Resilience of Energy and CO2 Exchange to a Summer Heatwave in an Alpine Humid Grassland on the Qinghai-Tibetan Plateau

doi:10.15244/pjoes/64912

NWIPB OpenIR

	Resilience of Energy and CO2 Exchange to a Summer Heatwave in an Alpine Humid Grassland on the Qinghai-Tibetan Plateau
	Zhang, Fawei 1,2; Cao, Guangmin 1
	2017
发表期刊	POLISH JOURNAL OF ENVIRONMENTAL STUDIES
卷号	26 期号:1 页码:385-394
文章类型	Article
摘要	Summer 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.
关键词	Climate Change Vegetation Photosynthesis Ecosystem Respiration Evapotranspiration Boosted Regression Trees
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
DOI	10.15244/pjoes/64912
关键词[WOS]	CLIMATE EXTREMES ; MOUNTAIN GRASSLANDS ; CARBON-CYCLE ; ECOSYSTEM ; PRODUCTIVITY ; CHINA ; TEMPERATURE ; VARIABILITY ; REDUCTION ; IMPACTS
收录类别	SCI
语种	英语
项目资助者	Science 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研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000394830000041
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/6831
专题	中国科学院西北高原生物研究所
作者单位	1.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
推荐引用方式 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.