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CH4 emissions under warming schemes from peatlands of different depths in the Zoige Plateau(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2016 01
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CH4 emissions under warming schemes from peatlands of different depths in the Zoige Plateau
LIU Liangfeng1 CHEN Huai2** PENG Changhui1 ZHU Qiuan1 & LI Baoxin3
1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Forestry, Northwest A&F University, Yangling 712100, China 2Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 3Department of Science and Technology, Qinghai Normal University, Xining 810008, China
peatlands methane incubation experiment warming DOC MBC
X171 (27)

With the warming of climate, much degradation has taken place in peatlands on Zoige Plateau. But its effect on the CH4 emission at soil of different depths remains unknown. In this study, soil of different depths from the Zoige Plateau was incubated at two temperatures (8 °C and 18 °C) to detect CH4 emission; the effects of dissolved organic carbon (DOC) and microbe biomass carbon (MBC) on CH4 emission were also determined. The results showed that enhanced temperature decreased CH4 emission from 4.94 ± 0.70 mg m-2 d-1 at 8 °C to 3.16 ± 0.69 mg m-2 d-1 at 18 °C. The peat at different depths showed different responses to warming. Probably due to the varying soil substrate quality among the whole profile, CH4 emission was increased at the surface but decreased at deeper layers. We also found that DOC had negative effect on CH4 emission at 8 °C but no effect at 18 °C, which should be correlated to the origin of DOC. MBC had a negative effect on CH4 emission. Based on the results, we can conclude that CH4 emission may decrease with the warming of Zoige Plateau peatlands.


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