干旱区生态环境知识资源中心(Arid): Evaporative fraction and its application in estimating daily evapotranspiration of water-saving irrigated rice field

Arid

DOI	10.1016/j.jhydrol.2019.124317
	Evaporative fraction and its application in estimating daily evapotranspiration of water-saving irrigated rice field
	Liu, Xiaoyin 1,2,3; Xu, Junzeng 1,2,3; Zhou, Xinyi 1; Wang, Weiguang 2; Yang, Shihong 1,2,3
通讯作者	Xu, Junzeng
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	584
英文摘要	Evaporative fraction (EF), which is known to exhibit variation in response to changes in crop species, soil and meteorologic conditions, plays an important role in interpreting the components of energy budget and estimating evapotranspiration (ET), while such information is scarce for humid rice fields. The present study discussed the variation of energy balance components and then examined the pattern of hourly, daytime and daily EF after monitoring energy components by eddy covariance for water-saving irrigated (WSI) rice paddies of 2015 and 2016. Then the daily ET was estimated by an improved EF up-scaling method in the subtropical monsoon climate region of East China. Diurnally, hourly EF is deemed as an approximately concave-up shape in different growth stages of rice season. The seasonal average EF varies gently, with a minimum around 10:00-11:00 AM. Seasonally, the mean daytime EF for the whole growth stage is 0.86, 7% lower than the daily value. Daily EF exhibits mostly higher than 0.8 except later yellow ripening period, approaching 1.0 in the milk stage. EF over WSI rice exhibits obviously greater than the reports that from upland crops. In addition, differences are noted in the results with respect to the daily ET estimation by EF up-scaling method. The estimated daily ET (ETEF,d) from hourly EF during 10:00-11:00 h is highly correlated to the measured ET (ETtrue) by the weighed micro-lysimeters though the ETEF, d value is underestimated. Such a considerable gap serves in forming a relationship between ETEF, d and ETtrue,d, that is, by simply multiplying the representativeness ET value based on the EF up-scaling method by a correction procedure calibrated for this region. In conclusion, an improved EF up-scaling method is proposed for extrapolating remote sensing based ET estimates to daily values.
英文关键词	Rice Evaporative fraction Evapotranspiration Available energy Up-scaling method
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000527390200043
WOS关键词	ENERGY-BALANCE CLOSURE ; EDDY COVARIANCE ; CLIMATE-CHANGE ; CROP COEFFICIENTS ; ARID REGION ; LATENT-HEAT ; TIME ; MAIZE ; PADDY ; VARIABILITY
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	河海大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315001
作者单位	1.Hohai Univ, Coll Agr Engn, Nanjing 210098, Peoples R China; 2.Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China; 3.Hohai Univ, Cooperat Innovat Ctr Water Safety & Hydro Sci, Nanjing 210098, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiaoyin,Xu, Junzeng,Zhou, Xinyi,et al. Evaporative fraction and its application in estimating daily evapotranspiration of water-saving irrigated rice field[J]. 河海大学,2020,584.
APA	Liu, Xiaoyin,Xu, Junzeng,Zhou, Xinyi,Wang, Weiguang,&Yang, Shihong.(2020).Evaporative fraction and its application in estimating daily evapotranspiration of water-saving irrigated rice field.JOURNAL OF HYDROLOGY,584.
MLA	Liu, Xiaoyin,et al."Evaporative fraction and its application in estimating daily evapotranspiration of water-saving irrigated rice field".JOURNAL OF HYDROLOGY 584(2020).