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Altered albedo dominates the radiative forcing changes in a subtropical forest following an extreme snow event
Gnanamoorthy, Palingamoorthy; Song, Qinghai1; Zhao, Junbin2; Zhang, Yiping1; Liu, Yuntong1; Zhou, Wenjun1; Sha, Liqing1; Fan, Zexin1,3; Burman, Pramit Kumar Deb4,5
2021
Source PublicationGLOBAL CHANGE BIOLOGY
ISSN1354-1013
Volume27Issue:23Pages:6192-6205
Abstract

Subtropical forests are important ecosystems globally due to their extensive role in carbon sequestration. Extreme climate events are known to introduce disturbances in the ecosystem that cause long-term changes in carbon balance and radiation reflectance. However, how these ecosystem function changes contribute to global warming in terms of radiative forcing (RF), especially in the years following a disturbance, still needs to be investigated. We studied an extreme snow event that occurred in a subtropical evergreen broadleaved forest in south-western China in 2015 and used 9 years (2011-2019) of net ecosystem CO2 exchange (NEE) and surface albedo (alpha) data to investigate the effect of the event on the ecosystem RF changes. In the year of the disturbance, leaf area index (LAI) declined by 40% and alpha by 32%. The annual NEE was -718 +/- 128 g C m(-2) as a sink in the pre-disturbance years (2011-2014), but after the event, the sink strength dropped significantly by 76% (2015). Both the vegetation, indicated by LAI, and alpha recovered to pre-disturbance levels in the fourth post-disturbance year (2018). However, the NEE recovery lagged and occurred a year later in 2019, suggesting a more severe and lasting impact on the ecosystem carbon balance. Overall, the extreme event caused a positive (warming effect) net RF which was predominantly caused by changes in alpha (90%-93%) rather than those in NEE. This result suggests that, compared to the climate effect caused by forest carbon sequestration changes, the climate effect of alpha alterations can be more sensitive to vegetation damage induced by natural disturbances. Moreover, this study demonstrates the important role of vegetation recovery in driving canopy reflectance and ecosystem carbon balance during the post-disturbance period, which determines the ecosystem feedbacks to the climate change.

Keywordclimate feedback net ecosystem CO2 exchange radiative forcing snow disturbance subtropical forest surface albedo vegetation recovery
Subject AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
DOI10.1111/gcb.15885
Indexed BySCI
Language英语
WOS IDWOS:000698901300001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/12395
Collection全球变化研究组
Affiliation1.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Menglun 666303, Peoples R China
2.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Xishuangbanna, Peoples R China
3.Norwegian Inst Bioecon Res, Dept Biogeochem & Soil Qual, Div Environm & Nat Resources, As, Norway
4.Natl Field Sci Observat & Res Stn Forest Ecosyst, Jingdong, Yunnan, Peoples R China
5.Minist Earth Sci, Indian Inst Trop Meteorol, Pune, Maharashtra, India
6.Savitribai Phule Pune Univ, Dept Atmospher & Space Sci, Pune, Maharashtra, India
Recommended Citation
GB/T 7714
Gnanamoorthy, Palingamoorthy,Song, Qinghai,Zhao, Junbin,et al. Altered albedo dominates the radiative forcing changes in a subtropical forest following an extreme snow event[J]. GLOBAL CHANGE BIOLOGY,2021,27(23):6192-6205.
APA Gnanamoorthy, Palingamoorthy.,Song, Qinghai.,Zhao, Junbin.,Zhang, Yiping.,Liu, Yuntong.,...&Burman, Pramit Kumar Deb.(2021).Altered albedo dominates the radiative forcing changes in a subtropical forest following an extreme snow event.GLOBAL CHANGE BIOLOGY,27(23),6192-6205.
MLA Gnanamoorthy, Palingamoorthy,et al."Altered albedo dominates the radiative forcing changes in a subtropical forest following an extreme snow event".GLOBAL CHANGE BIOLOGY 27.23(2021):6192-6205.
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