Journal of Integrative Agriculture ›› 2013, Vol. 12 ›› Issue (3): 541-551.DOI: 10.1016/S2095-3119(13)60255-5

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Assessing Crop Water Demand and Deficit for the Growth of Spring Highland Barley in Tibet, China

 LIU Zhao-fei, YAO Zhi-jun, YU Cheng-qun , ZHONG Zhi-ming   

  1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P.R.China
  • 收稿日期:2012-03-13 出版日期:2013-03-01 发布日期:2013-03-10
  • 通讯作者: Correspondence YAO Zhi-jun, Tel/Fax: +86-10-64889436, E-mail: yaozj@igsnrr.ac.cn
  • 作者简介:LIU Zhao-fei, Mobile: 15810542578, E-mail: zfliu@igsnrr.ac.cn;
  • 基金资助:

    This study was supported by the Innovation Program of Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (201003013) and the National Basic Research Program of China (2010CB951702).

Assessing Crop Water Demand and Deficit for the Growth of Spring Highland Barley in Tibet, China

 LIU Zhao-fei, YAO Zhi-jun, YU Cheng-qun , ZHONG Zhi-ming   

  1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P.R.China
  • Received:2012-03-13 Online:2013-03-01 Published:2013-03-10
  • Contact: Correspondence YAO Zhi-jun, Tel/Fax: +86-10-64889436, E-mail: yaozj@igsnrr.ac.cn
  • About author:LIU Zhao-fei, Mobile: 15810542578, E-mail: zfliu@igsnrr.ac.cn;
  • Supported by:

    This study was supported by the Innovation Program of Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (201003013) and the National Basic Research Program of China (2010CB951702).

摘要: The aim of this study was to assess the crop water demand and deficit of spring highland barley and discuss suitable irrigation systems for different regions in Tibet, China. Long-term trends in reference crop evapotranspiration and crop water demand were analyzed in different regions, together with crop water demand and deficit of spring highland barley under different precipitation frequencies. Results showed that precipitation trends during growth stages did not benefit the growth of spring highland barley. The crop coefficient of spring highland barley in Tibet was 0.87 and crop water demand was 389.0 mm. In general, a water deficit was found in Tibet, because precipitation was lower than water consumption of spring highland barley. The most severe water deficit were in the jointing to heading stage and the heading to wax ripeness stage, which are the most important growth stages for spring highland barley; water deficit in these two stages would be harmful to the yield. Water deficit showed different characteristics in different regions. In conclusion, irrigation systems may be more successful if based on an analysis of water deficit within different growth stages and in different regions.

关键词: Tibet , highland barley , Penman-Monteith , reference crop evapotranspiration , crop water requirement , cropcoefficient , crop water deficit

Abstract: The aim of this study was to assess the crop water demand and deficit of spring highland barley and discuss suitable irrigation systems for different regions in Tibet, China. Long-term trends in reference crop evapotranspiration and crop water demand were analyzed in different regions, together with crop water demand and deficit of spring highland barley under different precipitation frequencies. Results showed that precipitation trends during growth stages did not benefit the growth of spring highland barley. The crop coefficient of spring highland barley in Tibet was 0.87 and crop water demand was 389.0 mm. In general, a water deficit was found in Tibet, because precipitation was lower than water consumption of spring highland barley. The most severe water deficit were in the jointing to heading stage and the heading to wax ripeness stage, which are the most important growth stages for spring highland barley; water deficit in these two stages would be harmful to the yield. Water deficit showed different characteristics in different regions. In conclusion, irrigation systems may be more successful if based on an analysis of water deficit within different growth stages and in different regions.

Key words: Tibet , highland barley , Penman-Monteith , reference crop evapotranspiration , crop water requirement , cropcoefficient , crop water deficit