Regional Modeling of Ammonia Emissions from Native Soil Sources in California

Potter, Christopher; Klooster, Steven; Krauter, Charles

doi:10.1175/1087-3562(2003)007<0001:rmoaef>2.0.co;2

Cited by 14 publications

(11 citation statements)

References 42 publications

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“…•d)) in Inner Mongolian grasslands, which is similar to that reported in Canberra, Australia (Denmead et al, 1974). The soil NH 3 emissions in the grazing season ranged from 9.6 to 19.0 kg N/hm 2 (averaged as 14.3 kg N/hm 2 ), which was consistent with the results from Australian grazed pastures (Eckard et al, 2003), but higher than the results from the grazing grasslands in Yellowstone National Park (Frank and Zhang, 1997) and in Californian native grassland soil (Potter et al, 2003). The lower air temperature and higher precipitation in 2009 may partly explain the lower soil NH 3 emissions in 2009 than in 2010.…”

Section: Effects Of Grazing On Soil Nh 3 Emissionssupporting

confidence: 83%

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Zhang

et al. 2013

J. Arid Land

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Ammonia (NH 3) emission and redeposition play a major role in terrestrial nitrogen (N) cycles and can also cause environmental problems, such as changes in biodiversity, soil acidity, and eutrophication. Previous field grazing experiments showed inconsistent (positive, neutral, and negative) NH 3 volatilization from soils in response to varying grazing intensities. However, it remains unclear whether, or to what extent, NH 3 emissions from soil are affected by increasing grazing intensities in Inner Mongolian grasslands. Using a 5-year grazing experiment, we investigated the relationship between NH 3 volatilization from soil and grazing pressure (0.0, 3.0, 6.0, and 9.0 sheep/hm 2) from June to September of 2009 and 2010 via the vented-chamber method. The results show that soil NH 3 volatilization was not significantly different at different grazing intensities in 2009, although it was higher at the highest stocking rate during 2010. There was no significant linear relationship between soil NH 3 volatilization rates and soil NH 4 +-N, but soil NH 3 volatilization rates were significantly related to soil water content and air temperature. Grazing intensities had no significant influence on soil NH 3 volatilization. Soil NH 3 emissions from June to September (grazing period), averaged over all grazing intensities, were 9.6±0.2 and 19.0±0.2 kg N/hm 2 in 2009 and 2010, respectively. Moreover, linear equations describing monthly air temperature and precipitation showed a good fit to changes in soil NH 3 emissions (r=0.506, P=0.014). Overall, grazing intensities had less influence than that of climatic factors on soil NH 3 emissions. Our findings provide new insights into the effects of grazing on NH 3 volatilization from soil in Inner Mongolian grasslands, and have important implications for understanding N cycles in grassland ecosystems and for estimating soil NH 3 emissions on a regional scale.

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Section: Effects Of Grazing On Soil Nh 3 Emissionssupporting

confidence: 83%

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Zhang

et al. 2013

J. Arid Land

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“…The key innovation here, compared with the previous models of Dawson (1977), Langford et al (1992) and Potter et al (2003), relates to the sources of exchangeable NH 4 + in the soil. The concentration of exchangeable NH 4 + in the soil solution is first determined from the processes of nitrification, net N mineralization by the litter and soil, N 2 fixation and N assimilation into the plants.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Ammonia volatilization. Ammonia (NH 3 ) is the dominant gaseous base in the atmosphere, yet remains poorly characterized; the importance of natural emissions of NH 3 from soils and vegetation is still not well quantified observationally (Langford et al, 1992;Dentener & Crutzen, 1994;Potter et al, 2003). However, the essential processes involved in NH 3 volatilization are known, and can be modelled.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Dawson (1977) and Langford et al (1992) circumvented this limitation by relating soil parameters to more readily available climatic information and developed a model that predicts large-scale emissions from undisturbed soils. The key innovation here, compared with the previous models of Dawson (1977), Langford et al (1992) and Potter et al (2003), relates to the sources of exchangeable NH 4 1 in the soil. The concentration of exchangeable NH 4 1 in the soil solution is first determined from the processes of nitrification, net N mineralization by the litter and soil, N 2 fixation and N assimilation into the plants.…”

Section: Model Descriptionmentioning

confidence: 99%

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Terrestrial nitrogen cycle simulation with a dynamic global vegetation model

Xu-Ri

Prentice

2008

Global Change Biology

179

159

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A global scale Dynamic Nitrogen scheme (DyN) has been developed and incorporated into the Lund-Posdam-Jena (LPJ) dynamic global vegetation model (DGVM). The DyN is a comprehensive process-based model of the cycling of N through and within terrestrial ecosystems, with fully interactive coupling to vegetation and C dynamics. The model represents the uptake, allocation and turnover of N in plants, and soil N transformations including mineralization, N 2 fixation, nitrification and denitrification, NH 3 volatilization, N leaching, and N 2 , N 2 O and NO production and emission. Modelled global patterns of site-scale nitrogen fluxes and reservoirs are highly correlated to observations reported from different biomes. The simulation of site-scale net primary production and soil carbon content was improved relative to the original LPJ, which lacked an interactive N cycle, especially in the temporal and boreal regions. Annual N uptake by global natural vegetation was simulated as 1.084 Pg N yr À1 , with lowest values o1 g N m À2 yr À1 (polar desert) and highest values in the range 24-36.5 g N m À2 yr À1 (tropical forests). Simulated global patterns of annual N uptake are consistent with previous model results by Melillo et al. The model estimates global total nitrogen storage potentials in vegetation (5.3 Pg N), litter (4.6 Pg N) and soil ( ! 67 Pg as organic N and 0.94 Pg as inorganic N). Simulated global patterns of soil N storage are consistent with the analysis by Post et al. although total simulated N storage is less. Deserts were simulated to store 460 Tg N (up to 0.262 kg N m À2 ) as NO 3 À , contributing 80% of the global total NO 3 À inventory of 580 Tg N. This model result is in agreement with the findings of a large NO 3 À pool beneath deserts. Globally, inorganic soil N is a small reservoir,comprising only 1.6% of the global soil N content to 1.5 m soil depth, but the ratio has a very high spatial variability and in hot desert regions, inorganic NO 3 À is estimated to be the dominant form of stored N in the soil.

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“…The RoMANS investigators observed a repeating diurnal pattern in gaseous NH 3 concentration within the park, suggesting that a local temperature‐dependent source may be present (Malm et al, 2009). However, several processes can contribute to the diurnal concentration cycle, including mountain‐valley flow regimes, bidirectional behavior from vegetation, dew, and diel temperature‐dependent emissions from soils (Potter et al, 2003; Malm et al, 2009; Rodriguez et al, 2011; Wentworth et al, 2016). …”

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confidence: 99%

Ammonia Emissions from Subalpine Forest and Mountain Grassland Soils in Rocky Mountain National Park

Stratton

Ham

2018

J of Env Quality

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Atmospheric deposition of NH and NH contributes to eutrophication within sensitive subalpine ecosystems of Rocky Mountain National Park (RMNP) in the United States. However, little is known about the local contribution of NH from soils within the park. Thus, the goal of this study was to quantify and compare NH emissions from intact soil cores sampled from a subalpine grassland and forest within RMNP. Cores were collected at 2-wk intervals from 20 June 2011 to 12 Sept. 2011 and transferred to a laboratory chamber system for NH flux measurements. Additionally, N wet deposition was monitored at the sampling location to investigate possible impacts on NH soil emissions. The average quantifiable NH emissions (with SDs) from intact soil cores analyzed in the laboratory (23°C) were 0.42 ± 0.30 mg NH-N m d for grassland soil and 0.21 ± 0.03 mg NH-N m d for forest soil ( < 0.001). A mechanistic model was developed to estimate the impact of temperature on soil emissions using the chamber data and field-site air temperatures. Average estimated NH emissions from the field site over the study period were 0.21 and 0.082 mg NH-N m d for grasslands and forests, respectively. Ammonium wet deposition was not correlated to short term reemission of NH based on N isotope analysis. This work provides new information on the magnitude of NH emissions from native subalpine soils, indicating that natural emissions are not likely major sources of NH in the RMNP airshed.

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Regional Modeling of Ammonia Emissions from Native Soil Sources in California

Cited by 14 publications

References 42 publications

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Terrestrial nitrogen cycle simulation with a dynamic global vegetation model

Ammonia Emissions from Subalpine Forest and Mountain Grassland Soils in Rocky Mountain National Park

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