期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 52, 期 3, 页码 1244-1252出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b04979
关键词
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资金
- National Basic Research Program of China on Global Change [2014CB954001]
- National Natural Science Foundation of China [31670482]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SMC049]
- Chinese Academy of Sciences-Peking University Pioneer Cooperation Team
- Thousand Young Talents Program
Permafrost thaw alters the physical and environmental conditions of soil and may thus cause a positive feedback to climate warming through increased methane emissions. However, the current knowledge of methane emissions following thermokarst development is primarily based on expanding lakes and wetlands, with upland thermokarst being studied less often. In this study, we monitored the methane emissions during the peak growing seasons of two consecutive years along a thaw sequence within a thermo-erosion gully in a Tibetan swamp meadow. Both years had consistent results, with the early and midthaw stages (3 to 12 years since thaw) exhibiting low methane emissions that were similar to those in the undisturbed meadow, while the emissions from the late thaw stage (20 years since thaw) were 3.5 times higher. Our results also showed that the soil water filled pore space, rather than the soil moisture per se, in combination with the sand content, were the main factors that caused increased methane emissions. These findings differ from the traditional view that upland thermokarst could reduce methane emissions owing to the improvement of drainage conditions, suggesting that upland thermokarst development does not always result in a decrease in methane emissions.
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