微生境对辽东栎幼苗生长的影响  

Effects of Microhabitat on the Growth of Quercus wutaishanica Seedlings

作　　者：郑维娜[1] 王孝安[1] 郭华[1] 王丹[1] 刘鹏[1] 刘史力[1] 

机构地区：[1]陕西师范大学生命科学学院,陕西西安710062

出　　处：《干旱区研究》2013年第6期1049-1055,共7页Arid Zone Research

基　　金：陕西师范大学优秀科技预研项目(201002001)

摘　　要：以早期辽东栎（Quercus wutaishanica）实生幼苗个体为研究对象,探讨影响辽东栎幼苗生长的关键微生境因子。采用典型样线调查法,对子午岭马栏林区1~3龄的辽东栎实生幼苗的生长指标和幼苗所处的微生境变量进行了调查分析。结果表明：3龄幼苗的株高、基径、芽数目与1、2龄幼苗有显著性差异,随着龄级的增长幼苗的生长率逐渐降低,影响幼苗生长的微生境变量呈增加趋势,对微生境做出响应的生长指标也呈增加趋势,暗示着微生境对幼苗生长的影响具有时滞效应。枯落物是限制幼苗生长的重要因素之一,乔木层的适度遮荫是1、2龄幼苗生长的最佳光照环境,3龄幼苗生长的最佳环境则是林隙,可见辽东栎幼苗要成功定居必须等待林窗的出现。In this paper,Quercus wutaishanica seedlings were selected as the research object to elucidate the effect of microhabitat on the growth of the seedlings. In the Q. wutaishanica forest in Malan forest zone on the Mt.Ziwuling,the growth parameters of 1- 3-year-old Q. wutaishanica seedlings and the microhabitat variables were studied by using the typical line transect method and laboratory test. The results showed that the height,stem base diameter,bud number of seedlings of 3-year-old seedlings were significantly different from those of 1-year-old and 2-year-old seedlings. Along with the increase of seedling age,the seedling growth rate reduced gradually,and the microhabitat variables and the growth parameters of seedlings were in an increase trend,which revealed that there was a time lag in the effects of microhabitat on the growth of seedlings. Litters are one of the important factors of restricting seedling growth,a suitable shade of tree layer is an optimal environment for the growth of 1-year-old and 2-year-old seedlings,and the optimal environment for the growth of 3-year-old seedlings is gap. Therefore,gap is necessary for the ecesis of Q. wutaishanica.

关 键 词：早期幼苗 微生境 辽东栎(Quercus wutaishanica) 时滞效应 林隙 枯落物 

分 类 号：S792.18[农业科学—林木遗传育种]