Greenhouse gas fluxes from a grazed grassland soil after slurry injections and mineral fertilizer applications under the Atlantic climatic conditions of NW Spain

Louro, Aránzazu; Cardenas, L. M.; García, María Isabel; Báez, D.

doi:10.1016/j.scitotenv.2016.08.092

Cited by 10 publications

(4 citation statements)

References 51 publications

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“…The impact of livestock grazing on GHG emissions has long been recognized 24–27 , but only a few studies have looked at the effect of different grazing management (e.g. rotational versus continuous grazing) on GHG emissions on the Tibetan grassland 28–30 .…”

Section: Discussionmentioning

confidence: 99%

Tibetan sheep grazing modifies rodent density and their interactions effect on GHG emissions of alpine meadow

Wang

Yuan

Zhang

et al. 2019

Sci Rep

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Digging and mound-building by rodents lead to considerable disturbances in the topsoil and may affect plant composition, soil properties. However, little is known about the effects of these activities on GHG emissions, especially under different grazing management. This paper aimed to measure changes in CO2 and CH4 efflux with varying grazing management during the warm and cold seasons and to relate CO2 and CH4 efflux to pika burrow density and zokor mound density with different grazing management. Results of this study showed that CO2 efflux was significantly affected by the grazing season, whereas CH4 efflux was significantly affected by the grazing system. There were significant relationships between GHG efflux and rodent population density which were regulated by grazing management. CO2 efflux increased linearly with rodent density under seasonal continuous grazing in warm season. CO2 and CH4 efflux and rodent population density showed a significant quadratic convex relationship under rotational grazing at 24 SM/ha in warm and cold seasons and rotational grazing at 48 SM/ha in cold season. Under rotational grazing at light stocking rate (24 SM/ha), appropriate populations of rodents were beneficial for decreasing GHG emissions. This results also used to help drive a best-practices model for grazing practices of local herders.

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Section: Discussionmentioning

confidence: 99%

Tibetan sheep grazing modifies rodent density and their interactions effect on GHG emissions of alpine meadow

Wang

Yuan

Zhang

et al. 2019

Sci Rep

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“…It seems undoubted, that the high N 2 O emissions after slurry injection are mainly the result of enhanced denitrification (e.g., [18,88]), and consequently, slurry injection may be a suitable technique for NH 3 mitigation at production sites with a low denitrification potential. Low EFs for organic fertilizers have been reported for the Mediterranean region with low precipitation [89], and consequently, Louro et al [90] did not find any effect of slurry injection on N 2 O emissions. On well aerated sandy soils, slurry injection might also help to improve NH 3 reduction with only a small increase in N 2 O emission, but other factors like high humus contents may counteract N 2 O mitigation [91].…”

Section: Effect Of Environmental Conditions and Nis On Nnnual N 2 O Emission And Corresponding Efsmentioning

confidence: 91%

Effect of Nitrification Inhibitors on N2O Emissions after Cattle Slurry Application

Herr

Mannheim²,

Müller

et al. 2020

Agronomy

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Cattle slurry injection (INJ) has shown to be an efficient measure to reduce ammonia (NH3) losses from soils but it might also significantly increase nitrous oxide (N2O) emissions, which can dominate the total greenhouse gas (GHG) release in silage maize production (Zea mays L.). Nitrification inhibitors (NIs) are known for their potential to mitigate N2O. Therefore, we tested the effect of NIs added to cattle slurry before INJ on N2O fluxes from a Haplic Luvisol under silage maize in southwest Germany. We determined N2O fluxes at least weekly, with the closed chamber method over two full years. NIs differ in their chemical and physical behavior and we therefore tested a range of commercially available NIs: 3,4-dimethylpyrazole phosphate, 3,4-dimethylpyrazol succinic acid, a mixture of both, nitrapyrin, dicyandiamide, and 1,2,4 triazol and 3-methylpyrazol. Although not significant, INJ treatments with NI showed lower mean annual N2O emissions than the INJ treatment without NI in the 1st year. The emission reduction by NI of 46% in the 2nd year was statistically significant. In both years, we did not find any difference in N2O release, crop yield, or nitrogen removal between the different NI treatments. In the 1st year, which was extraordinary dry and warm, emission factors (EFs) for all INJ treatments were 4 to 8-fold higher than default EF from the IPCC. Even in the 2nd year, only three NI treatments reached EFs within the range provided by the IPCC. Direct N2O accounted for between 81 and 91% of the total GHG emission. Area- and yield-related GHG emission of the broadcast application with subsequent incorporation was in both years in the statistical class with lowest emission. In contrast, INJ with NIs showed similar GHG emissions in only one year, and consequently, incorporation was found to be the optimum management practice for livestock farmers in our study region.

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“…This position is strongly in agreement with a recent life cycle assessment (LCA) study at the study site (the NWFP), which found that amongst all sources of uncertainty surrounding carbon footprints of grazing enterprises, uncertainty associated with N 2 O EFs is the largest, and therefore hedging the risk through a mixed strategy would be a sensible approach ( Takahashi et al, 2019 ). In this context, other on-farm options that could contribute to the solution package include: light interception control through manipulation of sward structure ( Congio et al, 2019 ); fertiliser selection to enhance pasture growth and thus the stocking rate ( Louro et al, 2016 ); diet formulation to control N load and urination volume ( Marsden et al, 2016 ); and direct control of grazing intensity ( Tang et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Elucidating three-way interactions between soil, pasture and animals that regulate nitrous oxide emissions from temperate grazing systems

McAuliffe

López-Aizpún

Blackwell

et al. 2020

Agriculture, Ecosystems & Environment

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Highlights Urinary nitrogen concentrations were lowest on animals consuming high sugar grasses. However, soil under high sugar grasses recorded the highest N 2 O emissions. Synthetic urine generated N 2 O emissions inconsistent with locally collected urine. Differences in emissions amongst systems were explained by gene abundance ratios. Results indicate the importance of soil-pasture-animal-microbiome interactions.

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Greenhouse gas fluxes from a grazed grassland soil after slurry injections and mineral fertilizer applications under the Atlantic climatic conditions of NW Spain

Cited by 10 publications

References 51 publications

Tibetan sheep grazing modifies rodent density and their interactions effect on GHG emissions of alpine meadow

Tibetan sheep grazing modifies rodent density and their interactions effect on GHG emissions of alpine meadow

Effect of Nitrification Inhibitors on N2O Emissions after Cattle Slurry Application

Elucidating three-way interactions between soil, pasture and animals that regulate nitrous oxide emissions from temperate grazing systems

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