[1]HAN Shixing,CHEN Yunteng,ZHANG Yiqing,et al.Dual Effects of Warming and Drought on Peat Methane Emissions in Zoige[J].Research of Soil and Water Conservation,2022,29(05):391-397,410.
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Dual Effects of Warming and Drought on Peat Methane Emissions in Zoige
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 05
Page number:
391-397,410
Column:
Public date:
2022-08-20
- Title:
- Dual Effects of Warming and Drought on Peat Methane Emissions in Zoige
- CLC:
- S153.6; X171.1
- DOI:
- -
- Abstract:
- Most of peatland in Zoige region has experienced long term artificial drainage, and will probably face strongly warming and drought climate in the future. These multiple artificial and natural changes may have a complex effect on peat CH4 emissions. In this study, two typical types of peatlands, near-natural and long-term artificial drained peatlands, were selected in Zoige region. One-meter-deep peat columns were collected from these sites and incubated under indoor environmental conditions. Different oxygen, moisture and temperature conditions were set up to explore the different responses of peat CH4 emissions to dual effects of warming and drought in these two typical peatlands. The results showed that:(1)accumulated CH4 emissions of middle and lower layers of peat(20—80 cm)in the drained peatland were significantly lower than those in the near-natural peatland due to the decrease of water table and organic matter quality in the drained peatland;(2)CH4 emissions of the surface and deep layers of peat in these two types of peatlands were not sensitive to the temperature increase, whereas accumulated CH4 emissions of the middle and lower layers of peat(20—80 cm)increased significantly from 5℃-incubation to 15℃-incubation;(3)under the simulated 10℃ warming and 20 cm water table decline, middle layer of peat was received triple effects from changes in temperature, water and oxygen, and its CH4 emissions were changed dramatically;(4)the total CH4 emission of one-meter-deep peat in near-natural peatland was(204.29±15.13)μg/gC at high temperature and low water level conditions, which was 66.43 μg/gC(about 48%)higher than the emission in original low temperature and high water level conditions; meanwhile, the total CH4 emission of one-meter-deep peat in long-term drained peatland was(75.64±9.41)μg/gC at high temperature and low water level conditions, which was 11.95 μg/gC(about 19%)higher than the emission in original low temperature and high water level conditions. Therefore, the warming and drought climate induced by anthropogenic activities would display a destructive impact on the stability of organic carbon in Zoige peatland, which could cause the dramatic change of CH4 emission in middle layer of peat, and will eventually lead to a significant increase of CH4 emission in this region in future.
- References:
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Last Update:
2022-08-20