几种果树防冻措施效果的观测分析

Effect Analysis of Various Preventing Frostbite Methods in Orchard

对果农已采用稻草遮盖、套袋和准备采用遮阳网遮盖的防冻措施进行最低温度的对比观测。结果表明:用稻草遮盖防冻效果好;用遮阳网遮盖的防冻效果不佳;用编织袋和塑料袋进行套袋反而会加重冻害。防冻措施的观测值与相应的对比值相关密切。

Based on cloud-top brightness temperature data and circulation background, and the physical quantities, Diagnosis of severe convection weather caused by MCS in Mei-yfi front over the Yellow Sea-Changjiang River during June 21 to 23, 2002 is made. The results show that the MCS is main system of the heavy rainfall in Mei-yuefront over Changjiang River Basin. There is close relationship between the heavy rainfall center and the high occurrence frequency center of convection and deep convection. The frequency of FM（TBB≤-32℃）and Fs （TBB≤-52℃） can reflect the characteristics of rainfall well and better than the low value center of TBB. In addition, the severe heavy rainfall was caused by the interaction among Mei-yue front, lower level shear line and upper level Tibet high.