Potential denitrification in wetland sediments with different plant species detritus

Bastviken, Sofia Kallner; Eriksson, Peder; Premrov, Alina; Tonderski, Karin

doi:10.1016/j.ecoleng.2005.04.013

Cited by 116 publications

(48 citation statements)

References 23 publications

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“…These processes were most likely accelerated by plants, which contributed higher quantity and better quality biomass in P enriched plots. The enhancement of heterotrophic microbial activity by P additions or in high P soils has been well documented (Bridgham and Richardson 1992;DeBusk and Reddy 1998;Bastviken et al 2005). The increased input of easily decomposable plant material and rhizodeposition (Kozub and Liehr 1999) and resulting lower oxygen concentrations (Nielsen 1990) may have been the main drivers for the recorded changes in N cycle processes.…”

Section: P Addition Effectmentioning

confidence: 99%

Heterotrophic microbial activities and nutritional status of microbial communities in tropical marsh sediments of different salinities: the effects of phosphorus addition and plant species

et al. 2010

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Oligotrophic, phosphorus (P) limited herbaceous wetlands of northern Belize are being impacted by P loading from fertilizer runoff. P enrichment causes a shift in autotroph communities from a microphyte (cyanobacterial mats, CBM) to macrophyte (Eleocharis spp., Typha domingensis) dominated system. To document potential effects of P, salinity, and macrophyte species on the heterotrophic microbial community nutritional status (represented especially by specific phospholipids fatty acids and specific respiration rate), biomass and activities, we took soil samples from established P enrichment plots in replicated marshes of two salinity levels. P addition increased microbial biomass carbon (C), nitrogen (N) and P, as well as soil nutrient transformation rates (nitrogenase activity, N mineralization and immobilization, methanogenesis). The effect of plant species (Eleocharis vs Typha sites) was generally lower than the effect of P addition (CBM vs Eleocharis sites) and was most evident at the low salinity sites, where Eleocharis dominated plots had enhanced nitrogenase activity and P microbial immobilization. Salinity reduced the overall rates of microbial processes; it also weakened the positive effect of both P addition and plant species on microbial activities. Lastly, the amount of N stored in microbial cells, likely in form of osmoprotective compounds, was enhanced by salinity.

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Section: P Addition Effectmentioning

confidence: 99%

Heterotrophic microbial activities and nutritional status of microbial communities in tropical marsh sediments of different salinities: the effects of phosphorus addition and plant species

et al. 2010

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“…First of all, RCG can stimulate the processes of GHG production by increasing the labile soil organic carbon pool, e.g. via root exudates (Ström et al, 2003;Bastviken et al, 2005). Next, the transport of oxygen to anaerobic zones stimulates heterotrophic degradation of organic matter, but at the same time stimulates oxidation of CH 4 (Kao-Kniffin et al, 2010) and suppress CH 4 production due to increase in redox potential (Laanbroek, 2010;SuttonGrier and Megonigal, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

2015

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Abstract. Cultivation of bioenergy crops in rewetted peatland (paludiculture) is considered as a possible land use option to mitigate greenhouse gas (GHG) emissions. However, bioenergy crops like reed canary grass (RCG) can have a complex influence on GHG fluxes. Here we determined the effect of RCG cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWLs), i.e. 0, −10 and −20 cm below the soil surface in a controlled semi-field facility. Emissions of CO 2 (ecosystem respiration, ER), CH 4 and N 2 O from mesocosms with RCG and bare soil were measured at weekly to fortnightly intervals with static chamber techniques for a period of 1 year. Cultivation of RCG increased both ER and CH 4 emissions, but decreased the N 2 O emissions. The presence of RCG gave rise to 69, 75 and 85 % of total ER at −20, −10 and 0 cm GWL, respectively. However, this difference was due to decreased soil respiration at the rising GWL as the plant-derived CO 2 flux was similar at all three GWLs. For methane, 70-95 % of the total emission was due to presence of RCG, with the highest contribution at −20 cm GWL. In contrast, cultivation of RCG decreased N 2 O emission by 33-86 % with the major reductions at −10 and −20 cm GWL. In terms of global warming potential, the increase in CH 4 emissions due to RCG cultivation was more than offset by the decrease in N 2 O emissions at −10 and −20 cm GWL; at 0 cm GWL the CH 4 emissions was offset only by 23 %. CO 2 emissions from ER were obviously the dominant RCG-derived GHG flux, but aboveground biomass yields, and preliminary measurements of gross photosynthetic production, showed that ER could be more than balanced due to the photosynthetic uptake of CO 2 by RCG. Our results support that RCG cultivation could be a good land use option in terms of mitigating GHG emission from rewetted peatlands, potentially turning these ecosystems into a sink of atmospheric CO 2 .

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“…This difference suggests that the T2 site might receive lower-quality of carbon materials than the T1 site. Previous research also demonstrated that denitrification rates were lower in riparian sediments treated with a high C/N ratio organic materials than in riparian sediments treated with a low C:N ratio organic materials, emphasizing the importance of carbon quality (Schipper et al 1994;Bastviken et al 2005;Hernadez and Mitsch 2007).…”

Section: Discussionmentioning

confidence: 99%

Factors Controlling Sediment Denitrification Rates in Grassland and Forest Streams

Kim¹

2014

Terr. Atmos. Ocean. Sci.

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Sediment denitrification is an important nitrate (NO 3 -) removal process from agricultural streams. The direct and indirect factors that control denitrification rates in tributary sediments can vary depending on the types of agricultural activities and vegetation. Our research investigated (1) tributary sediment denitrification rates in a grassland stream affected by pasture ecosystems and a forest stream affected by N fertilization; and (2) the environmental factors that determine denitrification rates in tributary sediments. The denitrification enzyme activity (DEA) in grassland stream sediments is positively correlated with precipitation likely due to the increased nutrient exchange rates between stream water and sediments, and was higher than in forest stream sediments, leading to a decrease in NO 3 -concentration ([NO 3 -]) in stream sediments. The DEA in riparian sediments was regulated by carbon concentrations and did not contribute to NO 3 -removal from the riparian sediment in grassland and forest streams. Thus, environmental factors affected by different types of agricultural activities and vegetation might regulate denitrification rates and in agricultural stream ecosystems.

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Potential denitrification in wetland sediments with different plant species detritus

Cited by 116 publications

References 23 publications

Heterotrophic microbial activities and nutritional status of microbial communities in tropical marsh sediments of different salinities: the effects of phosphorus addition and plant species

Heterotrophic microbial activities and nutritional status of microbial communities in tropical marsh sediments of different salinities: the effects of phosphorus addition and plant species

Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

Factors Controlling Sediment Denitrification Rates in Grassland and Forest Streams

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