Landscape patterns of CH4 fluxes in an alpine tundra ecosystem

West, Ann E.; Brooks, P. D.; Fisk, Melany C.; Smith, Lesley K.; Holland, Elisabeth A.; Jaeger, C. H.; Babcock, Scott; Lai, Roberto; Schmidt, Steven K.

doi:10.1007/bf00993002

Cited by 32 publications

(38 citation statements)

References 42 publications

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“…In our study, the methane emission rate from alpine wetland vegetation in the Zoige Plateau in Southwest China, 9.6 ± 3.4 mg CH 4 m −2 h −1 (mean ± SD, n = 6), was little higher than that from other alpine wetlands (Jin et al 1999;West …”

Section: Methane Emission and Its Diurnal Patternmentioning

confidence: 49%

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Chen

Yao

et al. 2009

Environ Monit Assess

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Alpine wetland is a source for CH 4 , but little is known about methane emission from such wetland, especially about its diurnal pattern. In this study we tried to probe the diurnal variation in methane emission from alpine wetland vegetation. The average methane emission rate was 9.6 ± 3.4 mg CH 4 m −2 h −1 . There was an apparent diurnal variation pattern in methane emission with one minor peak at 06:00 and a major one at 15:00. The sunrise peak was consistent with a two-way transport mechanism for plants (convective at daytime and diffusive at night-time). CH 4 emission was found significantly correlated with redox potentials. The afternoon peak could not be explained by diurnal variation in soil temperature, but could be attributable to changes in CH 4 oxidation and production driven by plant gas transport mechanism. The results have important implications for sampling and scaling strategies for estimating methane emission from alpine wetlands.

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Section: Methane Emission and Its Diurnal Patternmentioning

confidence: 49%

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Chen

Yao

et al. 2009

Environ Monit Assess

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“…Many studies have reported increased litter decomposition rates as a result of N fertilization of forests I (Aber et al, 1989;Fenn, 1991), while other studies have reported slower decomposition (Adams and Angradi, 1996;Magill and Aber, 1998). Finally, there is some evidence that elevated N deposition may also inhibit methane production (Neff et al, 1994;West et al, 1998). For policy makers, this area probably needs more research to refine numbers and extend our understanding to other natural ecosystems.…”

Section: Carbon Cycling and Utilizationmentioning

confidence: 99%

Ecological issues related to N deposition to natural ecosystems: research needs

Adams

2003

Environment International

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“…An increase in soil temperature could also directly stimulate methanotroph activity [Castro et al, 1995;Bowden et al, 1998]. Often, temporal variation in field measurements of CH 4 uptake correlates positively with temporal fluctuations in soil temperature [van den Pol-van Dasselaar et al, 1998;West et al, 1999;Phillips et al, 2001], but it is not always clear how much this correlation is caused by direct or indirect temperature effects.…”

Section: Introductionmentioning

confidence: 99%

Elevated CO₂and warming effects on CH₄uptake in a semiarid grassland below optimum soil moisture

Dijkstra

Morgan²,

Fischer

et al. 2011

J. Geophys. Res.

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[1] Semiarid rangelands are a significant global sink for methane (CH 4 ), but this sink strength may be altered by climate change. Methane uptake is sensitive to soil moisture showing a hump-shaped relationship with a distinct optimum soil moisture level. Both CO 2 and temperature affect soil moisture, but the direction of CH 4 uptake response may depend on if the system is below or above the soil moisture optimum. Most climate change studies on CH 4 uptake have been conducted in mesic environments with soil moisture levels typically above optimum, but little is known about responses in drier systems with suboptimal soil water. We studied effects of atmospheric CO 2 (ambient versus 600 ppm), and temperature (ambient versus 1.5/3.0°C warmer day/night) on CH 4 uptake during two growing seasons in a full factorial semiarid grassland field experiment in Wyoming, United States. We observed typical hump-shaped relationships between CH 4 uptake and water filled pore space. Averaged over a range of soil moisture conditions, CH 4 uptake was not affected by elevated CO 2 , but significantly decreased with warming in both seasons (25% in the first and 13% in the second season). Warming showed the strongest reduction and elevated CO 2 showed the strongest increase in CH 4 uptake when soils were below optimum moisture, indicating that these effects are particularly strong when soils are dry. Thus, directional effects of elevated CO 2 and warming on CH 4 uptake in semiarid grasslands can be opposite to their effects in mesic ecosystems because semiarid grasslands are often below optimum soil moisture for methane uptake.Citation: Dijkstra, F. A., J. A. Morgan, J. C. von Fischer, and R. F. Follett (2011), Elevated CO 2 and warming effects on CH 4 uptake in a semiarid grassland below optimum soil moisture,

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Landscape patterns of CH4 fluxes in an alpine tundra ecosystem

Cited by 32 publications

References 42 publications

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Ecological issues related to N deposition to natural ecosystems: research needs

Elevated CO₂and warming effects on CH₄uptake in a semiarid grassland below optimum soil moisture

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Landscape patterns of CH4 fluxes in an alpine tundra ecosystem

Cited by 32 publications

References 42 publications

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Ecological issues related to N deposition to natural ecosystems: research needs

Elevated CO2and warming effects on CH4uptake in a semiarid grassland below optimum soil moisture

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Elevated CO₂and warming effects on CH₄uptake in a semiarid grassland below optimum soil moisture