关键词: 雨雪冰冻灾害, 受害程度, 森林凋落物, 非正常凋落物, 南岭, 杨东山十二度水自然保护区

Abstract: Based on the survey data of the evergreen and deciduous broadleaved mixed forest damaged by the frozen rain and snow at the plots in Yangdongshan Shierdushui Nature Reserve,Guangdong Province in early 2008.The forest damage degree and the existing falling biomass at different altitudes were investigated.The result showed that,the damage degree of the forest was directly proportional to the altitude.From 700 to 1 000 m of altitude,the vegetation damage was serious,and the abnormal litterfall was 13.96～19.59 t·hm^-2,and the total existing litterfall was 23.39～29.97 t·hm^-2,which was much higher than that of the usual annual amount.The disaster might also cause further potential dangers of secondary disasters.It was necessary to take appropriate health clearance of woodland,and other measures to promote renew and rehabilitation,for quickly restoring forest resources and the ecological environment.

Key words: frozen rain and snow disaster, harm degree, forest litterfall, abnormal litterfall, Nanling Mountain, Yangdongshan Shierdushui Nature Reserve