Modeling nitrous oxide emissions from organic and conventional cereal-based cropping systems under different management, soil and climate factors

Doltra, Jordi; Olesen, Jørgen E.; Báez, D.; Louro, Aránzazu; Chirinda, Ngonidzashe

doi:10.1016/j.eja.2015.02.002

Cited by 13 publications

(4 citation statements)

References 45 publications

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“…In particular it would be useful to better know, among fertilization management strategies, which ones are more strongly affected by a more or less pronounced aridity or precipitation variability. Process based models are complementary to site specific studies in that they have the potential to integrate a range of processes and to study the interactions between pedoclimatic conditions and agricultural management practices (De Antoni-Migliorati et al, 2015;Doltra et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Precipitation gradient and crop management affect N2O emissions: Simulation of mitigation strategies in rainfed Mediterranean conditions

Plaza‐Bonilla¹,

Léonard²,

Peyrard³

et al. 2017

Agriculture, Ecosystems & Environment

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In Mediterranean areas high precipitation variability and crop dependence on soil water availability make the interaction between climate and agricultural management a key issue for mitigating N2O emissions. In this study we used the STICS model to capture the effect of a water deficit gradient and precipitation variability on N2O emissions and mitigation strategies (i.e. N fertilizer type, grain legumes introduction in crop rotations and crop residues management) in a rainfed Mediterranean transect (HWD-Senés, MWD-Selvanera and LWD-Auzeville, i.e. high, medium and low water deficit, respectively). The model was first tested against a database of daily N2O fluxes measured during twelve growing seasons of winter crops at the LWD site. Several scenarios were then run on each site, always over 9 successive growing seasons to take into account precipitation variability. STICS showed a good ability to simulate the driving variables of N2O fluxes at the daily time scale. The mean observed and simulated cumulative emissions during the growing season were 0.71 and 0.82 kg N2O-N ha-1 , respectively. The simulated N2O emissions (mean of all scenarios) decreased with increasing water deficit being 2.51, 0.65 and 0.26 kg N2O-N ha-1 yr-1 for LWD-Auzeville, MWD-Selvanera and HWD-Senés, respectively, which is consistent with published results. The lower N2O emissions in the driest sites were not only related to lower fertilization rates but also to other factors associated with the Mediterranean characteristics, particularly, the drier water regime. Simulated N2O emissions were highly sensitive to the interannual variability of the climatic conditions. According to the simulations, urea fertilizer would lead to slightly higher N2O emissions (+6 and +8%) than ammonium-and calcium nitrate, respectively. The incorporation of winter pea in the traditional cereal-based Mediterranean rotations would reduce by ca. 22% the N2O emissions in HWD-Senés without changing wheat yields. Differently, in MWD-Selvanera and LWD-Auzeville, N2O emissions would remain unchanged since the emissions associated to the decomposition of low C:N ratio pea residues would 3 counteract the lower application of N fertilizer. The systematic removal of crop residues at LWD-Auzeville would decrease the N2O emissions by 20%. However, this practice seems not recommendable if tillage is practiced due to the concomitant decrease of soil organic matter, fact that would worsen the C footprint of the system and increase the susceptibility to soil erosion. Our work highlights the interest of combining experimental and modelling approaches to account for climatic variability and evaluate long-term effects of N2O mitigation practices under Mediterranean conditions.

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Section: Introductionmentioning

confidence: 99%

Precipitation gradient and crop management affect N2O emissions: Simulation of mitigation strategies in rainfed Mediterranean conditions

Plaza‐Bonilla¹,

Léonard²,

Peyrard³

et al. 2017

Agriculture, Ecosystems & Environment

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“…Soil N 2 O is predominantly produced by microbial-mediated nitrification and denitrification ( Doltra et al., 2015 ). In alpine meadows, soil N 2 O is primarily produced through nitrification rather than denitrification in the growing season ( Du et al., 2016 ; Yan et al., 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Reclamation intensifies the positive effects of warming on N2O emission in an alpine meadow

et al. 2023

Front. Plant Sci.

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Climatic warming can alter grassland nitrous oxide (N2O) emissions due to soil property alterations. However, how the reclamation affect grassland N2O flux under warming conditions remains unclear in alpine meadow ecosystems. We conducted a long-term manipulative warming experiment in a natural alpine meadow and a cultivated grassland on the Qinghai-Tibetan Plateau to explore the separate and interactive effects of warming and reclamation on the soil N2O emission flux. N2O fluxes were measured under four treatments including control (CK), warming (W), reclamation (R) and warming under reclamation (WR) from August 2018 to July 2019. We measured the content of soil C, N nutrients and 5 enzymatic activities in 2018 and 2019. Correlation analysis and structural equation modeling were used to clarify how soil N availability and soil enzyme activities affect N2O emission. Our results indicated that compared to the ambient conditions for the growing and non-growing seasons, soil N2O flux was significantly increased 59.1% and 152.0% by warming and 28.4% and 142.4% by reclamation, respectively. Compared with W, WR significantly increased N2O flux by 18.9% and 81.1% during the growing and non-growing seasons, respectively. Soil moisture was negatively correlated to enzymatic activity and N2O flux. Both warming and reclamation promoted soil nitrification by increasing related enzymatic activities that acted to increase the N2O flux. Reclamation resulted in a greater sensitivity of the activity of ammonia monooxygenase and hydroxylamine oxidoreductase to warming, thus enhancing the effects of warming on increasing the N2O flux. Our research indicated that reclamation can additionally increase the effects of warming on N2O emissions for alpine meadows. Therefore, excessive expansion of arable land should be avoided, and new reclamation sites should be planned scientifically, as warming is expected to intensify in the future.

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“…N 2 O emissions related to fertility management practices were also identi ed as a critical driver of differences in the carbon footprints of the crops considered across regions. The magnitude of eld-level N 2 O emissions may be impacted by a number of factors, including amounts and types of N fertilizers applied 31 , and regional climate and management factors, particularly related to crop residue management 32,33 . For example, Australian N 2 O emissions were found to be lower than any other country in this analysis due to arid climate conditions and low fertilizer application rates, while France and Germany were found to have relatively high eld-level N 2 O emissions due to their higher rates of fertilizer application and precipitation [12][13][14] .…”

Section: Discussionmentioning

confidence: 99%

Carbon footprints of commodity field crops in global markets

Bamber,

Turner,

Pelletier

2023

Preprint

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Sustainability attributes are increasingly a source of competitive advantage for commodity crops in international markets, but fair comparisons are difficult given the diversity of agronomic environments and practices, complex supply chains, and heterogeneity in assessment methods and supporting data quality/availability. We adapted and applied a framework to transparently identify and source best available data, consistently model, and compare the carbon footprints of rapeseed, wheat and field peas produced in Canada, Australia, France, Germany and the United States. Canadian crops, especially those produced in the province of Saskatchewan, had much lower carbon footprints than the same crops produced in other countries when soil carbon changes were included and, in most cases, also when they were excluded. Transportation-to-market makes small contributions to global food system emissions, but is proportionately more important for low impact crops. For Saskatchewan crops, however, these emissions were more than offset by low production-related emissions in most cases.

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Modeling nitrous oxide emissions from organic and conventional cereal-based cropping systems under different management, soil and climate factors

Cited by 13 publications

References 45 publications

Precipitation gradient and crop management affect N2O emissions: Simulation of mitigation strategies in rainfed Mediterranean conditions

Precipitation gradient and crop management affect N2O emissions: Simulation of mitigation strategies in rainfed Mediterranean conditions

Reclamation intensifies the positive effects of warming on N2O emission in an alpine meadow

Carbon footprints of commodity field crops in global markets

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