杉木人工林冰雪灾害受灾和萌生情况调查及影响因子分析

Ice and Snow Damage and Subsequent Sprouting of Cunninghamia lanceolata(Taxodiaceae) Plantation and Their Related-Factors Analysis

以九龙山国家级自然保护区的主要公益林杉木人工林作为研究对象,选择具有代表性的受灾区域,自海拔700 m至900 m设置样地,共10块样地,总面积4 000 m2。分析其受2008年初严重冰雪灾害破坏及灾后萌生情况与胸径、树高、尖削度、海拔之间的关系。结果表明: 1)杉木人工林损害严重,其中断冠、断干植株比例较高,而掘根和冻死植株相对较少;杉木具有极强的萌生能力,以断冠杉木的萌生能力最强。2)不同胸径、树高、尖削度的杉木对于冰雪灾害的抵御能力及萌生能力存在一定差异,小径级矮小的个体受灾较重,易被冻死和掘根,大径级的较高个体受灾相对较轻,主要表现为断冠和断干危害,且不同径级下的受灾杉木上部萌生均占较大比例。3)杉木的抵御能力和萌生能力与海拔存在一定的关系,高海拔地区杉木受灾较重,而中海拔地区的杉木萌生能力相对较强。

According to the investigation on the Cunninghamia lanceolata forest plantation in the Jiulongshan Nature Reserve,Zhejiang Province,China,differences in resistance ability to ice and snow damage and sprouting ability of Chinese fir （Cunninghamia lanceolata） due to the severe ice and snow storms occurred between January and February 2008 were to be analyzed among different DBH,tree height,taperness and altitude.The results showed that the Chinese fir plantations at this site were severely damaged,The crown breakage and stem breakage exhibited higher proportion of the damage,while uprooting and died of freezing exhibited lower proportion.The Chinese fir possessed exceedingly strong sprouting ability,and the crown breakage plant possessed highest.Significant differences of resistance ability and sprouting ability of Chinese fir were observed among different DBH and the different tree height,the shorter trees with smaller DBH were more likely to be heavier afflicted by uprooting and died of freezing,while the taller ones with higher DBH were more likely to be lighter afflicted by crown breakage and stem breakage.The top sprouting exhibited greater proportion.The trees in the high altitude area were more heavily afflicted and the ones in mid-altitude area possessed stronger sprouting ability.