冠层温度指导冬小麦灌溉的试验研究  

Experimental Study on Using Canopy Temperature to Guide Winter Wheat Irrigation

作　　者：史宝成[1] 刘钰[2] 蔡甲冰[2] 

机构地区：[1]长江大学石油工程学院,湖北荆州434023 [2]中国水利水电科学研究院,北京100044

出　　处：《节水灌溉》2008年第4期11-14,共4页Water Saving Irrigation

基　　金：国家自然科学基金项目(50479043);水利部科技创新项目(SCX2003-14)

摘　　要：在冬小麦主要生育期,测定了6个不同水分处理的冠层温度、气温以及土壤含水率,计算了冠气温差并分析了它们之间的相互关系。结果表明：作物水分胁迫指数CWSI和冠层-空气温差（Tc-Ta）是利用冠层温度评价作物水分状况的重要方法。冠层温度和冠气温差都有明显的日变化过程,其中冠层温度在下午14：00前后达到最大值;中午12：00～14：00时段冠气温差反应冬小麦的供水状况最具代表性;冬小麦适宜水分处理的冠气温差阈值为-1.5℃〈ΔT〈1.3℃。冬小麦旺盛生长期间（15/4～25/5）的水分胁迫指数平均值与最终籽粒产量的关系是一种非线性的关系,平均水分胁迫指数在0.18～0.23范围为冬小麦的最优供水标准。In the main growth stage of winter wheat,crop canopy temperature,air temperature and soil water content of six different water treatments were measured,the temperature difference between canopy and air（Tc-Ta） was calculated and the relationship among them was analyzed.The result indicated that CWSI and Tc-Ta were two important indexes for assessing crop water status according to crop canopy temperature.The diurnal variation of canopy temperature（Tc） and Tc-Ta was obvious.Tc reached the maximum value at 14：00,and the value of Tc-Ta at 12：00～14：00 could best reflect the water status of winter wheat.The appropriate range of Tc-Ta was-1.5～1.3℃.The relation between the average value of CWSI in bloom growth stage（15/4～25/5） and the final yield was nonlinear.The best average value of CWSI for winter wheat was 0.18～0.23.

关 键 词：冠气温差 水分胁迫指数 土壤含水率 

分 类 号：S2[农业科学—农业工程]