Management Practices of Miscanthus × giganteus Strongly Influence Soil Properties and N2O Emissions Over the Long Term

Peyrard, Céline; Ferchaud, Fabien; Mary, Bruno; Gréhan, Eric; Léonard, Julien

doi:10.1007/s12155-016-9796-1

Cited by 18 publications

(17 citation statements)

References 68 publications

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“…The leaf litter in late harvest treatment represents a significant carbon input (Amougou, Bertrand, Cadoux, & Recous, ; Amougou, Bertrand, Machet, & Recous, ) and creates a mulch layer, which increases soil moisture by reducing soil evaporation. Such conditions are known to be favorable to N 2 O emissions by denitrification as recently reported with Miscanthus (Peyrard, Ferchaud, Mary, Gréhan, & Léonard, ). However, we did not find significant differences in PDA between harvesting dates.…”

Section: Discussionsupporting

confidence: 55%

Peaks of in situ N₂O emissions are influenced by N₂O‐producing and reducing microbial communities across arable soils

Domeignoz‐Horta

Philippot

Peyrard

et al. 2017

Global Change Biology

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118

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Agriculture is the main source of terrestrial N 2 O emissions, a potent greenhouse gas and the main cause of ozone depletion. The reduction of N 2 O into N 2 by microorganisms carrying the nitrous oxide reductase gene (nosZ) is the only known biological process eliminating this greenhouse gas. Recent studies showed that a previously unknown clade of N 2 O-reducers (nosZII) was related to the potential capacity of the soil to act as a N 2 O sink. However, little is known about how this group responds to different agricultural practices. Here, we investigated how N 2 Oproducers and N 2 O-reducers were affected by agricultural practices across a range of cropping systems in order to evaluate the consequences for N 2 O emissions. The abundance of both ammonia-oxidizers and denitrifiers was quantified by real-time qPCR, and the diversity of nosZ clades was determined by 454 pyrosequencing.Denitrification and nitrification potential activities as well as in situ N 2 O emissions were also assessed. Overall, greatest differences in microbial activity, diversity, and abundance were observed between sites rather than between agricultural practices at each site. To better understand the contribution of abiotic and biotic factors to the in situ N 2 O emissions, we subdivided more than 59,000 field measurements into fractions from low to high rates. We found that the low N 2 O emission rates were mainly explained by variation in soil properties (up to 59%), while the high rates were explained by variation in abundance and diversity of microbial communities (up to 68%). Notably, the diversity of the nosZII clade but not of the nosZI clade was important to explain the variation of in situ N 2 O emissions. Altogether, these results lay the foundation for a better understanding of the response of N 2 O-reducing bacteria to agricultural practices and how it may ultimately affect N 2 O emissions.

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Section: Discussionsupporting

confidence: 55%

Peaks of in situ N₂O emissions are influenced by N₂O‐producing and reducing microbial communities across arable soils

Domeignoz‐Horta

Philippot

Peyrard

et al. 2017

Global Change Biology

Self Cite

118

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“…However, as discussed previously, the favorable conditions of moisture and temperature associated with the fast decomposition that was observed in our study could explain the response observed. Overall, our study showed that 70% of the N O emitted over 1 year with fertilized sugarcane could be attributed to the presence of crop residues, which confirms recent studies that emphasize the importance of postharvest periods for high N 2 O emissions and the role of crop residue management (e.g., Peyrard et al 2017;Rezaei Rashti et al 2017;Tongwane et al 2016). This findingisparticularlyrelevantinsituationswithperennialor semi-perennial crops and no-tilled arable systems in which crop residues are left at the soil surface, thereby promoting favorable conditions for emissions at the soil-straw interface (Peyrard et al 2017;Shan and Yan 2013;Vasconcelos et al 2018).…”

Section: Effects Of Straw On N 2 O Emissionssupporting

confidence: 90%

“…However, the C available from the straw also contributes to ad e c r e a s ei ns o i lO 2 availability resulting from increases in microbial activity, which can be linked to the correlation observed between N 2 O and CO 2 emissions in PCA analyses. Oxygen depletion and CO 2 emissions due to microbial activity during straw decomposition (Badagliacca et al 2017;Peyrard et al 2017) combined with a WFPS of approximately 60% after rain events might have favored N 2 Oproductionby denitrification with the appearance of anoxic spots, mainly at the soil-straw interface. In summary, our findings indicated that mulching provided favorable soil conditions for both nitrification and denitrification processes, which could occur simultaneously.…”

Section: N 2 O Emissions From Fertilizer and Interaction With Strawmentioning

confidence: 99%

N2O emission increases with mulch mass in a fertilized sugarcane cropping system

et al. 2019

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The nitrous oxide (N 2 O) emitted from soil was monitored to investigate the effect of sugarcane straw removal on the mechanisms that make mulch a Bhot spot^of N 2 O emissions under subtropical conditions. We conducted a field experiment with the firstratoon sugarcane with four amounts of straw (0, 4, 8, and 12 Mg ha −1) at the soil surface combined with 0 or 100 kg urea-N ha −1. The urea-N was applied 52 days after straw application. Over the course of 1 year, we measured the N 2 O and carbon dioxide (CO 2) emissions, mineral nitrogen (N), soil moisture and temperature, and remaining straw carbon (C) and N in the mulch. We observed two Bhot moments^for N 2 O emissions: the first one immediately after sugarcane straw application to soil and the second one after fertilizer-N application. High amounts of straw left on the soil led to an increase in the water-filled pore space (WFPS), and both WFPS and straw-C were strongly correlated with N 2 Ofluxes.CumulativeN 2 O increased from 510 (0 Mg + N) to 1055 (12 Mg + N) g N 2 ON ha −1 for the fertilized straw treatments. The N 2 O emission factors (EFs) of the sugarcane straw N and the fertilizer-N increased linearly with straw quantity, i.e., were not constant but were lower than the IPCC default values. Over 70% of the cumulative N 2 O emissions measured in straw + fertilizer-N treatments for 1 year were attributed to the presence of straw mulch, which emphasized the importance of the straw layer at the soil surface as a hot spot for N 2 O emissions.

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“…The leaf litter in late harvest treatment represents a significant carbon input (Amougou et al, 2012(Amougou et al, , 2011 and creates a mulch layer, which increases soil moisture by reducing soil evaporation. Such conditions are known to be favorable to N 2 O emissions by denitrification as recently reported with Miscanthus (Peyrard et al, 2016b). However, we did not find significant differences in PDA between harvesting dates.…”

Section: Responses Of N 2 O-producing N 2 O-reducing Microbial Commusupporting

confidence: 64%

1557 - Peaks of in situ N₂O emissions are influenced by N₂O producing and reducing microbial communities across arable soils

Philippot¹

2018

Preprint

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Agriculture is the main source of terrestrial N 2 O emissions, a potent greenhouse gas and the main cause of ozone depletion. The reduction of N 2 O into N 2 by microorganisms carrying the nitrous oxide reductase gene (nosZ) is the only known biological process eliminating this greenhouse gas. Recent studies showed that a previously unknown clade of N 2 O-reducers (nosZII) was related to the potential capacity of the soil to act as a N 2 O sink. However little is known about how this group responds to different agricultural practices. Here, we investigated how N 2 O-producers and N 2 O-reducers were affected by agricultural practices across a range of cropping systems in order to evaluate the consequences for N 2 O emissions. The abundance of both ammonia oxidizers and denitrifiers was quantified by real-time qPCR, and the diversity of nosZ clades was determined by 454 pyrosequencing. Denitrification and nitrification potential activities as well as in situ N 2 O emissions were also assessed. Overall, greatest differences in microbial activity, diversity and abundance were observed between sites rather than between agricultural practices at each site. To better understand the contribution of abiotic and biotic factors to the in situ N 2 O emissions, we subdivided more than 59.000 field measurements into fractions from low to high rates. We found that the low N 2 O emission rates were mainly explained by variation in soil properties (up to 59%), while the high rates were explained by variation in abundance and diversity of microbial communities (up to 68%). Notably, the diversity of the nosZII clade but not of the nosZI clade was important to explain the variation of in situ N 2 O emissions. Altogether, these Version postprint

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Management Practices of Miscanthus × giganteus Strongly Influence Soil Properties and N2O Emissions Over the Long Term

Cited by 18 publications

References 68 publications

Peaks of in situ N₂O emissions are influenced by N₂O‐producing and reducing microbial communities across arable soils

Peaks of in situ N₂O emissions are influenced by N₂O‐producing and reducing microbial communities across arable soils

N2O emission increases with mulch mass in a fertilized sugarcane cropping system

1557 - Peaks of in situ N₂O emissions are influenced by N₂O producing and reducing microbial communities across arable soils

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Management Practices of Miscanthus × giganteus Strongly Influence Soil Properties and N2O Emissions Over the Long Term

Cited by 18 publications

References 68 publications

Peaks of in situ N2O emissions are influenced by N2O‐producing and reducing microbial communities across arable soils

Peaks of in situ N2O emissions are influenced by N2O‐producing and reducing microbial communities across arable soils

N2O emission increases with mulch mass in a fertilized sugarcane cropping system

1557 - Peaks of in situ N₂O emissions are influenced by N₂O producing and reducing microbial communities across arable soils

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Peaks of in situ N₂O emissions are influenced by N₂O‐producing and reducing microbial communities across arable soils

Peaks of in situ N₂O emissions are influenced by N₂O‐producing and reducing microbial communities across arable soils