| 基于冠层温度的冬小麦水分胁迫指数的实验研究 |
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| 引用本文： | 刘学著,刘守华.基于冠层温度的冬小麦水分胁迫指数的实验研究[J].应用气象学报,1995,6(4):449-453. |
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| 作者姓名： | 刘学著 刘守华 |
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| 作者单位： | 1.北京农业大学农业气象系，湖北省荆州农业气象试验站 |
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| 摘 要： | 在田间实验基础上对冬小麦田逐日14时基于冠层温度的作物水分胁迫指数，（CWSI）进行了计算和分析。同一时刻干旱处理CWSI高于湿润处理；麦田灌溉后CWSI4～6天降到极小值，表明了灌水后作物从水分胁迫状态恢复所需的时间；从本次灌溉后CWSI达到极小值至再次灌溉期间，CWSI呈持续增加趋势。这些表明CWSI较好地反映了因土壤供水不足导致的作物水分胁迫。CWSI与叶水势之间呈明显的负相关关系。CWSI等于0.4，相当于实际蒸散与可能蒸散的比率为60%，是指示冬小麦发生严重水分胁迫的关键性指标。
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| 关 键 词： | 冬小麦 冠层温度 作物水分胁迫 |
An Experimental Study of Winter Wheat Water Stress Index Based on the Canopy Temperature |
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| Liu Xuezhu,Zhang Liangen.An Experimental Study of Winter Wheat Water Stress Index Based on the Canopy Temperature[J].Quarterly Journal of Applied Meteorology,1995,6(4):449-453. |
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| Authors: | Liu Xuezhu Zhang Liangen |
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| Institution: | 1.1) (Beijing Agricultural University, Beijing 100094); 2) (Jiangzhou Agrometeorological Experimental Station of Hubei Province, Jiangzhou 434100) |
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| Abstract: | The crop water stress index (CWSI) based on the daily canopy temperature at 14 : 00, has been calculated on the basis of winter wheat field experiment. The results indicate that the CWSI with drying process higher than that with wet process at the same time; after 4~6 days of irrigation, CWSI drops to a minimum, it is a period of plant recovering from a stressed condition. And, the steady increase trend of CWSI between two times of irrigation shows that crop water stress increases with time in this period. The above inclusions show that the plant water stress is due to the lack of water. There is obvious negative correlation between CWSI and leaf water potential. When CWSI equals 0.4, it could be a critical index in indicating winter wheat water stress. |
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| Keywords: | heat Canopy temperature Crop water stress |
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