气候变化领域集成服务门户(CCPortal): Cooling and wetting of soil decelerated ground freezing-thawing processes of the active layer in Xing'an permafrost regions in Northeast China

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DOI	10.1016/j.accre.2023.01.002
	Cooling and wetting of soil decelerated ground freezing-thawing processes of the active layer in Xing'an permafrost regions in Northeast China
	Lu, Bo-Quan; Zang, Shu-Ying; Song, Li-Quan; Sun, Li; LI, Miao; Bing, Di
发表日期	2023
ISSN	1674-9278
起始页码	126
结束页码	135
卷号	14 期号:1 页码:10
英文摘要	The accelerated or decelerated freezing-thawing processes of the active layer in Xing'an permafrost regions are crucial for the protection of permafrost. To better understand the freezing-thawing processes of the active layer and its driving factors, according to the observation from 2017 to 2020 of soil temperature and water content in the active layer of forest and peatland in two representative hemiboreal ecosystems in the Da Xing'anling Mountains, Northeast China, the study explored in detail the effects of climatic conditions and local factors on the hydrothermal and freezing-thawing processes of active layer soils. The results showed that during the freezing-thawing cycles of 2017-2020, freezing and thawing start times in the peatland and forest ecosystems soils were generally delayed, and it took longer for the active layer soil to completely thaw than to freeze. The annual average soil temperature in the peatland's active layer (5-80 cm) was 0.7-2.0 degrees C lower than that in the forest, and the annual average soil moisture content on the peatland was 5.5%-26.7% higher than that in the forest. Compared with the forest ecosystem soils, the ground surface freezing time of the peatland was delayed by 3-10 d, and the freezing rate decreased by 1.1-1.5 cm d-1, while the beginning time of thawing was advanced by 22-27 d, and the thawing rate decreased by 1.3-1.4 cm d-1. In the process of decreasing soil temperature and increasing soil moisture content, the freezing and thawing rate of the active layer would be reduced, decelerating the freezing-thawing processes of the active layer in the process of decreasing soil temperature and increasing soil moisture content. The results provide the key original data for studying the formation and evolution of active layer and permafrost in the Xing'an permafrost regions in Northeast China and can be used to validate the prediction of ecosystem succession under the combined influences of climate change and permafrost degradation.
英文关键词	Freezing-thawing processes; Hydrothermal dynamics; Active layer; Hemiboreal ecosystems; Xing'an permafrost
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000955053500001
来源期刊	ADVANCES IN CLIMATE CHANGE RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273989
作者单位	Harbin Normal University
推荐引用方式 GB/T 7714	Lu, Bo-Quan,Zang, Shu-Ying,Song, Li-Quan,et al. Cooling and wetting of soil decelerated ground freezing-thawing processes of the active layer in Xing'an permafrost regions in Northeast China[J],2023,14(1):10.
APA	Lu, Bo-Quan,Zang, Shu-Ying,Song, Li-Quan,Sun, Li,LI, Miao,&Bing, Di.(2023).Cooling and wetting of soil decelerated ground freezing-thawing processes of the active layer in Xing'an permafrost regions in Northeast China.ADVANCES IN CLIMATE CHANGE RESEARCH,14(1),10.
MLA	Lu, Bo-Quan,et al."Cooling and wetting of soil decelerated ground freezing-thawing processes of the active layer in Xing'an permafrost regions in Northeast China".ADVANCES IN CLIMATE CHANGE RESEARCH 14.1(2023):10.