广西科学Issue(5)：454-462,9.
特大冰冻干扰对大明山常绿阔叶林树冠及林冠层状况的影响
Effects of a Severe Ice Storm Disturbance on Crown and Canopy Condition of an Evergreen Broad-leaved Forest in Damingshan National Nature Reserve of Guangxi Province
摘要
Abstract
[Objective]Through field investigation of 72 permanent plots (each 400m2 )of the south subtropical montane evergreen broad-leaved forest in Damingshan Nature Reserve of Guangxi province,this paper deals with the effects of a severe ice storm disturbance on the crown and canopy condition of south subtropical montane evergreen broad-leaved forest in Guan-gxi province.[Methods]In 2009,3 groups of plots were set up in the ice storm-damaged mon-tane evergreen broad-leaved forest in Damings-han National Nature Reserve,with altitude ranged from 934m to 1223m,and divided into upper slope,middle slope and lower slope,where each group was further divided into 40 sub-plots and each had the plot of 400m2 .Within each subplot,all trees that their diameter at breast height (DBH)was equal to or larger than 5.0cm were identified,mapped and tagged at breast height (1.3m from the base)with pre-numbered aluminum tags,and then the DBH,stem heights,crown length,crown width,damage type of these taged trees were measured.[Results]The evergreen broad-leaved forest of Damingshan National Nature Reserve were affected se-verely by the ice storm as the damaged trees accounted for 67.53% of the total individuals with DBH≥5.0cm.Among of them slightly damaged individuals accounted for 47.75% and severely damaged ones accounted for 19.78%.The ratio of slightly damaged trees was minimum at up-per slope (40.94%)while it was maximum at middle slope (52.38%).On the contrary,the ra-tio of severely damaged individuals was maximum at upper slope (26.49%)while minimum at middle slope (16.52%).However,the ratio of damaged individuals at lower slope was the most low among the three slope positions.The DBH was a sensitive index influencing the type and extent of tree damage.The more larger the DBH was,the more severe damage the tree crown suffered.The ratio of broken branch (including slight branch loss and severe branch loss)in-creased as the DBH increasing,whereas the breakage within crown and whole-crown loss de-creased with increasing of DHB.The deciduous trees tended to show severe damage than ever-green trees.After ice storm damage,the leaf area index (LAI)was significantly reduced while scattering light transmission coefficient (TD)and direct transmission coefficient (TR)were significantly increased.[Conclusion]This severe ice storm caused severe damage to evergreen broad-leaved forest in Damingshan.The crown and canopy condition of evergreen broad-leaved forest in Damingshan had changed significantly from semi spherical crown to cylindrical narrow-crown in order to adapte ice storm disturbance and climate change.关键词
冰冻灾害/干扰/常绿阔叶林/树冠/冠层状况Key words
ice storm damage/disturbance/evergreen broad-leaved forest/crown/canopy condi-tion分类
生物科学引用本文复制引用
温远光,李婉舒,朱宏光,周晓果,叶铎,王磊..特大冰冻干扰对大明山常绿阔叶林树冠及林冠层状况的影响[J].广西科学,2014,(5):454-462,9.基金项目
国家自然科学基金项目(39460022,30860059),国家科技支撑计划项目(2011BAC09B02)和广西重大专项计划项目(1222005)资助。 （39460022,30860059）
