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《Agricultural Research in the Arid Areas》 2012-02
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Variation and interrelationship of winter wheat canopy temperature,leaf water potential and water use efficiency under different water treatments

LI Li,SHEN Shuang-he,LI Yong-xiu,HAN Xiao-mei,WANG Xiu-min,LI Qian,ZOU Xue-zhi(College of Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing,Jiangsu 210044,China)  
To reveal the variation and interrelationship of winter wheat canopy temperature,leaf water potential and transpiration rate and water use efficiency,we designed five different degrees of drought stress through plot culture in rainproof installations,in which the water content was 45%,55%,65%,70% and 80% of field capacity respectively.The results showed that with the increase in the amount of irrigation for each treatment,the average and maximum canopy temperature showed a downward trend as leaf water potential and transpiration rate showed a rising trend overall,when the wheat suffered the most severe drought stress in the heading stage,it showed the greatest water use efficiency,and it decreased by 50.70% overall at flowering stage compared with that at heading stage;Correlation analysis showed that canopy temperature and air saturation deficit was in very significant positive correlation at heading stage(P0.01),and at flowering stage,canopy temperature and leaf water potential was in significant negative correlation(P0.05),canopy temperature and air saturation deficit was in very significant positive correlation,air saturation deficit and transpiration rate was in significant negative correlation,canopy temperature and water use efficiency was in significant positive correlation.To sum up,at heading and flowering stages of wheat,canopy temperature can be used as one of the effective indexes to monitor water status of crops.
【Fund】: 国家重点基础研究发展计划(973计划)课题(2010CB950702)
【CateGory Index】: S512.11
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