干旱区生态环境知识资源中心(Arid): Coupling of net ecosystem CO2 exchange and evapotranspiration of irrigated maize field in arid areas

Arid

DOI	10.1016/j.jhydrol.2021.127140
	Coupling of net ecosystem CO2 exchange and evapotranspiration of irrigated maize field in arid areas
	Wang, Xingwang; Wang, Xianghao; Wei, Qiangli; Wang, Weishu; Wang, Shuai; Huo, Zailin; Lei, Huimin
通讯作者	Huo, ZL (corresponding author), China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	603
英文摘要	Understanding water and carbon fluxes over agroecosystem are fundamental for water resources management in arid areas. However, their dynamics and coupling at different temporal scales have not been well understood. Therefore, in this study, net ecosystem CO2 exchange (NEE) and evapotranspiration (ET) over irrigated maize field were monitored using eddy covariance system during two crop growing seasons in 2017 and 2018. The dynamics of NEE, ET and the resulted water use efficiency (WUE, defined as NEE/ET), and their responses to the meteorological and hydrological factors were investigated. At hourly scale, when ET increased at noon, NEE reached the plateau ahead of ET, which resulted in decreased WUE. The maize WUE changed during the growing season. Average daytime WUE at the heading stage was the largest: 9.52 and 8.57 g (CO2) kg(-1) (H2O) in 2017 and 2018, respectively. Photosynthetically active radiation (PAR) was the primary driver controlling diurnal dynamics of NEE and ET in irrigated maize field, while the opposite effects of vapor pressure deficit (VPD) on NEE and ET were identified. When the VPD increased from 0 to 3.3 kPa, the slope of the linear relationship between ET and PAR increased; whereas, the slope of the linear relationship between NEE and PAR decreased. At daily scale, the relationship between NEE and ET was generally linear with a slope of 8.59 g CO2 kg(-1) H2O, which could be attributed to their similar sensitivities in response to canopy conductance, PAR and soil water content. In addition, the effect of irrigation on WUE was different depending on the crop development stage and crop physiological activities. This study highlights that high VPD would decrease WUE of maize growing in irrigated agroecosystems in arid areas.
英文关键词	Maize field Net ecosystem CO2 exchange Evapotranspiration Water use efficiency Vapor pressure deficit
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000731711800006
WOS关键词	WATER-USE EFFICIENCY ; CARBON-DIOXIDE EXCHANGE ; CANOPY CONDUCTANCE ; DRIP IRRIGATION ; WINTER-WHEAT ; COTTON FIELD ; FLUXES ; GROUNDWATER ; GRASSLAND ; CROPLAND
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373975
作者单位	[Wang, Xingwang; Lei, Huimin] Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China; [Wang, Xingwang; Wang, Xianghao; Wang, Weishu; Wang, Shuai; Huo, Zailin] China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China; [Wei, Qiangli] Minist Agr & Rural Affairs, Acad Agr Planning & Engn, Beijing 100125, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xingwang,Wang, Xianghao,Wei, Qiangli,et al. Coupling of net ecosystem CO2 exchange and evapotranspiration of irrigated maize field in arid areas[J],2021,603.
APA	Wang, Xingwang.,Wang, Xianghao.,Wei, Qiangli.,Wang, Weishu.,Wang, Shuai.,...&Lei, Huimin.(2021).Coupling of net ecosystem CO2 exchange and evapotranspiration of irrigated maize field in arid areas.JOURNAL OF HYDROLOGY,603.
MLA	Wang, Xingwang,et al."Coupling of net ecosystem CO2 exchange and evapotranspiration of irrigated maize field in arid areas".JOURNAL OF HYDROLOGY 603(2021).