气候变化领域集成服务门户(CCPortal): Research advances in the influence of seasonal freeze-thaw on carbon emissions from peatlands

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DOI	10.19675/j.cnki.1006-687x.2019.10038
	Research advances in the influence of seasonal freeze-thaw on carbon emissions from peatlands
	Yang Z.; Zhu D.; Chen H.; Liu J.; He Y.; Liu X.
发表日期	2020
ISSN	1006687X
起始页码	1290
结束页码	1298
卷号	26 期号:5
英文摘要	As a significant terrestrial carbon pool that is extremely sensitive to climate change, peatlands, with their potential for carbon emission, play an important role in Earth's climatic system. Seasonal freeze-thaw, as a critical surface process, constitutes the most concentrated and strongest influence on the carbon pool of peatlands. Many data sets from outdoor field monitors, as well as indoor incubation research, show that the emission peak from the carbon pool happens during the freeze-thaw period. First, the dramatic variations of both hydrological and thermal factors during this period are thought to be responsible for the variations in carbon emissions. The degree of correlation is affected by the length of the freeze-thaw cycles, as well as the frequency and intensity of the daily freeze-thaw cycles. During freezing and thawing, the soil water moves to the phase interface. This movement, along with an increase in the thermal conductivity of the peat, results in a change of heat flux. Second, the seasonal freeze-thaw cycle changes the microbial activity, community structure, and some microbial quantity, and then affects the carbon emission of the microbial population. In the end, the seasonal freeze-thaw cycle destroys the soil structure, affects the stability of soil aggregates, and then affects the release of organic carbon (OC) from aggregates. Freeze-thaw cycles increase dissolved organic carbon (DOC) content, reduce microbial biomass carbon (MBC) content, and significantly affect active organic carbon content. Therefore, freeze-thaw cycles affect peat carbon emissions. Many mechanism studies explain some of the field monitoring results, but there are limitations, such as inconsistent test conditions and insufficient research under different freeze-thaw modes. The researchers have tended to pay attention to the phenomenon but ignore the mechanism. In addition, because of the key role of high-altitude peatlands in regional carbon balance and the special seasonal freeze-thaw process under such conditions, the influence of seasonal freezethaw cycles on carbon emissions of high-altitude peatlands requires further study. © 2020 Science Press. All rights reserved.
英文关键词	Carbon dioxide; Carbon emission; Methane; Peatlands; Qinghai-Tibet Plateau; Seasonal freeze-thaw
来源期刊	Chinese Journal of Applied and Environmental Biology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177007
作者单位	Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Yang Z.,Zhu D.,Chen H.,et al. Research advances in the influence of seasonal freeze-thaw on carbon emissions from peatlands[J],2020,26(5).
APA	Yang Z.,Zhu D.,Chen H.,Liu J.,He Y.,&Liu X..(2020).Research advances in the influence of seasonal freeze-thaw on carbon emissions from peatlands.Chinese Journal of Applied and Environmental Biology,26(5).
MLA	Yang Z.,et al."Research advances in the influence of seasonal freeze-thaw on carbon emissions from peatlands".Chinese Journal of Applied and Environmental Biology 26.5(2020).