关键词: 水稻, 植株温度, 气温, 模型, 温敏核不育

Abstract: Plant temperature and its relations to the micro-climate of rice canopy and the factors of irrigation water were studied under irrigation treatment(10-15 cm water layer) and CK(no water layer) using a thermo-sensitive genic male sterile(TGMS) rice,Pei′ai 64S as material.There were both value and phasic differences between the rice plant temperature and air temperature at 150 cm height.From 8:00 to 20:00,the plant temperature was lower than air temperature,whereas was close during 21:00 to next 7:00.The maximum of plant temperature appeared one hour earlier than that of air temperature,whereas both reached the minimum at 6:00.The fluctuation of plant temperature was lower than that of air temperature.At a certain height,during 6:00-13:00,the plant temperature was higher,and one hour earlier reached the maximum compared with air temperature,however,during the other time,the plant temperature was close or even a little lower than air temperature under sunny days.Contrastively,on overcast days,the plant temperature was higher than air temperature in all day,and both maximized at the same time.Plant temperature was controlled by solar radiation,and modified by cloudage and wind in the daytime.Moreover,plant temperature was mainly affected by irrigation water at night.In the present experiment,air temperature(Ta) of 29.6℃ was the critical point.WhenTa>29.6℃,irrigation water would decrease plant temperature,otherwise increase.The plant temperature and the temperature difference of water-air showed a conic relation.Rice leaf absorbs or reflects solar radiation during daytime,and countercheck the loss of heat during night time,thereby mitigating plant temperature fluctuation.By correlation analysis and coefficient simulation,two effective practical models of plant temperature were established.

Key words: rice, plant temperature, air temperature, simulation model, thermo-sensitive genic male sterility