大兴安岭南段山杨死亡对其更新的影响  

Effect of Populus davidiana Death on Its Regeneration in the Southern Daxing’an Mountains

作　　者：赵鹏武[1] 刘兵兵 管立娟 周梅[1] 舒洋[1] Zhao Pengwu;Liu Bingbing;Guan Lijuan;Zhou Mei;Shu Yang(Inner Mongolia Saihanwula National Forest Ecosystem Research Station,Inner Mongolia Agricultural University,Hohhot 010019,P.R.China)

机构地区：[1]内蒙古赛罕乌拉森林生态系统国家定位观测研究站(内蒙古农业大学),呼和浩特010019

出　　处：《东北林业大学学报》2021年第7期33-36,55,共5页Journal of Northeast Forestry University

基　　金：中央引导地方科技发展资金项目(2020ZY0024);国家自然科学基金项目(41861005);内蒙古自然科学基金面上项目(2020MS04011)。

摘　　要：以内蒙古大兴安岭南段山杨林为研究对象,根据对照样地、山杨中度死亡样地和山杨重度死亡样地的不同死亡梯度的调查数据,分析山杨死亡后更新情况。结果表明:山杨重度死亡样地的山杨更新密度最大,更新密度为7 308.33株/hm^(2),更新密度分别是山杨中度死亡样地、对照样地的2.55、17.20倍;山杨重度死亡样地更新幼苗(树)平均树高最大,平均树高为3.71 m,更新幼苗(树)平均胸径最大,平均胸径为3.05 cm。山杨重度死亡样地和山杨中度死亡样地与对照样地的更新密度、平均胸径和平均树高差异均显著(P<0.05);更新密度、平均树高和平均胸径与郁闭度和林分密度呈显著负相关(P<0.05);幼苗枯梢率与郁闭度及林分密度呈显著正相关(P<0.05);幼苗死亡率及幼树枯梢和死亡率与更新密度和郁闭度呈显著负相关(P<0.05)。总体而言,大兴安岭南段山杨林在气候变化的干旱背景下,具有强大的萌蘖更新能力,更新苗在森林死亡后生长良好,幼苗拥有成材的潜力。With Populus davidiana forests in the southern section of the Daxing’an Mountains in Inner Mongolia,we studied the post-mortality regeneration of sagebrush with the survey data from different mortality gradients in control,moderate and heavy mortality sample plots.The P.davidiana regeneration density in the heavily mortality plots is the highest,with a regeneration density of 7308.33 ind./hm^(2),which is 2.55 and 17.20 times higher than that of the moderately mortality plots and the control plots,respectively.The mean height of the renewed seedlings(trees)in the heavy mortality plots of mountain poplar was the highest(3.71 m).The mean diameter at breast height of the renewed seedlings(trees)in the heavily mortality plots of mountain poplar was the largest(3.05 cm).Significant differences(P<0.05)in regeneration density,mean diameter at breast height and mean tree height between poplar heavy mortality plots and poplar moderate mortality plots and control plots;regeneration density,mean tree height and mean diameter at breast height were negatively and significantly correlated with depression and stand density(P<0.05).Seedling dieback rate was significantly and positively correlated with depression and stand density(P<0.05).Seedling mortality and young tree dieback and mortality were negatively and significantly correlated with regeneration density and depression(P<0.05).In general,the P.davidiana forests in the southern section of the Daxing’an Mountains have a strong capacity for sprouting and regeneration under the climate change drought and theseedlings grow well after forest die-off,and theseedlings have the potential to grow into large trees or continue the forest for the next generation.

关 键 词：大兴安岭 次生林 山杨死亡 更新特征 环境因子 

分 类 号：S719[农业科学—林学]