气候变化领域集成服务门户(CCPortal): Soil respiration of alpine meadow is controlled by freeze-Thaw processes of active layer in the permafrost region of the Qinghai-Tibet Plateau

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DOI	10.5194/tc-14-2835-2020
	Soil respiration of alpine meadow is controlled by freeze-Thaw processes of active layer in the permafrost region of the Qinghai-Tibet Plateau
	Wang J.; Wu Q.; Yuan Z.; Kang H.
发表日期	2020
ISSN	19940416
起始页码	2835
结束页码	2848
卷号	14 期号:9
英文摘要	Freezing and thawing action of the active layer plays a significant role in soil respiration (Rs) in permafrost regions. However, little is known about how the freeze thaw processes affect the Rs dynamics in different stages of the alpine meadow underlain by permafrost in the Qinghai Tibet Plateau (QTP). We conducted continuous in situ measurements of Rs and freeze thaw processes of the active layer at an alpine meadow site in the Beiluhe permafrost region of the QTP and divided the freeze thaw processes into four different stages in a complete freeze thaw cycle, comprising the summer thawing (ST) stage, autumn freezing (AF) stage, winter cooling (WC) stage, and spring warming (SW) stage. We found that the freeze thaw processes have various effects on the Rs dynamics in different freeze thaw stages. The mean Rs ranged from 0.12 to 3.18 ?molm2 s1 across the stages, with the lowest value in WC and highest value in ST. Q10 among the different freeze thaw stages changed greatly, with the maximum (4:910:35) in WC and minimum (0:330:21) in AF. Patterns of Rs among the ST, AF, WC, and SW stages differed, and the corresponding contribution percentages of cumulative Rs to total Rs of a complete freeze thaw cycle (1692:9851:43 gCO2 m2) were 61:320:32 %, 8:890:18 %, 18:430:11 %, and 11:290:11 %, respectively. Soil temperature (Ts) was the most important driver of Rs regardless of soil water status in all stages. Our results suggest that as climate change and permafrost degradation continue, great changes in freeze thaw process patterns may trigger more Rs emissions from this ecosystem because of a prolonged ST stage. © 2020 EDP Sciences. All rights reserved.
英文关键词	active layer; alpine environment; climate change; cooling; freeze-thaw cycle; meadow; permafrost; soil degradation; soil respiration; soil temperature; soil water; Qinghai-Xizang Plateau
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202240
作者单位	State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Cas, Lanzhou, 730000, China; Beiluhe Observation Station of Frozen Soil Environment and Engineering, Northwest Institute of Eco-environment and Resources, Cas, Lanzhou, 730000, China; School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, South Korea
推荐引用方式 GB/T 7714	Wang J.,Wu Q.,Yuan Z.,et al. Soil respiration of alpine meadow is controlled by freeze-Thaw processes of active layer in the permafrost region of the Qinghai-Tibet Plateau[J],2020,14(9).
APA	Wang J.,Wu Q.,Yuan Z.,&Kang H..(2020).Soil respiration of alpine meadow is controlled by freeze-Thaw processes of active layer in the permafrost region of the Qinghai-Tibet Plateau.Cryosphere,14(9).
MLA	Wang J.,et al."Soil respiration of alpine meadow is controlled by freeze-Thaw processes of active layer in the permafrost region of the Qinghai-Tibet Plateau".Cryosphere 14.9(2020).