A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain

doi:10.1139/cjss-2020-0050

	A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain
	Wang, Fangfang 2,3; Ma, Donghao 2; Zhao, Wenju 1; Lu, Yunxuan 2; Zhou, Ding 2,5; Zhang, Jiabao 2; Chen, Lin 2; Huang, Ping 4
刊名	CANADIAN JOURNAL OF SOIL SCIENCE
	2021-03-01
卷号	101 期号:1 页码:134-146
关键词	energy balance flux measurement wheat (winter) maize (summer) field-scale measurement
ISSN号	0008-4271
DOI	10.1139/cjss-2020-0050
通讯作者	Ma, Donghao(dhma@issas.ac.cn) ; Zhang, Jiabao(jbzhang@issas.ac.cn)
英文摘要	Accurate determination of evapotranspiration (ET) has tremendous potential in guiding irrigation and improving the efficiency of water resources utilization in the North China Plain. Eddy covariance (EC) method is currently a popular method for determining field-scale ET. However, due to varying foot print and unclosed energy balance, the applicability of EC in different regions needs to be tested and corrected. In present work, we compared the ET of the winter wheat - summer maize rotation cropland measured by the EC method with the ET measured by large-scale lysimeters on different time scales. The degree of energy balance closure of EC measurements in this region is 78%. After adjusted by using Bowen ratio forced closure method, the ET monitored by EC is comparable with those monitored by large-scale lysimeters. The results also indicated that the consistency of the observed ET by the EC and lysimeters got better with an increasing time scale, especially for the multi-year average ET values with a relative deviation of less than 1%. The short-time events such as irrigation and precipitation and the mismatch of the varying footprint area of the EC and the small fixed source area of the lysimeter should be responsible for the discrepancy of ET in two methods on daily scale. However, the factors of crop biomass, total available water, and local climate condition exert more effects on the observed ET on large time scale. Overall, the EC technique is responsible for ET measurement of winter wheat - summer maize rotation cropland of the North China Plain.
资助项目	National Natural Science Foundation of China[41671228] ; National Key Technology Research and Development Program of China[2016YFD0300802] ; State Key Laboratory of Soil and Sustainable Agriculture[Y812000005] ; earmarked fund for China Agriculture Research System[CARS-03]
WOS研究方向	Agriculture
语种	英语
出版者	CANADIAN SCIENCE PUBLISHING
WOS记录号	WOS:000626319200013
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/13136]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Ma, Donghao; Zhang, Jiabao
作者单位	1.Hydrol & Water Resources Survey Bur, Xinxiang 453000, Henan, Peoples R China 2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, State Expt Stn Agroecosyst Fengqiu, Nanjing 210008, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China 5.Hunan Agr Univ, Changsha 410128, Peoples R China
推荐引用方式 GB/T 7714	Wang, Fangfang,Ma, Donghao,Zhao, Wenju,et al. A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain[J]. CANADIAN JOURNAL OF SOIL SCIENCE,2021,101(1):134-146.
APA	Wang, Fangfang.,Ma, Donghao.,Zhao, Wenju.,Lu, Yunxuan.,Zhou, Ding.,...&Huang, Ping.(2021).A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain.CANADIAN JOURNAL OF SOIL SCIENCE,101(1),134-146.
MLA	Wang, Fangfang,et al."A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain".CANADIAN JOURNAL OF SOIL SCIENCE 101.1(2021):134-146.