0.4%) in sediments and reduced salinity (<16 dS·m−1). Large between-site variation highlights the need for regular monitoring of sub-tropical mangroves to capture short-lived, episodic N2O and CH4 flux events that are affected by sediment biophysico-chemical conditions at site level. This is important, particularly at sites receiving anthropogenic nutrients, and that have variable freshwater inputs and tidal hydrology.
© 2010 German Botanical Society and The Royal Botanical Society of the Netherlands.

Keyword Anthropogenic inputs
Global warming
Greenhouse gases
Salinity
Tidal estuary
Wetland
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 4 MAR 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
 
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Created: Thu, 16 Sep 2010, 09:59:10 EST by Joni Taylor on behalf of School of Biological Sciences