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在冬小麦主要生育期,测定了3个不同水分处理冠层温度、气温、地面土壤温度以及土壤含水率和叶面积指数,计算了冠气温差和饱和差及相对湿度,并分析了冠气温差与土壤含水率和叶面积指数和饱和差及相对湿度间的关系。结果表明:不同的灌溉措施对冠气温差有显著的影响;14:00左右在冠层之上高度处的冠气温差能反映作物的水分特征,可以用此时刻的实测结果来检验遥感数据反演冠气温差的精度;在60～80cm土层的土壤体积含水率能较好地反映14:00冠层之上冠气温差的变化情况,不同水分处理二者的关系显著,复相关系数分别为0.65809(节水灌溉),0.99577(充分灌溉),0.78206(不灌溉);不同水分处理下的冬小麦主要生育期的叶面积指数与冠气温差相关性显著,冠层之上二者的相关系数分别为:0.76082(节水灌溉),0.40548(充分灌溉),0.99001(不灌溉),这为区域遥感反演作物冠气温差来监测土壤含水率及作物估产提供了依据。
The canopy temperature, air temperature, ground soil temperature and soil water content and leaf area index of three different treatments of water were measured during the main growth period of winter wheat. The difference of crown temperature and saturation difference and relative humidity were calculated. Relationship between Soil Moisture and Leaf Area Index, Saturation Difference and Relative Humidity. The results showed that different irrigation measures had a significant impact on the temperature difference of the canopy air temperature; the difference of the canopy temperature at the altitude above the canopy about 14:00 could reflect the moisture characteristics of the crop, and the measured data at this moment could be used to test the remote sensing data The accuracy of the temperature difference between the crown and the crown; the soil moisture content in the 60 ~ 80cm soil layer can better reflect the change of the canopy temperature difference above 14:00 canopy, the relationship between the different water treatments is significant, the complex correlation coefficient 0.65809 (water-saving irrigation), 0.99577 (full irrigation) and 0.78206 (no irrigation). The leaf area index of winter wheat under different water treatments was significantly correlated with canopy temperature difference. The correlation coefficient Which are 0.76082 (water-saving irrigation), 0.40548 (full irrigation) and 0.99001 (no irrigation), respectively. This provided the basis for monitoring the soil moisture content and crop yield by retrieving the crop canopy temperature difference by remote sensing.