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Resilience of Energy and CO2 Exchange to a Summer Heatwave in an Alpine Humid Grassland on the Qinghai-Tibetan Plateau
Zhang, Fawei1,2; Cao, Guangmin1
2017
Source PublicationPOLISH JOURNAL OF ENVIRONMENTAL STUDIES
Volume26Issue:1Pages:385-394
SubtypeArticle
AbstractSummer heatwaves are expected to be much more frequent and severe with negative effects on terrestrial ecosystem water and carbon budgets, while the impacts on alpine grasslands remain poorly understood. Here we analyzed eddy flux and meteorological dataset of a seven-day (July 26 to August 1) summer heatwave in an alpine humid grassland in northeastern Qinghai-Tibetan Plateau in 2015. Compared with pre-heatwave, only diurnal ecosystem respiration (RES) increased by 30.7%, evidently (P < 0.001) during the heatwave. Diurnal sensible heat fluxes (H) and latent heat fluxes (LET) increased by 18.1% (P = 0.08) and 27.5% (P = 0.02) from 9:00 to 16:00. The heatwave did not lead to substantial increments of daily H and daily LET, while daily Bowen ratio (H/LET) decreased a little (P = 0.07). Daily net ecosystem CO2 exchange increased by 76.7% (P = 0.03), mainly resulting from remarkable growth in daily RES (P<0.001) and undetectable fluctuation in daily gross primary production (GPP) (P = 0.13). Daily ecosystem water use efficiency (GPP/evapotranspiration) decreased by 20.8%. The little difference of energy and CO2 fluxes between pre-heatwave and post-heatwave indicated strong resilience to the summer heatwave in the alpine humid grassland. Our results revealed that the present-day summer heatwave exerted a limited influence on energy exchange and vegetation photosynthetic activity but did stimulate ecosystem respiration, which would provide a positive feedback to climate warming with more carbon efflux from alpine grassland.
KeywordClimate Change Vegetation Photosynthesis Ecosystem Respiration Evapotranspiration Boosted Regression Trees
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.15244/pjoes/64912
WOS KeywordCLIMATE EXTREMES ; MOUNTAIN GRASSLANDS ; CARBON-CYCLE ; ECOSYSTEM ; PRODUCTIVITY ; CHINA ; TEMPERATURE ; VARIABILITY ; REDUCTION ; IMPACTS
Indexed BySCI
Language英语
Funding OrganizationScience and Technology Service Network Initiative of the Chinese Academy of Sciences(KFJ-EW-STS-125) ; National Natural Science Foundation of China(31270520 ; 31300385 ; 31270523)
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000394830000041
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/6831
Collection中国科学院西北高原生物研究所
Affiliation1.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Fawei,Cao, Guangmin. Resilience of Energy and CO2 Exchange to a Summer Heatwave in an Alpine Humid Grassland on the Qinghai-Tibetan Plateau[J]. POLISH JOURNAL OF ENVIRONMENTAL STUDIES,2017,26(1):385-394.
APA Zhang, Fawei,&Cao, Guangmin.(2017).Resilience of Energy and CO2 Exchange to a Summer Heatwave in an Alpine Humid Grassland on the Qinghai-Tibetan Plateau.POLISH JOURNAL OF ENVIRONMENTAL STUDIES,26(1),385-394.
MLA Zhang, Fawei,et al."Resilience of Energy and CO2 Exchange to a Summer Heatwave in an Alpine Humid Grassland on the Qinghai-Tibetan Plateau".POLISH JOURNAL OF ENVIRONMENTAL STUDIES 26.1(2017):385-394.
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