干旱区生态环境知识资源中心(Arid): Energy fluxes and evapotranspiration over irrigated maize field in an arid area with shallow groundwater

Arid

DOI	10.1016/j.agwat.2019.105922
	Energy fluxes and evapotranspiration over irrigated maize field in an arid area with shallow groundwater
	Wang, Xingwang 1; Huo, Zailin 1; Shukla, Manoj K.2; Wang, Xianghao 1; Guo, Ping 1; Xu, Xu 1,3; Huang, Guanhua 1,3
通讯作者	Huo, Zailin
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2020
卷号	228
英文摘要	Precise estimations of energy fluxes and evapotranspiration for cropland in arid areas with shallow groundwater are necessary but limited. There is also a need to better understand the contribution of groundwater for meeting crop water consumptive use. In this study, considering the environmental conditions, such as meteorological variables, crop growth and water regimes, energy fluxes and actual evapotranspiration (ET alpha) in an irrigated maize field with shallow groundwater were examined using eddy covariance system during two growing seasons. Due to the energy imbalance of the eddy covariance method, latent heat (LE) was adjusted using the Bowen ratio preservation of energy principle and subsequently very close (R-2 = 0.94) to that measured by the Bowen-ratio-energy-balance system. For seasonal and diurnal variations, LE accounted for the highest proportion of net radiation (R-n) from the jointing stage. While LE/R-n was a little lower in 2018 than that in 2017 which may be because of the deeper groundwater table depth (WTD) in 2018. The negative sensible heat in the afternoon implied the occurrence of heat advection in the irrigated cropland. Energy fluxes and ET alpha were significantly affected by crop development when leaf area index was less than about 4 m(2) m(-2). Moreover, the increasing WTD from 1.2 to 2.2 m decreased LE by about 70 % and increased daily average Bowen ratio. From the jointing stage, total ET alpha was 522.1 and 453.8 mm in 2017 and 2018, respectively. The inter-seasonal variation in ETa was more dependent on water conditions than the potential evaporative demand. The water balance result showed that average WTD of 1.52 and 1.76 m for the growing period contributed to 36.3 % and 26.2 % ET alpha in 2017 and 2018, respectively. Besides, daily groundwater contribution between two seasons was different because of the differences in irrigation allocation and WTD. These results highlight the key effect of shallow groundwater to energy fluxes and water exchange of agroecosystem in arid areas.
英文关键词	Energy fluxes Maize evapotranspiration Groundwater contribution Irrigation schedule Eddy covariance
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000525279000038
WOS关键词	EDDY-COVARIANCE ; BALANCE CLOSURE ; LOESS PLATEAU ; WATER PRODUCTIVITY ; INNER-MONGOLIA ; SPRING MAIZE ; EXCHANGE ; HETAO ; SUNFLOWER ; CROPLANDS
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
来源机构	中国农业大学 ; New Mexico State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/313940
作者单位	1.China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China; 2.New Mexico State Univ, Plant & Environm Sci Dept, MSC 3Q,POB 30003, Las Cruces, NM 88003 USA; 3.China Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xingwang,Huo, Zailin,Shukla, Manoj K.,et al. Energy fluxes and evapotranspiration over irrigated maize field in an arid area with shallow groundwater[J]. 中国农业大学, New Mexico State University,2020,228.
APA	Wang, Xingwang.,Huo, Zailin.,Shukla, Manoj K..,Wang, Xianghao.,Guo, Ping.,...&Huang, Guanhua.(2020).Energy fluxes and evapotranspiration over irrigated maize field in an arid area with shallow groundwater.AGRICULTURAL WATER MANAGEMENT,228.
MLA	Wang, Xingwang,et al."Energy fluxes and evapotranspiration over irrigated maize field in an arid area with shallow groundwater".AGRICULTURAL WATER MANAGEMENT 228(2020).