Proper organic substitution attenuated both N2O and NO emissions derived from AOB in vegetable soils by enhancing the proportion of Nitrosomonas

Bi, Ruiyu; Xu, Xintong; Zhan, Liping; Chen, Anfeng; Zhang, Qianqian; Xiong, Zhengqin

doi:10.1016/j.scitotenv.2022.161231

Cited by 9 publications

(2 citation statements)

References 55 publications

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“…N 2 O emission increases with the increase of chemical nitrogen fertilizer (urea), with results that are consistent with those of previous authors [38][39][40]. However, some researchers have shown that green manure helps improve N use efficiency and reduces N 2 O emissions [40,41] due to the ability of appropriate organic substitution ratios to influence soil physicochemical properties and ammonia-oxidising bacteria (AOB) community structure, thereby reducing the AOB contribution of N 2 O [42]. In this study, N 2 O emission reached different peaks after applying different amounts of urea (Figure 3a), and the N 2 O emission peaks and seasonal N 2 O emissions had lower values at higher OS-urea substitution ratios (Figure 3).…”

Section: Influence Of Os-urea Substitution Ratio On N 2 O Emissionsupporting

confidence: 88%

Green Manuring with Oilseed Rape (Brassica napus L.) Mitigates Methane (CH4) and Nitrous Oxide (N2O) Emissions in a Rice-Ratooning System in Central China

Yao,

Zhu,

Yang

et al. 2024

Agriculture

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The use of oilseed rape (OS, Brassica napus L.) as a winter green manure is crucial for enhancing soil fertility and reducing chemical N application in paddy fields. However, the impacts of replacing varying amounts of chemical N with OS on CH4 and N2O emissions in paddy soils have not been well evaluated. In this study, GHG emissions, soil properties and OS decomposition in a rice-ratooning system with different OS-urea N replacement rates (0%, 25%, 50%, 75% and 100%) were investigated. Our results indicate that 84.7–90.7% of the initial C and 97.5–98.4% of the N were released during the 192-day decomposition process, and that the mineralization patterns of net C and net N in the OS residue were consistent with a single exponential decay model. The lowest CH4 emissions (9.97 g m−2) were observed at 0% OS, while the highest N2O emissions (0.40 g m−2) were observed at this level of substitution. Conversely, the highest CH4 emissions (20.71 g m−2) and lowest N2O emissions (0.07 g m−2) were observed at 100% OS. Compared to 0% substitution, 25% substitution significantly decreased GWP and GHGI without reducing rice grain yield. Environmental parameters such as soil redox, NH4+-N and residual N and C were shown to be significantly associated with CH4 emissions, whereas soil redox, NH4+-N and residual C were the main drivers of N2O emissions. In conclusion, 25% substitution of OS was the most cost-effective measure for balancing greenhouse gas emission and rice yield.

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Section: Influence Of Os-urea Substitution Ratio On N 2 O Emissionsupporting

confidence: 88%

Green Manuring with Oilseed Rape (Brassica napus L.) Mitigates Methane (CH4) and Nitrous Oxide (N2O) Emissions in a Rice-Ratooning System in Central China

Yao,

Zhu,

Yang

et al. 2024

Agriculture

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“…This suggests that a reduction in AOB abundance can reduce ammonium oxidation activity and potential nitrification process in soil (Kuroiwa et al, 2011), which ultimately leads to lower N 2 O emissions under full substitution of chemical fertilizer by organic manure. Therefore, AOB was the main contributor to N 2 O emissions in the full organic manure substitution treatment, and that N 2 O emissions decreased with decreasing AOB abundance under organic manure substitution (Bi et al, 2023). Secondly, our study found positive relationships between both organic N mineralization and autotrophic nitrification rates with N 2 O emission, confirming our third hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Full substitution of chemical fertilizer by organic manure decreases soil N₂O emissions driven by ammonia oxidizers and gross nitrogen transformations

Hei,

Peng,

Hao

et al. 2023

Global Change Biology

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Replacing synthetic fertilizer by organic manure has been shown to reduce emissions of nitrous oxide (N2O), but the specific roles of ammonia oxidizing microorganisms and gross nitrogen (N) transformation in regulating N2O remain unclear. Here, we examined the effect of completely replacing chemical fertilizer with organic manure on N2O emissions, ammonia oxidizers, gross N transformation rates using a 13‐year field manipulation experiment. Our results showed that organic manure reduced cumulative N2O emissions by 16.3%–210.3% compared to chemical fertilizer. The abundance of ammonia oxidizing bacteria (AOB) was significantly lower in organic manure compared with chemical fertilizer during three growth stages of maize. Organic manure also significantly decreased AOB alpha diversity and changed their community structure. However, organic manure substitution increased the abundance of ammonia oxidizing archaea and the alpha diversity of comammox Nitrospira compared to chemical fertilizer. Interestingly, organic manure decreased organic N mineralization by 23.2%–32.9%, and autotrophic nitrification rate by 10.5%–45.4%, when compared with chemical fertilizer. This study also found a positive correlation between AOB abundance, organic N mineralization and gross autotrophic nitrification rate with N2O emission, and their contribution to N2O emission was supported by random forest analysis. Our study highlights the key roles of ammonia oxidizers and N transformation rates in predicting cropland N2O.

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Ecological intensification strategies increase abundance of denitrifying functional genes in a greenhouse agricultural soil

Hernández Maqueda,

Ballesteros,

Meca

et al. 2024

Applied Soil Ecology

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Proper organic substitution attenuated both N2O and NO emissions derived from AOB in vegetable soils by enhancing the proportion of Nitrosomonas

Cited by 9 publications

References 55 publications

Green Manuring with Oilseed Rape (Brassica napus L.) Mitigates Methane (CH4) and Nitrous Oxide (N2O) Emissions in a Rice-Ratooning System in Central China

Green Manuring with Oilseed Rape (Brassica napus L.) Mitigates Methane (CH4) and Nitrous Oxide (N2O) Emissions in a Rice-Ratooning System in Central China

Full substitution of chemical fertilizer by organic manure decreases soil N₂O emissions driven by ammonia oxidizers and gross nitrogen transformations

Ecological intensification strategies increase abundance of denitrifying functional genes in a greenhouse agricultural soil

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Proper organic substitution attenuated both N2O and NO emissions derived from AOB in vegetable soils by enhancing the proportion of Nitrosomonas

Cited by 9 publications

References 55 publications

Green Manuring with Oilseed Rape (Brassica napus L.) Mitigates Methane (CH4) and Nitrous Oxide (N2O) Emissions in a Rice-Ratooning System in Central China

Green Manuring with Oilseed Rape (Brassica napus L.) Mitigates Methane (CH4) and Nitrous Oxide (N2O) Emissions in a Rice-Ratooning System in Central China

Full substitution of chemical fertilizer by organic manure decreases soil N2O emissions driven by ammonia oxidizers and gross nitrogen transformations

Ecological intensification strategies increase abundance of denitrifying functional genes in a greenhouse agricultural soil

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Full substitution of chemical fertilizer by organic manure decreases soil N₂O emissions driven by ammonia oxidizers and gross nitrogen transformations