Abstract: Based on the observation data in 2005, this paper analyzed the seasonal variations of the canopy temperature and the air temperature above and below the canopy in a tropical seasonal rainforest in Xishuangbanna of Southwest China. The results showed that at the same layers, the canopy temperature was higher than the air temperature except at nights of foggy-cool season. At most time of foggy-cool and dry-heat seasons, the air temperature above the canopy was higher than that below the canopy, while there was an opposite trend at noon time. In the rain season with higher mean air temperature, the air temperature above the canopy was all along higher than that below the canopy. The differences in the variations of the air temperature above and below the canopy presented the feedback effect of the seasonal tropical rainforest canopy to the microclimate in the forest. At the night time of foggy-cool season, the canopy temperature and air temperature differed with those at other time, suggesting that the low temperature at the nights of foggy-cool season was the key limiting factor for the existence of tropical seasonal rainforests in Xishuangbanna.

Key words: Sogatella furcifera, Electronic monitoring, Feeding behavior, Virulence, Rice