Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland

Hirota, Minoru; Tang, Yanhong; Hu, Qiwu; Hirata, Shigeki; Kato, Tomomichi; Mo, Wenhong; Cao, Guangmin; Mariko, Shigeru

doi:10.1016/j.soilbio.2003.12.009

Cited by 159 publications

(117 citation statements)

References 42 publications

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“…Time (GMT+8) et al 1999; Wickland et al 1999Wickland et al , 2001Hirota et al 2004;Hu et al 2005). This was attributable to the fact that the soil of alpine wetlands on Qinghai-Tibetan plateau is extremely rich in organic matters (Wang et al 2002).…”

Section: Temperature( C)mentioning

confidence: 99%

“…Therefore, studies are abundant in CH 4 efflux and its diurnal variation patterns from wetlands all over the world (Van Der Nat et al 1998;Tomoko et al 2000;Chimner and Cooper 2003;Ström et al 2003;Ding et al 2004;Duan et al 2005;Wang and Han 2005). However, there is comparatively little knowledge about CH 4 emission efflux, even less about its diurnal variation patterns, from alpine wetlands (Jin et al 1999;Wickland et al 1999;Wickland et al 2001;Chimner and Cooper 2003;Hirota et al 2004). Jin et al (1999) reported that Zoige alpine wetlands were one of major methane emission centers of Qinghai-Tibetan Plateau.…”

Section: Introductionmentioning

confidence: 99%

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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: Temperature( C)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Table 1 shows the main input and parameter values at the study sites. [29] f root (dimensionless)ˆP roportion of below-ground to the total production 0.5 0.5 [33] P ox (dimensionless)ˆT he fraction of CH 4 oxidized during plant mediated transport 0.5 0.5 [29] T veg (dimensionless)ˆT he fraction of plant mediated transport was available 1 1 [29] ANPP (g m´2 year´1) * Aboveground net primary productivity 340 a , 290 b 380 c , 397 d [34,35] In order to obtain the ANPP on a regional scale, we used the outputs of the TEM model. TEM is a process-based ecosystem model that simulates the biogeochemical cycles of C and N between terrestrial ecosystems and the atmosphere [38,39].…”

Section: Model Frameworkmentioning

confidence: 99%

“…Synchronous measurements of the climate and water table depth, as well as the plant biomass, were also taken during the experiment. More details about these measurements can be found in previously published work [35].…”

Section: Data Sourcesmentioning

confidence: 99%

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Modeling CH4 Emissions from Natural Wetlands on the Tibetan Plateau over the Past 60 Years: Influence of Climate Change and Wetland Loss

Zhang

Zou

et al. 2016

Atmosphere

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Abstract:The natural wetlands of the Tibetan Plateau (TP) are considered to be an important natural source of methane (CH 4 ) to the atmosphere. The long-term variation in CH 4 associated with climate change and wetland loss is still largely unknown. From 1950 to 2010, CH 4 emissions over the TP were analyzed using a model framework that integrates CH4MOD wetland , TOPMODEL, and TEM models. Our simulation revealed a total increase of 15% in CH 4 fluxes, from 6.1 g m´2 year´1 to 7.0 g m´2 year´1. This change was primarily induced by increases in temperature and precipitation. Although climate change has accelerated CH 4 fluxes, the total amount of regional CH 4 emissions decreased by approximately 20% (0.06 Tg-i.e., from 0.28 Tg in the 1950s to 0.22 Tg in the 2000s), due to the loss of 1.41 million ha of wetland. Spatially, both CH 4 fluxes and regional CH 4 emissions showed a decreasing trend from the southeast to the northwest of the study area. Lower CH 4 emissions occurred in the northwestern Plateau, while the highest emissions occurred in the eastern edge. Overall, our results highlighted the fact that wetland loss decreased the CH 4 emissions by approximately 20%, even though climate change has accelerated the overall CH 4 emission rates over the last six decades.

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Revisiting the role of CH₄ emissions from alpine wetlands on the Tibetan Plateau: Evidence from two in situ measurements at 4758 and 4320 m above sea level

et al. 2015

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The alpine wetlands on the Tibetan Plateau (TP) constitute 30% of China's wetlands, and previous studies have considered these wetlands to be important sources of CH 4 , based on several swamp measurements from the eastern edges of the plateau. However, the alpine wetlands consist of both swamps (9.5%) and swamp meadows (79.8%). In this study, the CH 4 fluxes of a swamp meadow and a swamp were determined. The results showed that the swamp meadow emitted much less CH 4 (130.8 ± 123.9 μg). The CH 4 fluxes within the swamp meadow showed distinct microscale spatial heterogeneity: the hollow terrain released CH 4 , while the hummocks absorbed CH 4 ; this pattern was explained well by soil moisture. The CH 4 emissions in the swamp meadow were highly sensitive to soil temperature variation (Q 10 = 3.62), while they were more sensitive to soil moisture in the swamp. By summarizing existing measurements, and considering the differences in CH 4 emissions from swamp meadows and swamps, the emissions of CH 4 from alpine wetlands across the TP were recalculated to range from 0.215 to 0.412 Tg CH 4 a À1 , lower than previous studies. By comparison, the CH 4 uptake by nonwetland ecosystems ranges from À0.68 to À0.53 Tg CH 4 a À1. Therefore, this study conveys a notion that the alpine wetlands on the TP may not be significant CH 4 sources. However, further studies are needed to reduce the uncertainty regarding CH 4 emissions.

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Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland

Cited by 159 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

Modeling CH4 Emissions from Natural Wetlands on the Tibetan Plateau over the Past 60 Years: Influence of Climate Change and Wetland Loss

Revisiting the role of CH₄ emissions from alpine wetlands on the Tibetan Plateau: Evidence from two in situ measurements at 4758 and 4320 m above sea level

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Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland

Cited by 159 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

Modeling CH4 Emissions from Natural Wetlands on the Tibetan Plateau over the Past 60 Years: Influence of Climate Change and Wetland Loss

Revisiting the role of CH4 emissions from alpine wetlands on the Tibetan Plateau: Evidence from two in situ measurements at 4758 and 4320 m above sea level

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Revisiting the role of CH₄ emissions from alpine wetlands on the Tibetan Plateau: Evidence from two in situ measurements at 4758 and 4320 m above sea level