Effects of Salinity on Denitrification and Greenhouse Gas Production from Laboratory-incubated Tidal Forest Soils

Marton, John M.; Herbert, Ellen R.; Craft, Christopher

doi:10.1007/s13157-012-0270-3

Cited by 165 publications

(127 citation statements)

References 29 publications

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“…2a and c). Similarly, other studies have documented short-term increases in potential CO 2 production, CO 2 emissions, and/or the production of dissolved inorganic C following saltwater intrusion (Chambers et al, 2011Weston et al, 2011;Marton et al, 2012;Jun et al, 2013), with the duration of the response being < 3 weeks (Chambers et al, 2011) up to 6 months (Weston et al, 2011). In contrast, short-to moderate-term saltwater intrusion typically results in decreased rates of CH 4 production and emissions, which also occurred in our study ( Fig.…”

Section: Initial Biogeochemical Effects Of Saltwater Intrusionsupporting

confidence: 88%

“…2b and d). This response is supported both by thermodynamic theory (i.e., sulfate reduction is energetically favorable over methanogenesis) (Schlesinger, 1997) and the experimental results of several other saltwater intrusion studies (e.g., Weston et al, 2006;Chambers et al, 2011;Marton et al, 2012;Morse et al, 2012;Neubauer, 2013a). However, Weston et al (2011) reported contrasting results, and documented a large, sustained increase in CH 4 emissions that persisted for 5 months following simulated saltwater intrusion.…”

Section: Initial Biogeochemical Effects Of Saltwater Intrusionmentioning

confidence: 61%

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Saltwater intrusion into tidal freshwater marshes alters the biogeochemical processing of organic carbon

2013

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Abstract. Environmental perturbations in wetlands affect the integrated plant-microbial-soil system, causing biogeochemical responses that can manifest at local to global scales. The objective of this study was to determine how saltwater intrusion affects carbon mineralization and greenhouse gas production in coastal wetlands. Working with tidal freshwater marsh soils that had experienced ∼ 3.5 yr of in situ saltwater additions, we quantified changes in soil properties, measured extracellular enzyme activity associated with organic matter breakdown, and determined potential rates of anaerobic carbon dioxide (CO 2 ) and methane (CH 4 ) production. Soils from the field plots treated with brackish water had lower carbon content and higher C : N ratios than soils from freshwater plots, indicating that saltwater intrusion reduced carbon availability and increased organic matter recalcitrance. This was reflected in reduced activities of enzymes associated with the hydrolysis of cellulose and the oxidation of lignin, leading to reduced rates of soil CO 2 and CH 4 production. The effects of long-term saltwater additions contrasted with the effects of short-term exposure to brackish water during three-day laboratory incubations, which increased rates of CO 2 production but lowered rates of CH 4 production. Collectively, our data suggest that the long-term effect of saltwater intrusion on soil CO 2 production is indirect, mediated through the effects of elevated salinity on the quantity and quality of autochthonous organic matter inputs to the soil. In contrast, salinity, organic matter content, and enzyme activities directly influence CH 4 production. Our analyses demonstrate that saltwater intrusion into tidal freshwater marshes affects the entire process of carbon mineralization, from the availability of organic carbon through its terminal metabolism to CO 2 and/or CH 4 , and illustrate that long-term shifts in biogeochemical functioning are not necessarily consistent with short-term disturbance-type responses.

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Section: Initial Biogeochemical Effects Of Saltwater Intrusionsupporting

confidence: 88%

Section: Initial Biogeochemical Effects Of Saltwater Intrusionmentioning

confidence: 61%

Saltwater intrusion into tidal freshwater marshes alters the biogeochemical processing of organic carbon

2013

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“…They considered that salinity could inhibit the nitrification and denitrification processes and decrease the production of N 2 O. On the contrary, Marton et al (2012) found that N 2 O production elevated responded to increased salinity in the Satilla River tidal forest soils. One possible explanation for positive effect was that the salinity might not completely inhibit the N turnover and the activities of nitrifiers and denitrifiers in soil (Lv et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Seasonal dynamics in nitrous oxide emissions under different types of vegetation in saline-alkaline soils of the Yellow River Delta, China and implications for eco-restoring coastal wetland

Zhang

Song

Zhang

et al. 2013

Ecological Engineering

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a b s t r a c tSalt-affected soils are extensively present and constitute about 7% of total land surface. However, our knowledge about nitrous oxide (N 2 O) production through rapid nitrification and denitrification processes between the atmosphere and the saline soil is very limited. In order to evaluate the potential of N 2 O consumption in saline soils, this study was therefore designed to quantify the variability in N 2 O emissions monthly in the Yellow River Delta in China. Main issues include: different saline-alkaline soils and temporal aspects. Our aim was to quantify N 2 O emissions and identify the major drivers controlling its emissions for providing guidance in eco-restoring coastal wetland on large scale. By using in situ closed chambers the annual average emissions of N 2 O from the mudflat was determined and it was significantly higher than plant communities, especially herbage communities. In general, the emissions of N 2 O of different ecosystems showed a unique-peak annual pattern, with the peak in September. Saline-alkaline mudflat and different vegetations acted as N 2 O source in the Yellow River Delta and the N 2 O emission of different ecosystems followed the order: Saline-alkaline mudflat > T. chinensis >S. salsa > P. australis. Therefore restoration of saline land through revegetation was necessary to reduce the N 2 O emission of saline soils. The effects of air and soil temperature on N 2 O fluxes were significant in salt-affected soils except P. australis. Soil water content and electrical conductivity correlated positively or negatively with N 2 O emissions in mudflat and P. australis community. While relationships between N 2 O production and other soil properties (TC, TN, C:N ratio, NH 4 + -N and NO 3 − -N) were only significant in mudflat and T. chinensis community. Temporal variations of N 2 O emission were related to the interactions of abiotic factors (air and soil temperature, soil water content and electrical conductivity) and the variations of other soil properties, while spatial variations were mainly affected by the vegetation composition at spatial scale.

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“…In contrast, higher salinity conditions during pre-monsoon may have partially inhibited sediment CH 4 production rate. For example, Marton et al (2012) also reported lower CH 4 production rates during high salinity conditions. Other work in tidal mangrove forests have shown that intrusion of high salinity waters results in higher pore-water salinities, along with availibility of terminnal electron acceptors (e.g., NO − 3 , SO 2− 4 )-which constrain CH 4 production (Craft et al, 2009;Larsen et al, 2010).…”

Section: Sediment Geochemistry In the Mangroves Of Lothian Islandmentioning

confidence: 99%

Mangrove Methane Biogeochemistry in the Indian Sundarbans: A Proposed Budget

2017

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Biogeochemical cycling of CH 4 was investigated at Lothian Island, one of the relatively pristine islands of Indian Sundarbans and its adjacent Saptamukhi estuary, during June 2010 to December 2012. Intertidal mangrove sediments were highly anoxic and rich in organic carbon. Mean rates of methanogenesis were 3,547 and 48.88 µmol m −3 wet sediment d −1 , for intertidal (up to 25 cm depth) and sub-tidal sediments (first 5 cm depth), respectively. CH 4 in pore-water was 53.4 times more supersaturated than in adjacent estuarine waters. This resulted in significant CH 4 efflux from sediments to estuarine waters-via advective and diffusive transport. About 8.2% of the total CH 4 produced in intertidal mangrove sediments was transported to the adjacent estuary through advective flux, which was 20 times higher than diffusive CH 4 flux. Mean CH 4 concentrations in estuarine surface and sub-surface waters were 69.9 and 56.1 nM, respectively, with a dissolved CH 4 oxidation rate in estuarine surface waters of 20.5 nmol L −1 d −1 . An estimated 0.09 Gg year −1 of CH 4 is released from estuaries of Sundarbans to the regional atmosphere. The mean CH 4 mixing ratio over the forest atmosphere was 2 ppmv. On annual basis, only 2.75% of total supplied CH 4 to the forest atmosphere was transported to the upper atmosphere via biosphere-atmosphere exchange. Mean CH 4 photo-oxidation rate over the forest atmosphere was 3.25 × 10 −9 mg cm −3 d −1 . Using new and previously published data we present for the first time, a CH 4 budget for Sundarbans mangrove ecosystem which in part, revealed the existence of anaerobic CH 4 oxidation in the mangrove sediment column.

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Effects of Salinity on Denitrification and Greenhouse Gas Production from Laboratory-incubated Tidal Forest Soils

Cited by 165 publications

References 29 publications

Saltwater intrusion into tidal freshwater marshes alters the biogeochemical processing of organic carbon

Saltwater intrusion into tidal freshwater marshes alters the biogeochemical processing of organic carbon

Seasonal dynamics in nitrous oxide emissions under different types of vegetation in saline-alkaline soils of the Yellow River Delta, China and implications for eco-restoring coastal wetland

Mangrove Methane Biogeochemistry in the Indian Sundarbans: A Proposed Budget

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