摘要
作物冠气温差即冠层—空气温度差,它可以反映作物的水分状况。在不同的土壤水分条件下,用便携式红外测温仪和Li-6400光合仪采集了冬小麦主要生长期的冠层温度和蒸腾速率进行分析,结果表明,在冬小麦的主要生长期内,其冠气温差和蒸腾速率存在密切联系:冠气温差和蒸腾速率的日变化规律基本一致;在冠气温差较小时,随冠气温差的增大,蒸腾速率呈上升趋势,而当冠气温差>0℃后,随冠气温差的增大,蒸腾速率不再增加,甚至出现下降趋势。
Crop canopy temperature reflects the crop＇s water status. Under the different hydraulic gradients, using the portable infrared thermometer and the Li-6400 photosynthesis system, the canopy temperature and transpiration rate of winter wheat at the main growing stages were colleeted. The results showed that there was a close relationship between the canopy-air temperature differences and the transpiration rates： the trend of the diurnal change of canopy-air temperature, differences and the diurnal variation of transpiration rates was consistent; transpiration rates increased with the increase of canopy-air temperature difference when it was smaller and the transpiration rate decreased when canopy-air temperature difference was greater than 0℃.
出处
《山西农业科学》
2011年第9期939-942,共4页
Journal of Shanxi Agricultural Sciences
基金
国家自然基金项目(50909098)
关键词
冬小麦
冠层温度
冠气温差
蒸腾速率
winter wheat
canopy temperature
canopy-air temperature difference
transpiration rate
