Potential Pathway of Nitrous Oxide Formation in Plants

Timilsina, Arbindra; Zhang, Chuang; Pandey, Bipin; Bizimana, Fiston; Dong, Wenxu; Hu, Chunsheng

doi:10.3389/fpls.2020.01177

Cited by 26 publications

(21 citation statements)

References 117 publications

(239 reference statements)

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“…There is increasing evidence that many plants may be able to directly facilitate GHG emissions, particularly under waterlogged or flooded conditions [19], although the mechanisms of such processes are unknown [32]. It is also unclear as to what extent plant invasions result in an alteration in ecosystem GHG budgets [8], and the extent to which plants in general, whether they are native or introduced, have some capacity to facilitate GHG emissions.…”

Section: Discussionmentioning

confidence: 99%

“…Intact plants of G. tinctoria were a source of N 2 O emissions and this increased with leaf removal and waterlogging. Although there are now several examples of direct plantassociated N 2 O emissions, the mechanism(s) is still unknown [32]. Earlier studies emphasized the role of plants as passive conduits for the movement of gases including N 2 O and CH 4 from the soil to the atmosphere [11][12][13][14][15], although this may have been confounded by direct emissions from plant tissues [19].…”

Section: N 2 O Fluxesmentioning

confidence: 99%

“…Conversely, there is increasing evidence that different plant parts [19] can produce N 2 O directly through processes that may be linked to mitochondrial activity ( [32], and references therein). Interestingly, the Nostoc species may be associated with increased N 2 O production [41] so that symbiotic N. punctiforme, present in the rhizome tissue of G. tinctoria, may be a source of this gas [33,34].…”

Section: N 2 O Fluxesmentioning

confidence: 99%

“…The removal of leaves would significantly reduce photosynthesis, whilst direct N 2 O emissions from plants and soils would increase. Although the mechanism(s) associated with the production of N 2 O by plant tissues is not known [32], the ability of G. tinctoria to fix atmospheric N [33][34][35], could also contribute to increased emissions [36]. Finally, we also hypothesized that waterlogging would reduce photosynthesis in intact plants, primarily through stomatal closure as well as resulting in plant-enhanced [32] and/or increased soil N 2 O emissions [19].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Cutting and Waterlogging on Plant-Related CO2 and N2O Fluxes Associated with the Invasive N-Fixing Species Gunnera tinctoria

Mantoani¹

2021

Diversity

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The overall impact that plant invasions have on greenhouse gas emissions (GHG) by plant-mediated effects and how these interact with environmental and management factors is largely unknown. To address this, we report on the effects of leaf removal and waterlogging, either singularly or in combination, on the fluxes of CO2 and N2O associated with the invasive species Gunnera tinctoria. Both the removal of leaves with and without flooding resulted in higher CO2 emissions due to reductions in photosynthesis. Whilst waterlogging alone was also associated with a reduction in photosynthesis, this was slower than the effect of leaf removal. Significant N2O emissions were associated with intact plants, which increased immediately after leaf removal, or seven days after waterlogging with or without leaf removal. We found positive correlations between CO2 and N2O emissions and petiole and rhizome areas, indicating a size-dependent effect. Our results demonstrate that intact plants of G. tinctoria are a source of N2O emissions, which is enhanced, albeit transiently, by the removal of leaves. Consequently, management interventions on invasive plant populations that involve the removal of above-ground material, or waterlogging, would not only reduce CO2 uptake, but would further compromise the ecosystem GHG balance through enhanced N2O emissions.

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Section: Discussionmentioning

confidence: 99%

Section: N 2 O Fluxesmentioning

confidence: 99%

Section: N 2 O Fluxesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Cutting and Waterlogging on Plant-Related CO2 and N2O Fluxes Associated with the Invasive N-Fixing Species Gunnera tinctoria

Mantoani¹

2021

Diversity

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“…Although 15 N values in soil-emitted N 2 O can sometimes be used to predict sources of N 2 O when combined measurements of 15 N values in substrates for N 2 O production 28 and molecular analysis of N 2 O producing organisms 40 , with data from this trial was not possible to estimate relative contributions of nitrification and denitrification. Moreover, more powerful tools like 15 N site preference (SP) is a good indicator of production pathways 24,73,74 , which was not used in this study, making difficult to generalize dominant process of N 2 O production in different ecosystems.…”

mentioning

confidence: 99%

Nitrogen isotopic signatures and fluxes of N2O in response to land-use change on naturally occurring saline–alkaline soil

Timilsina

Dong

Luo

et al. 2020

Sci Rep

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The conversion of natural grassland to semi-natural or artificial ecosystems is a large-scale land-use change (LUC) commonly occurring to saline–alkaline land. Conversion of natural to artificial ecosystems, with addition of anthropogenic nitrogen (N) fertilizer, influences N availability in the soil that may result in higher N2O emission along with depletion of 15N, while converting from natural to semi-natural the influence may be small. So, this study assesses the impact of LUC on N2O emission and 15N in N2O emitted from naturally occurring saline–alkaline soil when changing from natural grassland (Phragmites australis) to semi-natural [Tamarix chinensis (Tamarix)] and to cropland (Gossypium spp.). The grassland and Tamarix ecosystems were not subject to any management practice, while the cropland received fertilizer and irrigation. Overall, median N2O flux was significantly different among the ecosystems with the highest from the cropland (25.3 N2O-N µg m−2 h−1), intermediate (8.2 N2O-N µg m−2 h−1) from the Tamarix and the lowest (4.0 N2O-N µg m−2 h−1) from the grassland ecosystem. The 15N isotopic signatures in N2O emitted from the soil were also significantly affected by the LUC with more depleted from cropland (− 25.3 ‰) and less depleted from grassland (− 0.18 ‰). Our results suggested that the conversion of native saline–alkaline grassland with low N to Tamarix or cropland is likely to result in increased soil N2O emission and also contributes significantly to the depletion of the 15N in atmospheric N2O, and the contribution of anthropogenic N addition was found more significant than any other processes.

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Effects of long-term nitrogen fertilization on N2O, N2 and their yield-scaled emissions in a temperate semi-arid agro-ecosystem

et al. 2021

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Potential Pathway of Nitrous Oxide Formation in Plants

Cited by 26 publications

References 117 publications

The Effect of Cutting and Waterlogging on Plant-Related CO2 and N2O Fluxes Associated with the Invasive N-Fixing Species Gunnera tinctoria

The Effect of Cutting and Waterlogging on Plant-Related CO2 and N2O Fluxes Associated with the Invasive N-Fixing Species Gunnera tinctoria

Nitrogen isotopic signatures and fluxes of N2O in response to land-use change on naturally occurring saline–alkaline soil

Effects of long-term nitrogen fertilization on N2O, N2 and their yield-scaled emissions in a temperate semi-arid agro-ecosystem

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