Impact of Grazing Intensity and Seasons on Greenhouse Gas Emissions in Tropical Grassland

Cardoso, Abmael da Silva; Brito, Liziane de Figueiredo; Janusckiewicz, Estella Rosseto; Morgado, Eliane da Silva; Barbero, Rondineli Pavezzi; Koscheck, Jefferson Fabiano Werner; Reis, Ricardo Andrade; Ruggieri, Ana Cláudia

doi:10.1007/s10021-016-0065-0

Cited by 41 publications

(31 citation statements)

References 53 publications

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“…Grazing intensity effects CO 2 and N 2 O emissions [12]. Both GHG emissions declined in this study as the grazing intensity decreased.…”

Section: Greenhouse Gasesmentioning

confidence: 51%

“…It has been reported that Brachiaria pastures are not a source of CH 4 . These previous studies suggested that the well-drained conditions of this soil favored CH 4 oxidation, which consequently offset the CH 4 production [12].…”

Section: Greenhouse Gasesmentioning

confidence: 70%

“…Stocking rate in animal unit (AU = 450 kg BW)/ha = ( BWmean/450)/area (ha); Greenhouse gases from the soil were quantified using the static closed chamber method described by Cardoso et al (2017) [12]. The explanatory variables for soil moisture, ammonium, and nitrate were quantified at the 0-20 cm soil depth.…”

Section: Response Variablesmentioning

confidence: 99%

“…Ammonium-N was determined using the Berthelot reaction with spectrometry at 647 nm. Nitrate-N quantification was carried out by ultraviolet absorption spectrometry at 220 [12]. Air temperatures, moisture, precipitation, and solar radiation were obtained from a meteorological station located 500 m away from the study area.…”

Section: Response Variablesmentioning

confidence: 99%

“…Nitrous oxide (N 2 O) is also emitted when excreta and forage residues decompose. Greenhouse gases from the soil are affected by soil structure, particularly compaction, which affects soil moisture, oxygen (O 2 ) availability, and animal emissions [3,12,13]. Grazing Marandu to a 15 cm sward height implies a greater stocking rate, and hence more excretal returns and soil trampling by the animals.…”

Section: Introductionmentioning

confidence: 99%

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Grazing Intensity Impacts on Herbage Mass, Sward Structure, Greenhouse Gas Emissions, and Animal Performance: Analysis of Brachiaria Pastureland

et al. 2020

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A 7 year experiment (2008–2014) evaluated cattle grazing intensity (sward height) effects on herbage mass, forage quality, and greenhouse gas emissions in continuously stocked pastures containing the tropical ‘Marandu’ palisade grass (Brachiaria brizantha (Hochst. ex A. Rich) Stapf cv. Marandu). The experiment consisted of three sward height treatments (15, 25, and 35 cm) and six replicates. There were four periods each year during the rearing phase. Significant effects were found for herbage mass, proportions of leaf and stem, crude protein, neutral detergent fiber, acid detergent fiber, lignin, animal performance, enteric methane (CH4), and greenhouse gas (GHG) emissions from soils. When the canopy height increased from 15 to 35 cm, the herbage mass rose from 5.23 to 9.86 kg t ha−1, leaf percentage decreased, and stem percentage increased. Crude protein content averaged 14.2%, and neutral detergent fiber averaged 58%. Average daily gain averaged 0.67, 0.81, and 0.90 kg −1 head−1, while live weight gain ha–1 was 649, 530, and 439 kg for the 15, 25, and 35 cm treatments, respectively. The weather variables explained the GHG emissions, interannual herbage mass, and structure variations.

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“…Grazing intensity effects CO 2 and N 2 O emissions [12]. Both GHG emissions declined in this study as the grazing intensity decreased.…”

Section: Greenhouse Gasesmentioning

confidence: 51%

Section: Greenhouse Gasesmentioning

confidence: 70%

Section: Response Variablesmentioning

confidence: 99%

Section: Response Variablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Grazing Intensity Impacts on Herbage Mass, Sward Structure, Greenhouse Gas Emissions, and Animal Performance: Analysis of Brachiaria Pastureland

et al. 2020

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Greenhouse gases emissions from tropical grasslands affected by nitrogen fertilizer management

et al. 2020

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Greenhouse gases (GHGs) emissions from livestock systems are important because of their significant contribution to global warming. Nitrogen fertilization can improve system production; however, it alters soil gas emissions. We evaluated soil nitrous oxide (N 2 O), methane (CH 4), and carbon dioxide (CO 2) emissions to investigate how they are affected by increasing levels of N fertilizer (urea) in a productive Marandu grass [Urochloa brizantha (Hochst ex A. Rich) Stapf] pasture subjected to continuous grazing by young Nellore beef cattle (Bos indicus). The N 2 O, CH 4, and CO 2 emissions were significantly affected by increasing N fertilizer levels. The seasons also affected GHGs emissions. Nitrogen fertilizer favored CH 4 consumption relative to the control plot without N, with mean emission of 23.7 μg CH 4 −C m −2 h −1 in the fertilized plots compared to 61.6 μg CH 4 −C m −2 h −1 in the control. The N-fertilized areas presented higher CO 2 emissions compared to the control plot without N. The areas that received N fertilization showed a positive linear association between the water-filled pore space and N 2 O emission. Soil temperature drove CO 2 emissions. Increasing N fertilization in grazed marandu grass increases N 2 O and CO 2 emissions during the growing season, while reducing CH 4. The effect of fertilization during the transition season was not apparent, and perhaps other factors could provide a better explanation for the GHG emissions during this period.

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Biochar impacts on nutrient dynamics in a subtropical grassland soil: 2. Greenhouse gas emissions

Silveira

Cavigelli

et al. 2020

J of Env Quality

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Land application of biochar reportedly provides many benefits, including reduced risk of nutrient transport, greenhouse gas (GHG) emission mitigation, and increased soil C storage, but additional field validation is needed. We evaluated the effectiveness of biochar in controlling the lability of nutrients in agricultural land. This study was designed to evaluate the impacts of biochar co-applied with various N and P sources on GHG fluxes from a subtropical grassland. Nutrients (inorganic fertilizer and aerobically digested Class B biosolids) were surface applied at a rate of 160 kg plant available N ha −1 yr −1 with or without biochar (applied at 20 Mg ha −1). Greenhouse gas (CO 2 , CH 4 , and N 2 O) fluxes were assessed using static chambers and varied significantly, both temporally and with treatments. Greenhouse gas fluxes ranged from 1,247 to 23,160, −0.7 to 42, and −1.4 to 376 mg m −2 d −1 for CO 2 , N 2 O, and CH 4 , respectively. Results of the 3-yr field study demonstrated strong seasonal variability associated with GHG emissions. Nutrient source had no effect on soil CO 2 and CH 4 emissions, but annual and cumulative (3-yr) N 2 O emissions increased with biosolids (8 kg N 2 O ha −1 yr −1) compared with inorganic fertilizer (5 kg N 2 O ha −1 yr −1) application. Data suggested that environmental conditions played a more important role on GHG fluxes than nutrient additions. Biochar reduced CO 2 emissions modestly (<9%) but had no effects on N 2 O and CH 4 emissions.

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Impact of Grazing Intensity and Seasons on Greenhouse Gas Emissions in Tropical Grassland

Cited by 41 publications

References 53 publications

Grazing Intensity Impacts on Herbage Mass, Sward Structure, Greenhouse Gas Emissions, and Animal Performance: Analysis of Brachiaria Pastureland

Grazing Intensity Impacts on Herbage Mass, Sward Structure, Greenhouse Gas Emissions, and Animal Performance: Analysis of Brachiaria Pastureland

Greenhouse gases emissions from tropical grasslands affected by nitrogen fertilizer management

Biochar impacts on nutrient dynamics in a subtropical grassland soil: 2. Greenhouse gas emissions

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