Spatial and Temporal Variation in Soil Nitrous Oxide Emissions from a Rehabilitated and Undisturbed Riparian Forest

Carlo, N.D. De; Oelbermann, Maren; Gordon, Andrew

doi:10.2134/jeq2018.10.0357

Cited by 11 publications

(3 citation statements)

References 47 publications

(74 reference statements)

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“…Despite the large N 2 O emissions in the no-buffer control, they were not significantly different to the vegetated riparian buffers and the upslope maize. The findings were similar to Baskerville et al (2021) andDe Carlo et al (2019), who observed no significant differences in N 2 O emissions amongst the riparian zones. Baskerville et al, (2021) also reported that there were no significant differences when comparing these zones to the agricultural land.…”

Section: Gas Emissions In Upslope Maize and Downslope Riparian Buffer...supporting

confidence: 91%

Soil N2O and CH4 emissions from fodder maize production with and without riparian buffer strips of differing vegetation

et al. 2022

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Purpose Nitrous oxide (N2O) and methane (CH4) are some of the most important greenhouse gases in the atmosphere of the 21st century. Vegetated riparian buffers are primarily implemented for their water quality functions in agroecosystems. Their location in agricultural landscapes allows them to intercept and process pollutants from adjacent agricultural land. They recycle organic matter, which increases soil carbon (C), intercept nitrogen (N)-rich runoff from adjacent croplands, and are seasonally anoxic. Thus processes producing environmentally harmful gases including N2O and CH4 are promoted. Against this context, the study quantified atmospheric losses between a cropland and vegetated riparian buffers that serve it. Methods Environmental variables and simultaneous N2O and CH4 emissions were measured for a 6-month period in a replicated plot-scale facility comprising maize (Zea mays L.). A static chamber was used to measure gas emissions. The cropping was served by three vegetated riparian buffers, namely: (i) grass riparian buffer; (ii) willow riparian buffer and; (iii) woodland riparian buffer, which were compared with a no-buffer control. Results The no-buffer control generated the largest cumulative N2O emissions of 18.9 kg ha− 1 (95% confidence interval: 0.5–63.6) whilst the maize crop upslope generated the largest cumulative CH4 emissions (5.1 ± 0.88 kg ha− 1). Soil N2O and CH4-based global warming potential (GWP) were lower in the willow (1223.5 ± 362.0 and 134.7 ± 74.0 kg CO2-eq. ha− 1 year− 1, respectively) and woodland (1771.3 ± 800.5 and 3.4 ± 35.9 kg CO2-eq. ha− 1 year− 1, respectively) riparian buffers. Conclusions Our results suggest that in maize production and where no riparian buffer vegetation is introduced for water quality purposes (no buffer control), atmospheric CH4 and N2O concerns may result.

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Section: Gas Emissions In Upslope Maize and Downslope Riparian Buffer...supporting

confidence: 91%

Soil N2O and CH4 emissions from fodder maize production with and without riparian buffer strips of differing vegetation

et al. 2022

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“…Beneficial impacts of the RBS on both local terrestrial and aquatic environments were observed since rehabilitation was initiated, e.g., reduced soil respiration, enhanced wildlife habitat and maintenance of stream water temperature (Oelbermann et al, 2008). Concerning greenhouse gases, De Carlo et al (2019) found no significant differences in N 2 O emissions between the rehabilitated and an upstream natural riparian forests, which was confirmed later by Baskerville et al (2021), who also found lower N 2 O emissions in the RBS compared to an agricultural field adjacent to the rehabilitated RBS. Moreover, Mafa-Attoye et al (2020) detected significant differences in N-cycling bacterial communities between RBS and agricultural soils.…”

Section: Introductionmentioning

confidence: 63%

Dynamics of methane cycling microbiome during methane flux hot moments from riparian buffer systems

Obregón

Mafa-Attoye

Baskerville

et al. 2022

Preprint

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Riparian buffer systems (RBS) are a common agroforestry practice that consists of keeping a forested boundary adjacent to water bodies in agricultural landscapes, thus helping to protect aquatic ecosystems from adverse impacts. Nevertheless, despite the multiple benefits they provide, RBSs can be hotspots of methane emissions since abundant organic carbon and high-water tables are often found in these soils. In southern Ontario, Canada, the rehabilitation of Washington Creek streambank occurred in 1985. In a recent study, methane (CH4) fluxes were measured biweekly for two years (2017-2018) in four different vegetative riparian areas alongside Washington creek: a rehabilitated tree buffer (RH), a grassed buffer (GRB), an undisturbed deciduous forest (UNF), an undisturbed coniferous forest (CF), and an adjacent agricultural field (AGR) for comparison. Based on methane fluxes in 2018 and hot moments identified, we selected two dates from summer (July 04 and August 15) and use soil sampling from those days to assess the CH4 cycling microbial communities in these RBS. We used qPCR and high-throughput sequencing from both DNA and cDNA to measure the diversity and activity of the methanogen and methanotroph communities. Methanogens were abundant in all riparian soils, including the archaeal genera Methanosaeta, Methanosarcina, Methanomassiliicoccus Methanoreggula, but they were mostly active in UNF soils. Among methanotrophs, Methylocystis was the most abundant taxon in all the riparian sites, except for AGR soils where the methanotrophs community mostly comprised members of rice paddy clusters (RPCs and RPC-1) and upland soil clusters (TUSC and USCα). In summary, these results indicate that differences in CH4 fluxes between RBS at Washington creek are influenced by differences in the presence and activity of methanogens, which were higher in the deciduous forest (UNF) soils during hot moments CH4 flux, likely due to high water content in that soils

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“…Remarkably high net average N 2 O uxes from soil have been measured in riparian forests 22 , and most of the studies were conducted in riparian alder stands [23][24][25][26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Canopy airspace of riparian forest mitigates soil N2O emission during hot moments

Mander

Krasnova

Escuer-Gatius

et al. 2020

Preprint

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Riparian forests are known as hot spots of N cycling in landscapes and climate warming speeds up the cycle. Here we present results from the first multi-annual high temporal-frequency study of soil, stem and ecosystem (eddy covariance) fluxes of N2O from a typical riparian forest in Europe.Hot moments (extreme events of N2O emission) last a quarter of the study period but contribute more than a half of soil fluxes. For the first time we demonstrate that high soil emissions of N2O do not reach the ecosystem level. During the drought onset, soil N2O emission peaks at intermediate soil water content. Rapid water content change is the main determinant of the emissions. The freeze–thaw period is another hot moment. However, according to the eddy covariance measurements the riparian forest is a modest source of N2O. We propose photochemical reactions and dissolution in canopy-space water as consumption mechanisms.

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Spatial and Temporal Variation in Soil Nitrous Oxide Emissions from a Rehabilitated and Undisturbed Riparian Forest

Cited by 11 publications

References 47 publications

Soil N2O and CH4 emissions from fodder maize production with and without riparian buffer strips of differing vegetation

Soil N2O and CH4 emissions from fodder maize production with and without riparian buffer strips of differing vegetation

Dynamics of methane cycling microbiome during methane flux hot moments from riparian buffer systems

Canopy airspace of riparian forest mitigates soil N2O emission during hot moments

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