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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (06): 1105-1110.doi: 10.3724/SP.J.1006.2013.01105

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Variation of Priestley-Taylor Model Parameter in Rain Fed Spring Maize Field

GUO Jia-Xuan1,MEI Xu-Rong2,LI Qiao-Zhen2,YAN Chang-Rong2,LI Yu-Zhong2,*   

  1. 1 Beijing Key Laboratory for Agricultural Application and New Technique, College of Plant Science and Technology, Beijing University of Agriculture, Beijing 102206, China; 2 Water Resources and Dryland Farming Laboratory, Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China??
  • Received:2012-10-16 Revised:2013-01-18 Online:2013-06-12 Published:2013-03-22
  • Contact: 李玉中, E-mail: liyz-jie@163.com, Tel: 010-82109399
  • About author:李玉中, E-mail: liyz-jie@163.com, Tel: 010-82109399

Abstract:

The study on Priestley-Taylor (PT) reference crop evapotranspiration model coefficient (α) in local area is of great significance in semi-arid agricultural water resources efficient use and precision irrigation in corn. Here, based on the FAO (1998)-recommended Penman-Monteith (PM) reference crop evapotranspiration as a standard method, we determined the water and heat exchange and its estimated parameters by the eddy covariance technique and Priestley-Taylor model under local climatic conditions. The results indicated that the estimated values of reference crop evapotranspiration (ET0-PT 1.26) gained from PT model-recommended coefficient (α = 1.26) lowed by 21.2% on an average during non-growth stages (from November to April next year), and reached an average of 5.5% higher than those from PM model reference crop evapotranspiration (ET0-PM) from May to September. The local PT model coefficient α value was 1.15 ± 0.06. The average PT model coefficient at noon during growth stages showed a single peak changing trend with the highest value of 0.67 ± 0.08 from tasseling to flowering stage and with the lowest value of 0.26 ± 0.13 at seedling stage. In conclusion, if the reference crop evapotranspiration is necissery to be estimated accurately by PT model in the semi-arid climate area, the local PT parameters should be studied firstly.

Key words: Rain fed spring maize, Priestley-Taylor parameter, Reference crop evapotranspiration, Eddy correlation method

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