Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils

Pérez, Cecilia A.; Carmona, Martín R.; Fariña, José Miguel; Armestó, Juan J.

doi:10.4067/s0718-58392010000200008

Cited by 10 publications

(7 citation statements)

References 44 publications

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“…A higher capacity for N removal from the Melaleucas might be expected given the more saturated, organic-rich soils found in these systems, which are favourable for denitrifier activity (Cardenas et al, 2017;Tomasek et al, 2019). The mangrove soils, however, have higher nitrate availability, more labile carbon and lower C:N, which all maintain high rates of denitrification (Klemedtsson et al, 2005;Luo et al, 1999;Pérez et al, 2010). The large variation in soil moisture content between the mangrove and Melaleuca soils used in the incubation experiments likely had a large effect on biogeochemical processing, however, the soil moisture was reflective of the expected higher saturation in Melaleuca soils in natural systems.…”

Section: Controls and Mechanisms Of Carbon And N Cyclingmentioning

confidence: 99%

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Comer‐Warner

Nguyen²,

Nguyen³

et al. 2022

Science of The Total Environment

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Section: Controls and Mechanisms Of Carbon And N Cyclingmentioning

confidence: 99%

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Comer‐Warner

Nguyen²,

Nguyen³

et al. 2022

Science of The Total Environment

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“…higher N 2 O emissions at lower C/N), similar to the observations of Huang et al ( 2004 ) and Chen et al ( 2013 ). The highest emissions were consistently observed from the HC amended soils at all WFPS, with high levels of readily available (mineral) N and labile C to promote denitrification at the highest WFPS (Robertson and Tiedje 1988 ; Regina et al 1998 ; Mohn et al 2000 ; Garcia-Montiel et al 2003 ; Bateman and Baggs 2005 ; Wallenstein et al 2006 ; Pérez et al 2010 ). The significant increase in N 2 O emissions we observed once WFPS exceeded 75% has been demonstrated in many studies (Weier et al 1993 ; Rudaz et al 1999 ; Ruser et al 2006 ).…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, N 2 O emissions can be stimulated by the application of N fertiliser and organic soil amendments (Aulakh et al 1984 ; Eichner 1990 ; Wang et al 2011 , 2012 ). Decomposition of organic materials generates labile C compounds (Chatterjee et al 2008 ) which enhances the denitrification rate in soils (Robertson and Tiedje 1988 ; Wallenstein et al 2006 ; Pérez et al 2010 ).…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gas emissions from sub-tropical agricultural soils after addition of organic by-products

et al. 2014

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As the cost of mineral fertilisers increases globally, organic soil amendments (OAs) from agricultural sources are increasingly being used as substitutes for nitrogen. However, the impact of OAs on the production of greenhouse gases (CO2 and N2O) is not well understood. A 60-day laboratory incubation experiment was conducted to investigate the impacts of applying OAs (equivalent to 296 kg N ha-1 on average) on N2O and CO2 emissions and soil properties of clay and sandy loam soils from sugar cane production. The experiment included 6 treatments, one being an un-amended (UN) control with addition of five OAs being raw mill mud (MM), composted mill mud (CM), high N compost (HC), rice husk biochar (RB), and raw mill mud plus rice husk biochar (MB). These OAs were incubated at 60, 75 and 90% water-filled pore space (WFPS) at 25°C with urea (equivalent to 200 kg N ha-1) added to the soils thirty days after the incubation commenced. Results showed WFPS did not influence CO2 emissions over the 60 days but the magnitude of emissions as a proportion of C applied was RB < CM < MB < HC < MM. Nitrous oxide emissions were significantly less in the clay soil compared to the sandy loam at all WFPS, and could be ranked RB < MB < MM < CM < UN < HC. These results led to linear models being developed to predict CO2 and N2O emissions as a function of the dry matter and C/N ratio of the OAs, WFPS, and the soil CEC. Application of RB reduced N2O emissions by as much as 42-64% depending on WFPS. The reductions in both CO2 and N2O emissions after application of RB were due to a reduced bioavailability of C and not immobilisation of N. These findings show that the effect of OAs on soil GHG emissions can vary substantially depending on their chemical properties. OAs with a high availability of labile C and N can lead to elevated emissions of CO2 and N2O, while rice husk biochar showed potential in reducing overall soil GHG emissions.

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“…Nitrogen addition can increase (Brenner et al, 2005;Lu et al, 2011;Corre et al, 2014), decrease (Lovett et al, 2013;Cai et al, 2014), or have no effect (Brenner et al, 2005;Wang et al, 2014) on net nitrification. Similarly, denitrification was found to increase (Perez et al, 2010), decrease (Bengtsson and Bergwall, 2000;Berntson and Aber, 2000), or remain unchanged (Wallenstein et al, 2006) under N addition. A meta-analysis indicated that N addition significantly increased net N mineralization, nitrification, and denitrification by 25, 154, and 84%, respectively, but did not change N immobilization (Lu et al, 2011).…”

mentioning

confidence: 91%

Effects of Nitrogen Addition on Potential Soil Nitrogen-Cycling Processes in a Temperate Forest Ecosystem

Sun

Peng

et al. 2016

Soil Science

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Anthropogenic nitrogen (N) deposition substantially alters N cycling in terrestrial ecosystems because of its effects on soil physicochemical properties and soil microbes. Responses of N transformation processes to consecutive N additions are unclear, pointing to a lack of systematic understanding of N cycling under long-term N addition. This work combines 15 N tracing laboratory incubation with the FLUAZ model to study potential gross N-cycling processes in a temperate forest ecosystem in eastern Asia after 6 years of consecutive N additions at a rate of 50 kg N ha −1 year −1 . Soils from plots that received N additions had greater gross N mineralization probably because of higher soil carbon (C) and N than soils from control plots. Gross nitrification in soil from plots receiving N additions was inhibited likely because of lower pH in these plots. Higher NH 4 + concentrations under N addition increased N immobilization by microbes, but NO 3 − immobilization was much lower than NH 4 + immobilization. Our results also show that N remineralization was stimulated by N addition and that microbes in N addition plots had greater N uptake probably because they adapted to high N concentration that led to accelerated microbial N turnover rate. This research highlights the importance of considering the effects of increasing N deposition on N processes mediated by microbes.

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Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils

Cited by 10 publications

References 44 publications

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Greenhouse gas emissions from sub-tropical agricultural soils after addition of organic by-products

Effects of Nitrogen Addition on Potential Soil Nitrogen-Cycling Processes in a Temperate Forest Ecosystem

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