Substantial non-growing season carbon dioxide loss across Tibetan alpine permafrost region

One of the major uncertainties for projecting permafrost carbon (C)-climate feedback is a poor representation of the non-growing season carbon dioxide (CO2) emissions under a changing climate. Here, combining in situ field observations, regional synthesis and a random forest model, we assessed conte...

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Bibliographic Details
Published in:Global Change Biology
Main Authors: Li, Qinlu, Liu, Yang, Kou, Dan, Peng, Yunfeng, Yang, Yuanhe
Format: Article in Journal/Newspaper
Language:English
Published: WILEY 2022
Subjects:
alpine grasslands
CO2 flux
soil respiration
Tibetan Plateau
winter time
Biodiversity Conservation
Ecology
Environmental Sciences
GRASSLAND
RESPONSES
PATTERNS
NITROGEN
CO2
RESPIRATION
ECOSYSTEMS
EMISSIONS
BIOMASS
TUNDRA
Science Citation Index Expanded (SCI-EXPANDED)
Arctic
permafrost
Tundra
Online Access:http://ir.ibcas.ac.cn/handle/2S10CLM1/28628
https://doi.org/10.1111/gcb.16315
Description
Summary:One of the major uncertainties for projecting permafrost carbon (C)-climate feedback is a poor representation of the non-growing season carbon dioxide (CO2) emissions under a changing climate. Here, combining in situ field observations, regional synthesis and a random forest model, we assessed contemporary and future soil respired CO2 (i.e., soil respiration, R-s) across the Tibetan alpine permafrost region, which has received much less attention compared with the Arctic permafrost domain. We estimated the regional mean R-s of 229.8, 72.9 and 302.7 g C m(-2) year(-1) during growing season, non-growing season and the entire year, respectively; corresponding to the contemporary losses of 296.9, 94.3 and 391.2 Tg C year(-1) from this high-altitude permafrost-affected area. The non-growing season R-s accounted for a quarter of the annual soil CO2 efflux. Different from the prevailing view that temperature is the most limiting factor for cold-period CO2 release in Arctic permafrost ecosystems, precipitation determined the spatial pattern of non-growing season R-s on the Tibetan Plateau. Using the key predictors, model extrapolation demonstrated additional losses of 38.8 and 74.5 Tg C from the non-growing season for a moderate mitigation scenario and a business-as-usual emissions scenario, respectively. These results provide a baseline for non-growing season CO2 emissions from high-altitude permafrost areas and help for accurate projection of permafrost C-climate feedback.

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