Fluxes of CO2, CH4, and N2O in tundra-covered and Nothofagus forest soils in the Argentinian Patagonia

Sá, Mariana Médice Firme; Schaefer, Carlos Ernesto Gonçalves Reynaud; Loureiro, Diego Campana; Simas, Felipe Nogueira Bello; Alves, B. J. R.; Mendonça, Eduardo de Sá; Figueiredo, Eduardo Barretto de; Scala, Newton La; Panosso, Alan Rodrigo

doi:10.1016/j.scitotenv.2018.12.328

Cited by 19 publications

(10 citation statements)

References 41 publications

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“…2 Effects of bryophyte removal on ammonification (a), nitrification (b), and total mineralization rates (c) of soils in a subalpine coniferous forest on the east edge of the Tibetan Plateau (mean ± SE). Asterisks represent significant differences (P < 0.05) between treatments supported by the higher soil NH 4 + and relatively lower NO 3 − concentration in the control relative to the bryophyte-removed plots measured here (Table 1) as observed by Firme Sá et al (2019). Our results also showed that the control relative to the bryophyte-removed plots had higher C and N substrate (SOC, DOC, and inorganic N) concentrations (Table 1).…”

Section: Influence Of Bryophyte Removal On Soil Ghg Fluxessupporting

confidence: 72%

“…According to the higher values of soil exchangeable NH 4 + relative to NO 3 − for both treatments, net ammonification was found to be a dominant soil N transformation process at this forest site, which may be related to the well-drained soil conditions (Burton et al 2007;Firme Sá et al 2019). The higher ammonification and net N mineralization observed in the control plots reflect higher amount and quality of organic C and total N content, and the higher microbial abundance of soil in these plots relative to the ones in which the bryophytes were removed (Table 1) (Li et al 2014;Singh et al 2009).…”

Section: Influence Of Bryophyte Removal On Soil Propertiesmentioning

confidence: 82%

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Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest

DeLuca

Sun

et al. 2020

Biol Fertil Soils

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Terrestrial bryophytes substantially regulate ecosystem processes in high latitude and high elevation ecosystems; however, the role of these plants in mediating soil emissions of non-CO 2 greenhouse gases (GHGs) (N 2 O and CH 4 ) in these ecosystems remains poorly understood. A removal experiment was conducted to investigate the influence of bryophytes on soil non-CO 2 GHGs emission in a subalpine coniferous forest on the eastern edge of the Tibetan Plateau. Bryophyte removal decreased the average N 2 O emission rate, but did not significantly alter the CH 4 flux rate. The cumulative amount of N 2 O emission and CH 4 uptake was decreased by bryophyte removal. Compared to bryophyte-removal plots, soil in the control plots had higher concentrations of soil organic C (SOC), total N (TN), dissolved organic C (DOC), dissolved N (DN), and exchangeable NH 4 + . The control plots also had higher cumulative N 2 O emission and CH 4 uptake compared to plots with bryophytes removed. Bryophyteremoval significantly changed the relationship between soil non-CO 2 GHGs flux rates and soil water content, induced a linear decreasing relationship between the N 2 O emission rate and soil water content and a quadratic relationship between CH 4 flux rate and soil water content in the bryophyte-removal plots. Results from this study indicate that bryophytes may regulate non-GHG emissions from subalpine coniferous soils and demonstrate that in the presence of bryophytes, these soils may act as a greater N 2 O source and CH 4 sink in southwestern China.

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Section: Influence Of Bryophyte Removal On Soil Ghg Fluxessupporting

confidence: 72%

Section: Influence Of Bryophyte Removal On Soil Propertiesmentioning

confidence: 82%

Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest

DeLuca

Sun

et al. 2020

Biol Fertil Soils

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“…The sampling method with pre-evacuated vials (with an automatic pump) and the vacuum with manual vacuum pumps method are among the most used to take gas samples from inside of the chamber and to transfer them to the vials (Alves et al, 2012;Cosentino et al, 2013;Coverdale et al, 2016;Della Chiesa et al, 2018;Sá et al, 2019). However, the pre-evacuated vials are costly and not accessible in many cases; therefore, it is necessary to assess whether alternative methods are equally appropriate.…”

Section: Introductionmentioning

confidence: 99%

Comparison of field measurement methods of nitrous oxide soil emissions: from the chamber to the vial

Cosentino

Romaniuk

Lupi

et al. 2020

Revista Brasileira De Ciência Do Solo

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Nitrous oxide (N 2 O) is a greenhouse gas that contributes substantially to global climate change. The N 2 O soil emissions have a large uncertainty because of its low atmospheric concentration levels and enormous spatial and temporal variability, which hinders its correct field measurement. For this reason, there are many papers focused on improving the N 2 O measurements in the field, which focus on different parts of the measurement process. However, no studies have focused on determining the appropriate method, in terms of simplicity and precision, for the sample extraction from inside of the chambers and its transfer to the storage vials, although this step is key in the sampling process. This study aimed to assess and compare the accuracies of three simple and economical methods in transfer soil emitted N 2 O from inside of the chambers to the vials. For this, a highly accepted method (vacuum by manual pump) and two simpler alternative methods (gas exchange by displacement and vacuum by syringe) were compared. Thirty static chambers were assessed with the quantified N 2 O emission values varied from 0 to 450 µg m-2 h-1 of N-N 2 O. Out of the three assessed methods, the vacuum method through the use of a manual vacuum pump was the best to quantifying N 2 O soil emissions (capturing 57 % of the highest emission values), followed by the gas exchange method by displacement (30 %), and finally by the vacuum method by syringe extraction (13%).

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“…Soil-atmosphere GHG exchanges have a considerable impact on global climate change by largely affecting atmospheric GHG concentrations [2,6]. This is because the carbon (C) and nitrogen (N) stocks of soils are vital parts of C and N pools in terrestrial ecosystems [7,8]. In forest ecosystems, soil C stocks are approximately two-thirds of the total C content [9,10], whereas soil N stocks account for >85% of the total N content [11].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, soil GHG dynamics are mainly affected by environmental factors (e.g., temperature, precipitation, and soil moisture), C and N concentrations, and soil microorganisms [51][52][53][54]. However, previous studies were mainly focussed on CO 2 flux; few studies have assessed other GHGs (e.g., CH 4 and N 2 O) [8,55], especially during the SFT period [32,56]. Moreover, the relationships between soil GHG fluxes and their main environmental factors in the CBF during the SFT and GS periods remain poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Soil Greenhouse Gas Fluxes during the Spring Freeze–Thaw Period and the Growing Season in a Temperate Broadleaved Korean Pine Forest, Changbai Mountains, China

Guo

Zhang

et al. 2020

Forests

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Soils in mid-high latitudes are under the great impact of freeze–thaw cycling. However, insufficient research on soil CO2, CH4, and N2O fluxes during the spring freeze–thaw (SFT) period has led to great uncertainties in estimating soil greenhouse gas (GHG) fluxes. The present study was conducted in a temperate broad-leaved Korean pine mixed forest in Northeastern China, where soils experience an apparent freeze–thaw effect in spring. The temporal variations and impact factors of soil GHG fluxes were measured during the SFT period and growing season (GS) using the static-chamber method. The results show that the soil acted as a source of atmospheric CO2 and N2O and a sink of atmospheric CH4 during the whole observation period. Soil CO2 emission and CH4 uptake were lower during the SFT period than those during the GS, whereas N2O emissions were more than six times higher during the SFT period than that during the GS. The responses of soil GHG fluxes to soil temperature (Ts) and soil moisture during the SFT and GS periods differed. During the SFT period, soil CO2 and CH4 fluxes were mainly affected by the volumetric water content (VWC) and Ts, respectively, whereas soil N2O flux was influenced jointly by Ts and VWC. The dominant controlling factor for CO2 was Ts during the GS, whereas CH4 and N2O were mainly regulated by VWC. Soil CO2 and N2O fluxes accounted for 98.0% and 3.1% of the total 100-year global warming potential (GWP100) respectively, with CH4 flux offsetting 1.0% of the total GWP100. The results highlight the importance of environmental variations to soil N2O pulse during the SFT period and the difference of soil GHG fluxes between the SFT and GS periods, which contribute to predicting the forest soil GHG fluxes and their global warming potential under global climate change.

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Fluxes of CO2, CH4, and N2O in tundra-covered and Nothofagus forest soils in the Argentinian Patagonia

Cited by 19 publications

References 41 publications

Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest

Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest

Comparison of field measurement methods of nitrous oxide soil emissions: from the chamber to the vial

Comparison of Soil Greenhouse Gas Fluxes during the Spring Freeze–Thaw Period and the Growing Season in a Temperate Broadleaved Korean Pine Forest, Changbai Mountains, China

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