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, Junfeng; Wu, Qingbai; Yuan, Ziqiang; Kang, Hojeong
发表日期	2020
ISSN	1994-0416
EISSN	1994-0424
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 (R-s) in permafrost regions. However, little is known about how the freeze-thaw processes affect the R-s dynamics in different stages of the alpine meadow underlain by permafrost in the Qinghai-Tibet Plateau (QTP). We conducted continuous in situ measurements of R-s 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 mu molm(-2) s(-1) 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 (4.91 +/- 0.35) in WC and minimum (0.33 +/- 0.21) in AF. Patterns of R-s among the ST, AF, WC, and SW stages differed, and the corresponding contribution percentages of cumulative R-s to total Rs of a complete freeze-thaw cycle (1692.98 +/- 51.43 gCO(2) m(-2)) were 61.32 +/- 0.32 %, 8.89 +/- 0.18 %, 18.43 +/- 0.11 %, and 11.29 +/- 0.11 %, respectively. Soil temperature (T-s) 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 R-s emissions from this ecosystem because of a prolonged ST stage.
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS关键词	ORGANIC-CARBON ; ECOSYSTEM RESPIRATION ; CLIMATE-CHANGE ; WATER-CONTENT ; CO2 EXCHANGE ; COLD SEASON ; TEMPERATURE ; TUNDRA ; AVAILABILITY ; DYNAMICS
WOS记录号	WOS:000569332300001
来源期刊	CRYOSPHERE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/240241
作者单位	[Wang, Junfeng; Wu, Qingbai; Yuan, Ziqiang] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Wang, Junfeng] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Beiluhe Observat Stn Frozen Soil Environm & Engn, Lanzhou 730000, Peoples R China; [Kang, Hojeong] Yonsei Univ, Sch Civil & Environm Engn, Seoul 03722, South Korea
推荐引用方式 GB/T 7714	Wang, Junfeng,Wu, Qingbai,Yuan, Ziqiang,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]. 中国科学院西北生态环境资源研究院,2020,14(9).
APA	Wang, Junfeng,Wu, Qingbai,Yuan, Ziqiang,&Kang, Hojeong.(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, Junfeng,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).