High methane emissions from a littoral zone on the Qinghai-Tibetan Plateau

Chen, Huai; Wu, Ning; Yao, Shouping; Gao, Yongheng; Zhu, Dan; Wang, Yanfen; Xiong, Wan; Yuan, Xingzhong

doi:10.1016/j.atmosenv.2009.07.001

Cited by 45 publications

(39 citation statements)

References 23 publications

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“…This was mainly due to that the drying periods in our site were characterized by no standing water and relatively low soil moisture. In addition, our N 2 O flux rate was much lower than those of Tibetan Huahu Lake and subtropical Taihu Lake, likely because of lake trophic differences (Wang et al 2006a;Chen et al 2009). …”

Section: Ch 4 and N 2 O Emissions During Drawdown Periodsmentioning

confidence: 93%

“…The littoral zones of lakes have been regarded as hotspots of CH 4 and N 2 O emissions (Juutinen et al 2003a;Wang et al 2006aWang et al , 2006bChen et al 2009). For instance, in the boreal Lake Kevätön in Finland, the littoral zone occupied 26 % of the lake area but was estimated to account for most of the N 2 O emissions from the lake (Huttunen et al 2003).…”

Section: Ch 4 and N 2 O Emissions During Drawdown Periodsmentioning

confidence: 99%

“…Studies have demonstrated that littoral wetlands were 'hot spots' for CH 4 and N 2 O emissions (Juutinen et al 2003a;Wang et al 2006aWang et al , 2006bChen et al 2009). However, most of these studies were concentrated in boreal or cold regions Juutinen et al 2003aJuutinen et al , 2003bChen et al 2009Chen et al , 2011. Although lake areas in low latitudes are much smaller than in high latitudes, the estimated sediment GHG productions from low latitude lakes were substantially higher than boreal lakes (Marotta et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Cai

Yao

et al. 2015

Plant Soil

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Aims Plants have been suggested to have significant effects on methane (CH 4 ) and nitrous oxide (N 2 O) fluxes from littoral wetlands, but it remains unclear in subtropical lakes. Methods We conducted in situ measurement of CH 4 and N 2 O fluxes for two years. To distinguish between the effects of shoots and roots, three treatments (i.e., intact plants as control, shoot clipping, and root exclusion) were used. Effects of plant biomass, temperature, and soil moisture on CH 4 and N 2 O fluxes were analyzed. Results The mean ecosystem CH 4 emission rate was 36 μg CH 4 m −2 h −1 for drying periods, but 8219 μg CH 4 m −2 h −1 for drying-wetting transition periods. CH 4 fluxes were positively correlated with below-ground and total biomass, but not with above-ground biomass. Clipping did not significantly alter CH 4 flux rate, but root exclusion decreased the CH 4 flux by 116 % as compared to the control. N 2 O emissions were similar for both the drying and drying-wetting transition periods, with a mean rate of 20 μg N 2 O m −2 h −1 . Both clipping and root exclusion significantly increased N 2 O fluxes as compared to the control. Conclusions There was no significant correlation between CH 4 and N 2 O fluxes. Roots dominated plantmediated enhancement in CH 4 fluxes, but played almost an equal role as shoots in plant-regulated suppression on N 2 O fluxes in this Carex meadow during drawdown periods.

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Section: Ch 4 and N 2 O Emissions During Drawdown Periodsmentioning

confidence: 93%

Section: Ch 4 and N 2 O Emissions During Drawdown Periodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Cai

Yao

et al. 2015

Plant Soil

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“…The submerged plants fringe the open water area of Lake Medo, occupying approximately 30% of the bottom; the rest of the bottom is soft sediment. The littoral zone covers 12% of the area of Lake Medo (Chen et al, 2009). Hippuris vulgaris, Carex muliensis, Glyceria maxima are dominant plants in the steep littoral zone, while Kobresia tibetica and Polygonum amphibium are dominant plants in the smooth littoral zone (Fig.…”

Section: Lake Descriptionmentioning

confidence: 99%

“…Previous studies focused on methane fluxes from lakes are limited to the low-altitude regions (Bastviken et al, 2004(Bastviken et al, , 2008Engle and Melack, 2000;Walter et al, 2008), except for diffusive fluxes reported from lakes on the Colorado Rockies (Smith and Lewis, 1992) and littoral zone on the Tibetan Plateau (Chen et al 2009). The Tibetan Plateau, which is called the "Third Pole" of the earth, encompasses a huge area of 2.5 × 10 6 km 2 with approximately 50,000 km 2 lake area.…”

Section: Introductionmentioning

confidence: 99%

Intense methane ebullition from open water area of a shallow peatland lake on the eastern Tibetan Plateau

Zhu

Chen

et al. 2016

Science of The Total Environment

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Spatial variations of methane emission in a large shallow eutrophic lake in subtropical climate

Xiao

Zhang

et al. 2017

J. Geophys. Res. Biogeosci.

122

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Subtropical lakes are important source of atmospheric methane (CH4). This study aims to investigate spatial variations of CH4 flux in Lake Taihu, a large (area 2400 km2) and shallow (mean depth 1.9 m) eutrophic lake in Eastern China. The lake exhibited high spatial variations in pollution level, macrophyte vegetation abundance, and algal growth. We measured the diffusion CH4 flux via the transfer coefficient method across the whole lake. In addition, data obtained with the flux gradient and the eddy covariance methods were used in conjunction with the data on the diffusion flux to estimate the contribution by ebullition. Results from 3 years' measurements indicated high spatial variabilities in the diffusion CH4 flux. The spatial pattern of the diffusion CH4 emission was correlated with water clarity, dissolved oxygen concentration, and the spatial distributions of algal and submerged vegetation. In comparison to the transfer coefficient method, the eddy covariance and the flux gradient method observed a lake CH4 flux that was 3.39 ± 0.58 (mean ± 1 standard deviation) and 1.95 ± 0.36 times higher in an open‐water eutrophic zone and in a habitat of submerged macrophytes, respectively. The result implied an average of 71% and 49% ebullition contribution to the total CH4 flux in the two zones. The annual mean diffusion CH4 flux of the whole lake was 0.54 ± 0.30 g m−2 yr−1. Our CH4 emission data suggest that the average CH4 emission reported previously for lakes in Eastern China was overestimated.

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High methane emissions from a littoral zone on the Qinghai-Tibetan Plateau

Cited by 45 publications

References 23 publications

Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Intense methane ebullition from open water area of a shallow peatland lake on the eastern Tibetan Plateau

Spatial variations of methane emission in a large shallow eutrophic lake in subtropical climate

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