title: [Rapid measurements of CO2 flux density and water use efficiency of crop community].
abstract: In this paper, Eddy Correlation (EC) method was employed to measure the latent heat and CO2 flux density and to calculate Water Use Efficiency (WUE) of winter wheat community in Yucheng district, Shandong Province in 1997. The results showed that the CO2 flux density had an obvious diurnal change, with a maximum about 1.5 mg x s(-1) x m(-2), which appeared at about 9:00-10:00 am in general. The WUE of wheat community presented a fall trend from morning to afternoon, and the CO2 flux density and WUE also had an obvious seasonal change, being lower in the early and late growth stages, and higher in the middle growth stage. The ranges of daily mean CO2 flux density and WUE were 0.2-0.9 mg x s(-1) x m(-2) and 5-20 gCO2 x kg(-1) H2O, respectively.
authors.affiliation: Institute of Geographical Sciences and Resources, Chinese Academy of Sciences, Beijing 100101, China. zhuzl@igsnrr.ac.cn
authors.forename: Zhilin
authors.initials: Z
authors.lastname: Zhu
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Sun
authors.forename: Renhua
authors.initials: R
authors.lastname: Zhang
authors.forename: Hongbo
authors.initials: H
authors.lastname: Su
authors.forename: Xinzai
authors.initials: X
authors.lastname: Tang
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism*; D017753:Ecosystem; D010788:Photosynthesis / Q000502:physiology*; D018526:Plant Transpiration; D014908:Triticum / Q000737:chemistry / Q000378:metabolism*; D014867:Water / Q000032:analysis / Q000378:metabolism*
chemical_list: D014867:Water; D002245:Carbon Dioxide