DOI: 10.5194/tc-14-2835-2020
论文题名: Soil respiration of alpine meadow is controlled by freeze-Thaw processes of active layer in the permafrost region of the Qinghai-Tibet Plateau
作者: Wang J. ; Wu Q. ; Yuan Z. ; Kang H.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 9 起始页码: 2835
结束页码: 2848
语种: 英语
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164618
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
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]. Cryosphere,2020-01-01,14(9)