Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai-Tibetan Plateau

doi:10.1002/eco.1925

NWIPB OpenIR

	Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai-Tibetan Plateau
	Zhang, Fawei 1,3,4; Li, Hongqin 1; Wang, Wenying 2; Li, Yikang 1; Lin, Li 1; Guo, Xiaowei1 ; Du, Yangong 1; Li, Qian 1; Yang, Yongsheng 1; Cao, Guangmin 1,4; Li, Yingnian 1
	2018-03-01
发表期刊	ECOHYDROLOGY
卷号	11 期号:2
文章类型	Article
摘要	Accurately quantifying evapotranspiration (ET) is crucial to fully understanding regional water resource management and potential feedbacks to climate change in alpine grasslands. The quantitative relationships between ET and environmental controls were investigated by a continuous eddy covariance dataset from June 2014 to December 2016 over an alpine Kobresia meadow on the northeastern Qinghai-Tibetan Plateau. The results showed that daily ET averaged 1.7 +/- 1.5mm/day (Mean +/- 1S.D.), with values of 2.9 +/- 1.3, 1.6 +/- 1.0, and 0.7 +/- 0.6mm/day during the growing season, seasonal transition period, and nongrowing season, respectively. Cumulative growing season ET was 63% of annual ET with little annual variability (349.9 +/- 12.1mm). Paired-samples t-test analysis indicated that monthly ET was larger than maximum potential ET derived from the FAO-56 reference crop ET by 17% (p<.001, N=12) in the growing season, likely because of high aerodynamic conductance, but was less than the minimum equilibrium ET by 19% (p<.001, N=14) during the nongrowing season owing to limited surface moisture availability from the frozen soil. The structural equation models revealed that daily ET was mostly dominated by net radiation (the standardized coefficient of the total effect was 0.78). Soil surface moisture and leaf area index played secondary roles in daily ET variability during the nongrowing season and growing season, respectively. At an annual scale, the bulk surface conductance (8.25-10.65mm/s), decoupling coefficient (0.43-0.48, 0.61 in the growing season), and the ratio of ET to equilibrium ET (1.08-1.33) were consistent with the strongly energy-limited conditions in the alpine meadow. This study indicated that initial vegetation rehabilitation on the severely degraded meadow would be at the risk of rapid water consumption in humid alpine regions.
关键词	Alpine Meadow Eddy Covariance Technique Evapotranspiration Structural Equation Model Water Balance
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI	10.1002/eco.1925
关键词[WOS]	ENERGY-EXCHANGE ; WATER-VAPOR ; INTERANNUAL VARIATIONS ; TEMPERATE GRASSLAND ; HEAT-FLUX ; ECOSYSTEM ; EVAPORATION ; CHINA ; FOREST ; COMPONENTS
收录类别	SCI
语种	英语
项目资助者	National Key RD Program(2016YFC0501802 ; National Natural Science Foundation of China(41730752) ; International Cooperation Research Program of Qinghai Province(2015-HZ-804) ; Qinghai Innovation Platform Construction Project(2017-ZJ-Y20) ; Natural Science Foundation of Qinghai Province(2016-ZJ-943Q ; 2016YFC0501906-1) ; 2016-ZJ-913)
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
WOS类目	Ecology ; Environmental Sciences ; Water Resources
WOS记录号	WOS:000426498700003
引用统计	被引频次：38[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/363003/13321
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, 23 Xinning St, Xining 810001, Qinghai, Peoples R China 2.Qinghai Normal Univ, Xining 810008, Qinghai, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Restorat Ecol Cold Reg Qinghai Prov, Xining 810001, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Fawei,Li, Hongqin,Wang, Wenying,et al. Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai-Tibetan Plateau[J]. ECOHYDROLOGY,2018,11(2).
APA	Zhang, Fawei.,Li, Hongqin.,Wang, Wenying.,Li, Yikang.,Lin, Li.,...&Li, Yingnian.(2018).Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai-Tibetan Plateau.ECOHYDROLOGY,11(2).
MLA	Zhang, Fawei,et al."Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai-Tibetan Plateau".ECOHYDROLOGY 11.2(2018).