特大冰冻干扰对大明山自然保护区云贵山茉莉群落的影响

以广西大明山国家级自然保护区云贵山茉莉群落为对象,研究冰冻干扰对其影响。结果表明：云贵山茉莉建群种受损严重,其他共优势种受损较轻;云贵山茉莉受损类型划分为5种,以倒伏和压弯为主,分别占27.40%和26.71%,其次为断梢和断干,分别占21.23%和17.81%,翻蔸占6.85%;云贵山茉莉不同胸径的林木受损程度不同,胸径1.0～5.0 cm的林木压弯最多,胸径为5.1～10.0 cm的林木断干和断梢类型最多,胸径为15 cm以上的林木倒伏、翻蔸类型最多,胸径为10.1～15.0 cm的林木受损最低;云贵山茉莉萌芽更新能力强,其中以断梢类型的林木恢复能力最强,压弯和倒伏的次之,断干类型的较差,翻蔸类型最差。

The Effect of Unusual Freezing on the Houdendron Biaristatum Population in Daming Mountain Nature Reserve

This article deals with the effect of unusual freezing on the Houdendron biaristatum population in Daming Mountain Nature Reserve.The findings show that Houdendron biaristatum Population is severely damaged,and the damage can be divided into five degrees：lodging and bending,accounting for 27.40%and 26.71%respectively,the breakage of treetop and trunk,21.40%and 17.81%,root turnover,6.85%.The damage degree of the Houdendron biaristatum is different from biaristatum with different diameter at breast height（DBH）,those bended are mostly biaristatum with 1.0～5.0 cm DBH,those suffered the breakage of treetop and trunk are mostly the ones with 5.1～10.0 cm DBH,the lodging ones and the ones suffered roots turnover are mostly those with 15 cm DBH or above.And those having 5.1～10.0 cm DBH are least damaged;sprout regeneration of Houdendron biaristatum is very stong,those suffered the breakage of treetop are the most powerful,followed by the lodging and bending ones,those suffered the breakage of trunk is worse,and those with root turnover are the worst.