关键词: 湿地松, 基本密度, 雨雪冰冻, 受害原因

Abstract: Investigation on the damage of Pinus elliottii in the freezing rain and snow area of southern China was done in 2008.The results of the survey in 15 forest region revealed that the damage of P.elliottii,which have the same age and altitude location approximately,was increased from about latitude 30°—26° N in southern China.The percentage of broken and collapsed trees was up to 80%.The 13～18 years old P.elliottii in the same forestry center were damaged most heavily because these stands with DBH lower than 20 cm were illegally taped early.While the 20-year-old P.elliottii with DBH about 20 cm were damaged heavily either because being taped for several years.The single pine with higher basic density and DBH usually couldn't be overpowered in the damaged forest although no significant differences exist between the damaged and undamaged stands in one forest area.The unmanaged stand was more susceptible to break and uproot than the managed one.

Key words: Pinus elliottii, basic density, freezing rain and snow, reason for the damage