摘要
通过对冀北山地退化华北落叶松人工林52个林隙的调查,研究了林分的林隙特征和实施封禁后林隙开敞度对林下更新的影响。研究区域林隙分布广泛,且大多数林隙的开敞度较小。封禁3年后,天然更新密度显著提高,树种多样性增加;但更新密度仍然很低,更新群落主要由华北落叶松和山杨组成。总体上,封禁后林隙内更新密度高于林冠下,在开敞度为0.5～0.6的林隙内更新密度最大,华北落叶松和山杨分别在开敞度0.4～0.5和0.7～0.8的林隙内生长状况最好。人工栽植的油松和樟子松分别在开敞度0.4～0.6的林隙中央和开敞度0.6～0.8的林隙边缘生长最好。随时间延长林隙和林隙内位置对人工更新高生长的存进作用趋于明显。单纯封禁促进了天然更新,但作用有限,因此人工更新很有必要。
Based on the investigation on 52 gaps in degraded Larix pricipis–rupprechtii plantation in mountainous region of northern Hebei province,the gap characteristics of forest and effects of opening degree on natural recruitment after closing measures were studied. The results show that in studied area,the gaps widely distributed and most gaps had smaller opening degree; three years after the closed forest project,the recruit density and species diversity increased obviously,but the density was still low and the recruitment community was mainly composed of L. pricipis–rupprechtii and Populus davidiana; in general,after closed the recruit density in the gaps were higher than that under the canopy; in the gaps of 0.5～0.6 opening degree the recruit density were the highest,L. pricipis–rupprechtii and Populus davidiana grew best in gaps of 0.4～0.5 and 0.7～0.8 opening degree respectively; Artificial planted Pinus tabulaeformis and Pinus sylvestris var. mongolica grew best at the gaps center of 0.4～0.6 opening degree and gaps edge of 0.6～0.8 opening degree respectively; With the extension of closed forest time,the effects of gaps and position in gaps on artificial regeneration seedlings＇ growth became more obviously. The closed forest project promoted the natural recruitment,but the effect was limited,so it is necessary to recruit by human.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2014年第8期1-8,共8页
Journal of Central South University of Forestry & Technology
基金
国家公益专项“燕山山地典型森林类型健康经营技术”(20100400205)
科技部十二五科技支撑项目“华北土石山区典型森林类型可持续经营技术研究”(2012BAD22B03)
关键词
华北落叶松
退化
近自然经营
封禁
林隙特征
更新
Larix pricipis-rupprechtii plantation degraded
close-nature management measure
closed forest project
gap characteristics
effect of artificial regeneration
