Conversion from rice to vegetable production increases N 2 O emission via increased soil organic matter mineralization

Wu, Lianghuan; Tang, Shuirong; He, Dongdong; Wu, Xian; Shaaban, Muhammad; Wang, Milan; Zhao, Jinsong; Khan, Imran; Zheng, Xunhua; Hu, Ronggui; Horwáth, William R.

doi:10.1016/j.scitotenv.2017.01.050

Cited by 83 publications

(44 citation statements)

References 62 publications

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“…In this study, the source of N 2 O is categorized into denitrification and nitrification processes, namely increased to 0.85 ± 0.1 mg/m 2 ·h at 12 h and reached a maximum of 4.5 ± 0.5 mg/m 2 ·h at 24 h. An increase in the soil nitrate concentration accelerated the denitrification reaction (Pan et al, 2016b;Xi et al, 2016;Wu et al, 2017), leading to an increase in…”

Section: Contribution To Nitrous Oxide Releasementioning

confidence: 87%

“…Soil microbial utilization and biotransformation accounted for (40.2 ± 2.0)%. Nitrogen additioncan induce promising effects in the soil by enhancing microbial transformation of native inorganic and organic nitrogen bound (Wu et al, 2017). As a result, the decomposition of labile organic matter in soil was accelerated as indicated by the higher N 2 O emissions.…”

Section: The Fate Of Nitrate Nitrogen In the Influentmentioning

confidence: 99%

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Identification of Nitrous Oxide Generation in Subsurface Wastewater Infiltration System Filled With Mixed Matrix

Yang

et al. 2020

Journal of Environmental Engineering and Landscape Management

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Subsurface wastewater infiltration systems (SWIS) are one of the important sources of nitrous oxide (N2O) production; understanding the biological processes and contributions of N2O will help control the amount of N2O produced. To quantitatively reveal the contribution of nitrification and denitrifiaction processes, 8 g potassium nitrate with 99.99 atom % 15N (i.e. 15N accounts for 99.99% of the total N) was dissolved in the influent (concentration: 3.3 g/L). Results showed that nitrification released more N2O within 0–12 h, accounting for 79.6 ± 2.4%. The denitrification process accounted for 88.5 ± 1.3% for N2O generation after the 12th hour. Thus, in order to effectively control the release of N2O, the denitrification process should be given more attention. The maximum release rate of N2O was 8.45 ± 0.8 mg/m2·h, which occurred near the end of the first wetting-drying cycle. Since then, peaks appeared periodically, mostly in the “rest” periods.

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Section: Contribution To Nitrous Oxide Releasementioning

confidence: 87%

Section: The Fate Of Nitrate Nitrogen In the Influentmentioning

confidence: 99%

Identification of Nitrous Oxide Generation in Subsurface Wastewater Infiltration System Filled With Mixed Matrix

Yang

et al. 2020

Journal of Environmental Engineering and Landscape Management

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“…A lower emission of N 2 O has been noted under lower O 2 conditions and flooding conditions (Bollmann 2010). Moreover, conversion of flooding to upland substantially increases soil nitrate concentrations and thereby N 2 O emissions could be enlarged (Wu et al 2017). Alternatively, concurrent supply of readily available C, as soil becomes oxic under upland conditions, may produce more N 2 O than N 2 (Kim et al 2012).…”

Section: Introductionmentioning

confidence: 96%

“…Generally, rainfall events increase soil N 2 O fluxes as a consequence of stimulated denitrification facilitated by high moisture (Kim et al 2012). However, excessive moisture condition such as flooded conditions can suppress emissions of N 2 O through its reduction to N 2 because of complete denitrification (Wu et al 2017). A lower emission of N 2 O has been noted under lower O 2 conditions and flooding conditions (Bollmann 2010).…”

Section: Introductionmentioning

confidence: 99%

N2O, CH4, and CO2 Emissions from Continuous Flooded, Wet, and Flooded Converted to Wet Soils

Khalid

Shaaban

2019

J Soil Sci Plant Nutr

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Fluctuations in soil water content, either anthropogenic or natural, can remarkably influence the C and N pools in arable lands. The dynamics of C and N are directly related in regulation of greenhouse gases (GHGs) emissions. The present study was conducted to explore the effects of water regimes (continuous flooding, continuous wet, and flooding converted to wet) on soil GHGs emissions. Nitrous oxide (N 2 O) emissions from continuous flooding treatment were lower as compared with the continuous wet soil, but significantly (p ≤ 0.01) enlarged in the flooding converted to wet soil treatment through increased mineral nitrogen. Methane (CH 4) emissions were significantly (p ≤ 0.01) higher in the continuous flooding when compared with the wet soil conditions but substantially decreased in the flooding converted to wet soil treatment. Carbon dioxide (CO 2) emissions were significantly (p ≤ 0.01) larger in the flooding converted to wet soil treatment as compared with the continuous flooding and wet soil treatments owing to increased mineralization and C contents. The results suggest that converting flooding to wet soil can substantially triggers the C and N pools and thus influences the GHGs emissions from soil.

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“…Currently, urbanization has been increasing worldwide with rapid transition of populations from rural to urban, which means sharply increasing demands for grain and vegetables [37], and causing large amounts of conventional paddy fields have been converted from low nitrogen input "cereal cultivation" to high nitrogen input "vegetable cultivation" [38,39]. These conversions have inevitably entailed extensive soil acidification and changes in microbial communities.…”

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confidence: 99%

The exacerbation of soil acidification correlates with structural and functional evolution of the soil microbiome upon long-term agricultural intensification

Shen¹,

Luo²,

Li³

et al. 2020

Preprint

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Background: Agricultural intensification induces prolonged impacts on soil acidification (SA), whereas linking the mechanisms therein to structural and functional evolution of soil microbiota remain unclear, especially over longer time scales. Methods: To investigate the short- and long-term effects of agricultural intensification on soil microbiome and its association with SA severity, we performed metagenomic sequencing of soil samples from typical rice-vegetable rotations for 0 (control, V0), 10 (V10), 20 (V20) years. The objectives were to clarify biomarkers that indicative of SA and its putative functions of acid production. Results: Rice-vegetable rotations for 0, 10, 20 years yielded three well-defined soil clusters with differential acid saturation (V0: 4.5%; V10: 11.8%; V20: 40.7%). Soil pH declined significantly (p < 0.05) from the 6.38 (V0) to 4.82 (V20). Acid cations (H + , Al 3+ ) dominating V20’s exchangeable cation pool, suggesting that soils in V20 were highly acidic and acid-sensitive, which recruited distinct microbiomes. The increased acid cations and NO 3 - -N concentrations are driving forces that lead to a higher abundance of Rhodanobacter , Gemmatirosa , Sphingomonas and Streptomyces in V20 samples, which acting as aciduric biomarkers that significantly and positively correlated with soil acidity. Furthermore, functional modules of microbial genes revealed V20 samples contained more genes associated with“oxidative phosphorylation” and “two-component system”, particularly enriched multiple pathways of cytoplasmic pH homeostasis. More specifically, we found increased genetic abundances of active efflux of protons and cytoplasmic proton consumption in V20 samples over than in V0, which are both involved in the microbial dehydrogenation and acid production, and favoured the growth of Rhodanbacter , Gemmatirosa , Sphingomonas , Streptomyces . Conclusions: Collectively, the identified aciduric biomarkers was closely associated with SA severity in intensive agroecosystems. An overall increase with the ongoing of intensive cropping history in the abundance of indicative genes associated with dehydrogenation and acid production pathways. The differential community compositions provide new clues to elucidate the interaction between the soil microbiome and SA severity, and varying dehydrogenation and acid production pathways provide novel insights into the exacerbation of SA. Keywords: Agricultural intensification, Soil acidification, Metagenomics, Soil microbiome, pH homeostasis

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Conversion from rice to vegetable production increases N 2 O emission via increased soil organic matter mineralization

Cited by 83 publications

References 62 publications

Identification of Nitrous Oxide Generation in Subsurface Wastewater Infiltration System Filled With Mixed Matrix

Identification of Nitrous Oxide Generation in Subsurface Wastewater Infiltration System Filled With Mixed Matrix

N2O, CH4, and CO2 Emissions from Continuous Flooded, Wet, and Flooded Converted to Wet Soils

The exacerbation of soil acidification correlates with structural and functional evolution of the soil microbiome upon long-term agricultural intensification

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