NDLI: Nitrous Oxide Emissions from Intertidal Zone of the Yellow River Estuary in Autumn and Winter During 2011

Content Provider	Springer Nature Link
Author	Sun, Wenguang Sun, Zhigao Mou, Xiaojie Sun, Wanlong Hu, Xingyun
Copyright Year	2016
Abstract	Much uncertainty exists in spatial and temporal variations of nitrous oxide (N$_{2}$O) emissions from coastal marshes in temperate regions. To investigate the spatial and temporal variations of N$_{2}$O fluxes and determine the environmental factors influencing N$_{2}$O fluxes across the coastal marsh dominated by Suaeda salsa in the Yellow River estuary, China, in situ measurements were conducted in high marsh (HM), middle marsh (MM), low marsh (LM), and mudflat (MF) in autumn and winter during 2011–2012. Results showed that mean N$_{2}$O fluxes and cumulative N$_{2}$O emission indicated intertidal zone of the examined marshes as N$_{2}$O sources over all sampling seasons with range of 0.0051 to 0.0152 mg N$_{2}$O m$^{−2}$ h$^{−1}$ and 7.58 to 22.02 mg N$_{2}$O m$^{−2}$, respectively. During all times of day and the seasons measured, N$_{2}$O fluxes from the intertidal zone ranged from −0.0004 to 0.0644 mg N$_{2}$O m$^{−2}$ h$^{−1}$. The freeze/thaw cycles in sediments during early winter (frequent short-term cycle) and midwinter (long-term cycle) were one of main factors affecting the temporal variations of N$_{2}$O emission. The spatial variations of N$_{2}$O fluxes in autumn were mainly dependent on tidal fluctuation and plant composition. The ammonia-nitrogen (NH$_{4}$ $^{+}$–N) in sediments of MF significantly affected N$_{2}$O emissions (p < 0.05), and the high concentrations of Fe in sediments might affect the spatial variation of N$_{2}$O fluxes. This study highlighted the large spatial variation of N$_{2}$O fluxes across the coastal marsh (coefficient of variation (CV) = 127.86 %) and the temporal variation of N$_{2}$O fluxes during 2011–2012 (CV = 137.29 %). Presently, the exogenous C and N loadings of the Yellow River estuary are increasing due to human activities; thus, the potential effects of exogenous C and N loadings on N$_{2}$O emissions during early winter should be paid more attention as the N$_{2}$O inventory is assessed precisely.
Starting Page	145
Ending Page	159
Page Count	15
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	40
Issue Number	1
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2016-08-05
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrous oxide emission Spatial and temporal variation Intertidal zone Yellow River estuary Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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