冰雪灾害对江西九连山常绿阔叶林的影响

摘要

以江西九连山国家自然保护区常绿阔叶林为对象，研究林分不同层次优势种受灾程度，分析物种海拔、坡度对受灾程度的影响.结果表明：乔木上层和中层树木以断稍为主，乔木下层树木以断稍和腰折为主，小树和幼树以压弯为主.在平均受损指数MDI (Mean Damage Index)方面，乔木上层米槠MDI 值最高，拟赤杨最低；乔木中层鸭公树MDI 值最高，浙江新木姜子最低；乔木下层米槠MDI 值最高，浙江新木姜子最低；小树米槠MDI 值最高，细枝柃最低；幼树二列叶柃MDI 值最高，狗骨柴最低.海拔对不同林分层次树木的部分受损指标有显著影响(P＜0．05)；整体上，不同林分层次树木的受损指标在700~760 m 海拔生境高于640~700 m海拔生境.不同坡度生境下树木的受损指标均无显著差异(P＞0．05).%The ice and snow damage to the evergreen broad-leaved forest of Jiulianshan Mountain National Natural Reserve in Jiangxi Province was studied,and effects of altitude,slope on the damage degree were analyzed.The results were as follows:the upper-layer and mid-layer trees were mostly in model of top breakage,the under-layer trees were subj ected to top and trunk breakage,the saplings and seedlings were mostly suffered from bending.In term of MDI , seedlings0.05).