A Preliminary Analysis of the Relationship between Longan Canopy Temperature and Air Temperature during Overwintering Period
[Objective] The study aimed to provide supports for developing chilling and freezing injury monitoring and disaster damage assessment of longan (Dimocarpus Longan Lour.). [Method] Based on field observation data, the relationships between longan canopy temperature and air temperature under different weather types (sunny, cloudy to sunny, cloudy, rainy, radiation chilling injury and advection chilling injury) in 2007-2008 winter were analyzed. [Result] Diurnal variations of longan canopy temperature under sunny and radiation chilling injury weather conditions were most dramatic, followed with those under cloudy to sunny condition, while variations under cloudy, rainy and advection chilling injury conditions were mild. Diurnal variations of orchard air temperature were also closely related to weather types. By using linear and curvilinear regression methods, the relationship models between longan canopy temperature and observation station air temperature were established. The models for cloudy, rainy and advection chilling injury had better effects than those for sunny, cloudy to sunny and radiation chilling injury; the models for night were better than those for daytime and the whole day.[Conclusion] To some extent, applying the relationship models between longan canopy temperature and observation station air temperature could make up the shortcoming of meteorological data which were higher than the real values.
NETL
NSTL
万方数据
