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《Journal of Glaciology and Geocryology》 2006-03
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Energy Balance in the Irrigational Intercropping Field in the Middle Reaches of Heihe River

WU Jin-kui~(1,2),DING Yong-jian~(1,2),SHEN Yong-ping~(1),WANG Gen-xu~(1) (1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.The Laboratory of Climate Study of China Metrological Administration,Beijing 100081,China)  
Based on experiments conducted in an intercropping field in Zhangye Oasis in the middle reaches of Heihe River in 2004,the characteristics of radiation budget are analyzed.Furthermore,energy balance is calculated by using Bowen-Ratio Energy Balance(BREB) method.It is found that the ratio of absorbed radiation to incoming short radiation in an intercropping canopy-soil system increases with growing stage,from 0.81 in the initial growing stage(IGS) to 0.86 in the end growing stage(EGS).The net radiation,which is smaller in IGS,increases rapidly in the first phase of the middle growing stage(MGS) and reaches the maximum in the second phase of MGS.Then it decreases somewhat in EGS.The ratio of net radiation to incoming radiation has a similar trend with the net radiation.In the whole growing stage,latent heat flux,which takes up 70% or so of the net radiation,is the dominant item in energy balance.Sensible heat flux shares 20% of the net radiation and soil heat flux accounts for 10%.The characteristics of energy balance vary distinctly with growing stages.In the IGS,the ratios of latent heat flux,sensible heat flux and soil heat flux are 44.5%,23.8% and 31.7%,respectively.In the MGS,with the increase of latent heat flux and the decrease of sensible heat flux and soil heat flux,the ratios turn into 84.4%,6.3% and 9.3%.In the EGS,the soil heat flux maintains 0 W\5m~(-2)or so.The net radiation can be divided into two parts: latent heat flux and sensible heat flux.The former and the latter take up 61.4% and 38.6%,respectively.The energy balance also shows an obvious daily variation.
【Fund】: 中日合作项目“黑河流域水文过程研究”;; 中国气象局气候变化专项(CCSF-2005-2-QH39)资助
【CateGory Index】: S181
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