摘要
为了探讨柴松(Pinus tabulaeformis f.shekannesis)群落优势种群的更新特点及其不同林型对优势种群更新机制的影响,笔者采用样方法调查了黄土高原柴松群落(柴松纯林及柴松-辽东栎(Quercuswutaishanica)混交林)内柴松及辽东栎种群的径级结构和幼苗数量,分析了种群及幼苗的更新动态、幼苗的死亡率和原因。结果表明:纯林和混交林内柴松以及纯林内辽东栎种群及幼苗大小结构整体上都呈反"J"字型,表明种群为增长型种群。而混交林内辽东栎为成熟性种群;混交林内的环境条件更适于柴松幼苗的初期生长,而柴松幼苗后期生长在纯林内较好。柴松幼苗密度在各群落类型中均低于辽东栎,且数量较少。根据幼苗的数量及生长趋势来看,柴松林下更适宜于辽东栎幼苗的生长。
To discuss the regeneration characteristic of the dominant populations and different forest types’ influences on them,a systematic study on populations structure ofPinus tabulaeformis f.shekannesis and Quercus wutaishanica,as well as seedlings quantity inPinus tabulaeformis f.shekannesis community on loess plateau were accomplished by using quadrat sampling method.The regeneration dynamics of populations and seedlings,the mortality and causes of seedlings were analyzed.The results showed that populations and seedlings of P.tabulaeformis f.shekannesis in pure and mixed forest,as well as Quercus wutaishanica population in pure forest appeared to distribute in an inversed‘J’shape,which indicated they were developing populations.Quercus wutaishanica in mixed forest was a grown up population,environmental conditions in the mixed forest were more suitable for the earlier seedlings but less for later growth.The density of P.tabulaeformis f.shekannesis seedlings was lower than that of Q.liaotungensis,the seedling bank of P.tabulaeformis f.shekannesis population in this area was also poor.Comparatively,P.tabulaeformis f.shekannesis population might be more suitable for the growth of Quercus wutaishanica.
出处
《中国农学通报》
CSCD
北大核心
2011年第8期7-12,共6页
Chinese Agricultural Science Bulletin
基金
国家重点基础研究与发展规划资助项目"973"项目(2002CB111505)
关键词
柴松群落
种群更新
幼苗
大小结构
死亡率
P.tabulaeformis f.shekannesis community
regeneration
seedling
size structure
the mortality
