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冠层温度信息是作物水分状况诊断信号之一,红外热像仪能实时准确地获取较大区域的温度分布.本文以棉花为研究对象,针对红外热像仪获取冠层温度的主要影响因素(方位、角度和距离)开展试验,研究了不同水分处理下不同方法获取的作物水分胁迫指数(CWSI)与土壤含水率(SWC)、叶水势(LWP)和气孔导度(gs)之间的相互关系.结果表明:逆太阳光与冠层45°夹角获取的CWSI与SWC、LWP和gs具有较好的相关性,是观测冠层温度的适宜方法;随着距离的增大,冠层温度会表现出衰减的现象,远距离的拍摄需要进行必要的校准工作;通过分析干湿参考表面温度与冠层温度之间的关系,提出了适合华北地区棉花水分胁迫指数的简化计算模式.
The canopy temperature information is one of the diagnostic signals of crop water status, and the infrared thermal imager can get the temperature distribution in a large area in real time.In this paper, cotton was taken as the research object and the main influencing factors of the canopy temperature (CWS), soil water content (SWC), leaf water potential (LWP) and stomatal conductance (gs) under different water treatments were studied in this paper. The results show that CWSI and SWC, LWP and gs obtained from the 45 ° angle between the sun and the canopy have a good correlation, which is a suitable method to observe the canopy temperature. As the distance increases, the canopy temperature Will show the phenomenon of attenuation, long-range shooting need to carry out the necessary calibration work; by analyzing the wet and dry reference surface temperature and the relationship between the canopy temperature, put forward a suitable for North China cotton water stress index simplified calculation mode.