Soil microbial nitrogen-cycling gene abundances in response to crop diversification: A meta-analysis

The Science of The Total Environment, Год журнала: 2022, Номер 838, С. 156621 - 156621

Опубликована: Июнь 9, 2022

Язык: Английский

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Uncertainty in non-CO2 greenhouse gas mitigation contributes to ambiguity in global climate policy feasibility

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Июнь 2, 2023

Despite its projected crucial role in stringent, future global climate policy, non-CO

Язык: Английский

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Carbon-sink potential of continuous alfalfa agriculture lowered by short-term nitrous oxide emission events

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Апрель 6, 2023

Alfalfa is the most widely grown forage crop worldwide and thought to be a significant carbon sink due high productivity, extensive root systems, nitrogen-fixation. However, these conditions may increase nitrous oxide (N2O) emissions thus lowering climate change mitigation potential. We used suite of long-term automated instrumentation satellite imagery quantify patterns drivers greenhouse gas fluxes in continuous alfalfa agroecosystem California. show that this system was large N2O source (624 ± 28 mg m2 y-1), offsetting ecosystem (carbon dioxide (CO2) methane (CH4)) by up 14% annually. Short-term events (i.e., hot moments) accounted for ≤1% measurements but 57% annual emissions. Seasonal daily trends rainfall irrigation were primary moments Significant coherence between satellite-derived photosynthetic activity suggested plant an important driver background Combined data can significantly lower carbon-sink potential agriculture.

Язык: Английский

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Insights into soil NO emissions and the contribution to surface ozone formation in China

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(23), С. 14919 - 14932

Опубликована: Дек. 5, 2023

Abstract. Elevated ground-level ozone concentrations have emerged as a major environmental issue in China. Nitrogen oxide (NOx) is key precursor to formation. Although control strategies aimed at reducing NOx emissions from conventional combustion sources are widely recognized, soil (mainly NO) due microbial processes received little attention. The impact of NO on concentration yet be evaluated. This study estimated China using the Berkeley–Dalhousie Soil Parameterization (BDSNP) algorithm. A typical modeling approach was used quantify contribution surface concentration. brute-force method (BFM) and Ozone Source Apportionment Technology (OSAT) implemented Comprehensive Air Quality Model with Extensions (CAMx) were used. total for 2018 1157.9 Gg N, an uncertainty range 715.7–1902.6 N. Spatially, mainly concentrated Central China, North Northeast northern Yangtze River Delta (YRD), eastern Sichuan Basin, distinct diurnal monthly variations that affected by temperature timing fertilizer application. Both BFM OSAT results indicate substantial maximum daily 8 h (MDA8) 8.0–12.5 µg m−3 average June 2018, being consistently higher than results. also showed led relative increase exceedance days 10.5 %–43.5 % selected regions. Reducing resulted general decrease MDA8 concentrations, magnitude reduction became more pronounced reductions increased. However, even complete emissions, approximately 450.3 million people still exposed unhealthy levels, necessitating multiple policies same time. highlights importance potential future strategy mitigation

Язык: Английский

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The role of conservation agriculture practices in mitigating N2O emissions: A meta-analysis

Agronomy for Sustainable Development, Год журнала: 2023, Номер 43(5)

Опубликована: Сен. 4, 2023

Abstract Conservation agriculture is often assumed to reduce soil N 2 O emissions. Yet, studies analyzing the specific effect of conservation practices on emissions give contradictory results. Herein, we synthesized a comprehensive database three main (cover crops, diversified crop rotations, and no-till and/or reduced tillage (NT/RT)) elucidate role Further, used random meta-forest approach identify most important predictors effects these Averaged across all comparisons, NT/RT significantly decreased by 11% (95% CI: –19 –1%) compared conventional tillage. The reductions due were more commonly observed in humid climates soils with an initial carbon content < 20 g kg –1 . implementation cover crops rotations led variable Cover likely at neutral pH, intermediate (~20 ) nitrogen (~3 contents. Diversified tended increase temperate regions alkaline soils. Our results provide predictive framework understand conditions which adoption various can contribute climate change mitigation. Combining similar mechanistic understanding impacts ecosystem services production will pave way for wider globally management practices.

Язык: Английский

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Cover crop impacts on nitrogen losses and environmental damage cost

Agriculture Ecosystems & Environment, Год журнала: 2024, Номер 363, С. 108859 - 108859

Опубликована: Янв. 11, 2024

There is a need to explore management practices that reduce nitrate (NO3-) leaching and aid in meeting current greenhouse gas reduction goals. Tile drainage involves using perforated pipes remove excess subsurface water from agricultural fields, also removing nutrients. The inclusion of cover crops tile-drained systems the Midwest has been shown NO3- losses potentially strategy mitigate soil nitrous oxide (N2O) emissions. objectives this research were 1) evaluate cumulative N2O with without corn-soybean rotation on landscape and; 2) assess environmental damage cost (EDC) N landscape. Corn (Zea mays L.) was grown 2017, soybean (Glycine max 2018. crop used experiment 92% cereal rye (Secale 8% daikon radish (Raphanus sativus blend. Treatments included inclusion, no zero control, which did not include or receive fertilization. Each treatment replicated three times individually plots established Lexington, IL during 2017 2018 growing seasons. In led NO3– over 50% when compared control. 2018, total identical; however, there an increase emissions across all treatments 2017. Despite apparent tradeoff between loss pathways overall EDC reduced primarily because presence crops. results study indicated resulted sizeable corn year equated 64% two-year rotation.

Язык: Английский

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The effect of upland crop planting on field N2O emission from rice-growing seasons: A case study comparing rice-wheat and rice-rapeseed rotations

Agriculture Ecosystems & Environment, Год журнала: 2023, Номер 347, С. 108365 - 108365

Опубликована: Янв. 23, 2023

Язык: Английский

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Increased N2O emissions by cover crops in a diverse crop rotation can be mediated with dual nitrification and urease inhibitors

Agriculture Ecosystems & Environment, Год журнала: 2024, Номер 374, С. 109178 - 109178

Опубликована: Июль 18, 2024

Agriculture significantly contributes to global soil nitrous oxide (N2O) emissions. Crop rotation diversification and cover cropping are feasible agronomic strategies reduce nitrogen losses the environment. However, input of crop residues could potentially increase N2O Dual nitrification urease inhibitors (NUI) administered after termination at time fertiliser addition emissions, but this has not been widely evaluated in field studies. A 4-year study was conducted determine effect use NUI on yield intensity. Nitrous flux measured year-round using a micrometeorological method deployed four 4-ha fields. Two fields were managed with conventional (CONV) (corn – soybean soybean) two diverse (DIV) winter-wheat plus crops either as 2-species mixture under seeded corn or 4-species harvest). The [N(-n-Butyl) thiophosphoric triamide Pronitridine] tested fourth year. DIV resulted 43 % lower annual emissions when winter wheat grown instead 18–26 for corn. increased intensity by 15 Year 1 36 4 compared CONV rotation. total over 3 years cycle. application 19 reduction within rotation, no observable yield. Further research should focus optimising N rates according use, considering available from integrated into

Язык: Английский

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Available nitrogen and ammonia-oxidizing archaea in soil regulated N2O emissions regardless of rice planting under a double rice cropping-fallow system

Agriculture Ecosystems & Environment, Год журнала: 2022, Номер 340, С. 108166 - 108166

Опубликована: Сен. 12, 2022

Язык: Английский

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Regulatory potential of soil available carbon, nitrogen, and functional genes on N2O emissions in two upland plantation systems

Journal of Integrative Agriculture, Год журнала: 2024, Номер 23(8), С. 2792 - 2806

Опубликована: Янв. 5, 2024

Dynamic nitrification and denitrification processes are affected by changes in soil redox conditions, they play a vital role regulating N2O emissions rice-based cultivation. It is imperative to understand the influences of different upland crop planting systems on emissions. In this study, we focused two representative rotation central China: rapeseed-rice (RR) wheat-rice (WR). We examined biotic abiotic underlying impacts these plantings The results revealed that during rapeseed-cultivated seasons RR system, average were 1.24±0.20 0.81±0.11 kg N ha-1 for first second seasons, respectively. These values comparable observed wheat-cultivated WR system (0.98±0.25 0.70±0.04 ha-1, respectively). This suggests cultivation has minimal systems. Strong positive correlations found between fluxes ammonium (NH4+), nitrate (NO3-), microbial biomass nitrogen (MBN), ratio dissolved organic carbon (DOC) NO3- both Moreover, presence AOA-amoA nirK genes positively associated with systems, implies may have potential roles facilitating production various plantation models. By using structural equation model (SEM), moisture, mineral N, MBN, gene accounted over 50% effects system. had combined impact 70% findings demonstrate interactive functional factors, including physical characteristics, available nitrogen, their ratio, under rice-upland rotations.

Язык: Английский

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