基于冠层温度的夏玉米旱情指数理论模型和经验模型的比较  

Comparisons Between the Empirical and Theoretical Models Based on Canopy Temperature for Monitoring Water Stress of Summer Maize

作　　者：俞龙[1] 王卫星[1] 崔晓[2] 孙道宗[1] 

机构地区：[1]华南农业大学工程学院,广东广州51064 [2]广东白云学院,广东广州510450

出　　处：《华南农业大学学报》2007年第3期110-112,共3页Journal of South China Agricultural University

基　　金：国家863计划节水农业专项子课题(2002AA2Z4071-02);广东省自然科学基金(032272)

摘　　要：对水分胁迫指数（CWSI）的经验模型和理论模型在华北平原夏玉米中的应用进行了对比，分析了2种模型与土壤含水量以及叶水势之间的关系，对比了2种模型得到的CWSI的日际变化.结果表明，经验模型经常性地溢出0～1的范围，理论模型则很少出现溢出0～1的范围，经验模型的日际变化较理论模型大，理论模型1 d中得到的CWSI变化很小；2种CWSI模型与土壤含水量均显著相关，可用于指导作物灌溉时间；CWSI理论模型与夏玉米叶水势的相关性较好，更能反映作物本身的水分状况.By analyzing crop water stress index （CWSI） for monitoring water stress with both Idso＇s empirical model and Jackson＇s theoretical model applied in summer maize in North China Plain, the CWSI variations and relationship between soil water content, leaf water potential and the empirical ＆ theoretical CWSI models were studied. The results showed that the values of empirical CWSI model were below the range of 0-1 frequently while the values of theoretical mode seldom behave so, and the daytime variation of the empirical CWSI model based on canopy temperature was bigger than that of the theoretical model. The CWSI models could be used for guiding irrigation schedule while the theoretical model was more reasonable due to its more interrelations with summer maize leaf water potential.

关 键 词：夏玉米 作物水分胁迫指数 经验模型 理论模型 

分 类 号：S275[农业科学—农业水土工程]