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The strongest EI Nino event stimulated ecosystem respiration, not evapotranspiration, over a humid alpine meadow on the Qinghai-Tibetan Plateau

文献类型：期刊论文

作者Li, Hongqin1,2; Zhang, Fawei1,2,3; Wang, Wenying4; Li, Yikang2; Lin, Li2; Wang, Junbang5; Guo, Xiaowei2; Cao, Guangmin2; Yang, Yongsheng2; Li, Yingnian2
刊名ECOLOGICAL INDICATORS
出版日期2018-08-01
卷号91页码:562-569
关键词Gross primary production Ecosystem respiration Evapotranspiration Eddy covariance technique Extreme events Alpine meadow
ISSN号1470-160X
DOI10.1016/j.ecolind.2018.04.039
通讯作者Zhang, Fawei(mywing963@126.com) ; Cao, Guangmin(caogm@nwipb.cas.cn)
英文摘要Frequent EI Nino events have worldwide impacts, but their effects on carbon and water budgets in alpine grasslands have been poorly explored. The responses of carbon and water vapor exchanges, monitored by the eddy covariance techniques, to the strongest EI Nino event in 2015/2016 were investigated over a humid alpine meadow on the Northeastern Qinghai-Tibetan Plateau. Monthly air temperature (T-a) in August could be considered as a clear indicator of this event and was elevated by 44% (by 4.0 degrees C) in 2016, mainly due to a 204% (5.2 degrees C) increase in daily minimum To. On a diurnal scale, a paired-samples T-test between the El Nino duration (August in 2016) and the reference period (August in 2014 and 2015) revealed that the El Nino-induced increase in gross primary production (GPP, 0.078 gCm(-2).h(-1)) was lower than the growth in ecosystem respiration (RES, 0.12 gC.m(-2).h(-1)), resulting in an increase in net ecosystem CO2 exchange (NEE, 0.079 gC.m(-2).h(-1)). Diurnal evapotranspiration (ET) was significantly increased, by 8.6%, at a rate of 0.011 mm.h(-1). On a monthly scale, this ecosystem fixed less carbon by 58.7 g C.m(-2).month(-1) while ET water losses increased by only 6.2 mm.month(-1) in August. The alpine meadow thus acted as a carbon sink with a 36.2 g C.m(-2).year(-1) influx in 2015, but switched to a carbon source with a 21.6 g C.m(-2)year(-1) efflux in 2016, mainly due to a 78.7 g C.m(-2).year(-1) increase in RES. Annual ET increased by less 3%. The divergent responses of CO2 and H2O fluxes were mostly attributed to a great increase only in nocturnal To, which instantaneously stimulated RES but not ET. Our findings revealed that extreme nocturnal warming led to greater carbon losses and weaker compensatory carbon gains, highlighting the inconsistent response of carbon dynamics to gradual warming and to exceptional warmth in humid alpine meadows.
WOS关键词TERRESTRIAL ECOSYSTEMS ; INTERANNUAL VARIATIONS ; PRIMARY PRODUCTIVITY ; ENERGY-EXCHANGE ; CO2 EXCHANGE ; GRASSLAND ; CARBON ; DROUGHT ; CLIMATE ; CHINA
资助项目National Key RD Program[2017YFA0604801] ; National Key RD Program[2016YFC0501906-1] ; National Natural Science Foundation of China[41730752] ; National Natural Science Foundation of China[31270520] ; Qinghai Innovation PlatformConstruction Project[2017-ZJ-Y20] ; Natural Science Foundation of Qinghai Province[2016-ZJ-913]
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000444520600056
出版者ELSEVIER SCIENCE BV
资助机构National Key RD Program ; National Natural Science Foundation of China ; Qinghai Innovation PlatformConstruction Project ; Natural Science Foundation of Qinghai Province
源URL[http://ir.igsnrr.ac.cn/handle/311030/52955]  
专题中国科学院地理科学与资源研究所
通讯作者Zhang, Fawei; Cao, Guangmin
作者单位1.Luoyang Normal Univ, Coll Life Sci, Luoyang 471934, Henan, Peoples R China
2.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China
3.Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining 810001, Qinghai, Peoples R China
4.Qinghai Normal Univ, Coll Life & Geog Sci, Xining 810008, Qinghai, Peoples R China
5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Li, Hongqin,Zhang, Fawei,Wang, Wenying,et al. The strongest EI Nino event stimulated ecosystem respiration, not evapotranspiration, over a humid alpine meadow on the Qinghai-Tibetan Plateau[J]. ECOLOGICAL INDICATORS,2018,91:562-569.
APA Li, Hongqin.,Zhang, Fawei.,Wang, Wenying.,Li, Yikang.,Lin, Li.,...&Li, Yingnian.(2018).The strongest EI Nino event stimulated ecosystem respiration, not evapotranspiration, over a humid alpine meadow on the Qinghai-Tibetan Plateau.ECOLOGICAL INDICATORS,91,562-569.
MLA Li, Hongqin,et al."The strongest EI Nino event stimulated ecosystem respiration, not evapotranspiration, over a humid alpine meadow on the Qinghai-Tibetan Plateau".ECOLOGICAL INDICATORS 91(2018):562-569.

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来源：地理科学与资源研究所

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