A five-year study of the impact of nitrogen addition on methane uptake in alpine grassland

Yue, Ping; Li, Kaihui; Gong, Yanming; Hu, Yukun; Mohammat, Anwar; Christie, Peter; Liu, Xuejun

doi:10.1038/srep32064

Cited by 37 publications

(25 citation statements)

References 44 publications

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“…Seven N rates of 0, 0.5, 1, 2, 3, 6, 12, and 24 g N ∙ m −2 yr −1 of urea and seven P rates of 0, 0.05, 0.1, 0.2, 0.4, 0.8, 1.6, and 3.2 g P ∙ m −2 yr −1 of KH 2 PO 4 were applied. The determination of these application rates was based on a previous study in grassland from Bayanbulak, Xinjiang, China 40 . Treatments were laid out in a randomized block design with four replicate plots that are 3 m × 2 m size.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen and phosphorus addition differentially affect plant ecological stoichiometry in desert grassland

Liu

Gao

et al. 2019

Sci Rep

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Plant C:N:P stoichiometric relations drive powerful constraints on ecological interactions and processes. However, information about plant stoichiometric responses to N and P availability in desert grassland is limited. We conducted two field experiments with 7 levels of N (from 0.5 g to 24 g N ∙ m−2 yr−1) and P (from 0.05 g to 3.2 g P ∙ m−2 yr−1) additions in a desert grassland of Kunlun Mountain in the northwest of China to investigate the effects of these addition rates on the N and P stoichiometry of the dominant grass species Seriphidium korovinii. Nitrogen and P additions both affected plant stoichiometry. N addition suppressed P concentrations, whereas P addition had no effect on plant N concentrations. The N:P ratios of green aboveground biomass (AGB) were positively correlated with N addition ranging from 14.73 to 29.08, whereas those for P additions decreased ranging from 14.73 to 8.29. N concentrations were positively correlated with soil available N:P ratios, whereas, P concentrations were negatively correlated with soil availably N:P. Our results suggest that chemistry and stoichiometry of S. korovinii was directly affected by soil nutrient availability. Soil N availability affects S. korovinii stoichiometry to a greater extent that does soil P availability in this ecosystem. These findings suggest that N-deposition could affect the stoichiometry of this desert grassland ecosystem, and thereby potentially alter litter decomposition, plant community composition, nutrient cycling, and food-web dynamics of these desert ecosystems.

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Section: Methodsmentioning

confidence: 99%

Nitrogen and phosphorus addition differentially affect plant ecological stoichiometry in desert grassland

Liu

Gao

et al. 2019

Sci Rep

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“…Rainfall increased WFPS levels, which create appropriate conditions for anaerobic denitrification (Smith et al, 2003). Several studies have reported that an increase in soil moisture stimulates N 2 O emission (Cardoso et al, 2016;Yue et al, 2016;Zhang et al, 2014). Soil temperature and air temperature, in addition to other factors, are also commonly reported as regulators of N 2 O production.…”

Section: Nitrous Oxide Emissionsmentioning

confidence: 99%

“…Previous studies on the effect of N fertilization on CH 4 production or consumption have been inconclusive. Some studies have shown that N addition increases CH 4 emissions (Bodelier & Laanbroek, 2004;Mori & Hojito, 2015), stimulates CH 4 oxidation (Cardoso et al, 2019a(Cardoso et al, , 2019bZanatta, Bayer, Vieira, Gomes, & Tomazi, 2010), or has no effect (Tate et al, 2007;Yue et al, 2016). The effect of N on CH 4 emissions is probably confounded by or differs according to soil temperature and water content.…”

Section: Introductionmentioning

confidence: 99%

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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“…Across the studies in our dataset, the N and P treatments fell within the ranges 0 ~ 200 kg N ha ‐1 yr ‐1 and 0 ~ 200 kg P ha ‐1 yr ‐1 (Mori et al ; Zheng et al ) respectively. The non‐growing season CH 4 flux is normally not available for most field experiments, therefore, the annual rate of CH 4 uptake (kg C‐CH 4 ha −1 year −1 ) thereafter was calculated by the ratio of the growing season to non‐growing season CH 4 uptake as reported by a few studies (Li et al ; Yue et al ).…”

Section: Methodsmentioning

confidence: 99%

Phosphorus alleviation of nitrogen‐suppressed methane sink in global grasslands

et al. 2020

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Grassland ecosystems account for more than 10% of the global CH 4 sink in soils. A 4-year field experiment found that addition of P alone did not affect CH 4 uptake and experimental addition of N alone significantly suppressed CH 4 uptake, whereas concurrent N and P additions suppressed CH 4 uptake to a lesser degree. A meta-analysis including 382 data points in global grasslands corroborated these findings. Global extrapolation with an empirical modelling approach estimated that contemporary N addition suppresses CH 4 sink in global grassland by 11.4% and concurrent N and P deposition alleviates this suppression to 5.8%. The P alleviation of N-suppressed CH 4 sink is primarily attributed to substrate competition, defined as the competition between ammonium and CH 4 for the methane mono-oxygenase enzyme. The N and P impacts on CH 4 uptake indicate that projected increases in N and P depositions might substantially affect CH 4 uptake and alter the global CH 4 cycle.

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A five-year study of the impact of nitrogen addition on methane uptake in alpine grassland

Cited by 37 publications

References 44 publications

Nitrogen and phosphorus addition differentially affect plant ecological stoichiometry in desert grassland

Nitrogen and phosphorus addition differentially affect plant ecological stoichiometry in desert grassland

Greenhouse gases emissions from tropical grasslands affected by nitrogen fertilizer management

Phosphorus alleviation of nitrogen‐suppressed methane sink in global grasslands

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