摘要
通过对茂兰自然保护区喀斯特森林中林隙和非林隙林分的调查,分析了茂兰喀斯特森林主要乔木树种和幼苗、幼树在林隙内外的数量特征以及灌木对林隙的更新反应规律,根据树种在林隙内外的重要值位序差值把茂兰喀斯特森林主要乔木树种大致划分为5种生态种组:①对林隙有强烈正更新反应的树种;②对林隙有强烈负更新反应的树种;③对林隙有中等正更新反应的树种;④对林隙有中等负更新反应的树种;⑤对林隙更新反应不显著的树种.不同生态种组树种的幼苗在林隙与非林隙斑块中的更新表现出显著的差别.每种灌木在林隙内的密度都非常明显地高于非林隙中,但林隙内大多数灌木的平均高度小于非林隙的.林隙内的树木以幼苗、幼树和小径木为主,中、大径木较少,林隙外的对照林分中虽然也有一定的幼苗幼树和小径木,但与林隙内相比,中、大径木所占的比例相对较高.林隙内的幼苗幼树以阳性树种为主,而中、大径木则以耐荫树种为主.
Based on an investigation in gaps and non-gap stands in the karst forest of Maolan Natural Reserve, Guizhou Province, the quantitative characteristics of tree species, saplings and seedlings in gaps and nongap stands, the regeneration responses of the shrub species to gaps were analyzed. The results showed that tree species were classified into 5 groups according to their changes of orders of importance values in gaps and nongap stands, i.e. ① strong positive regeneration response to gaps; ②strong negative regeneration response to gaps;③ moderate positive regeneration response to gaps;④ moderate negative regeneration response to gaps, and ⑤ non-significant regeneration response to gaps. Recruitment of the seedlings for the different ecological groups of species in gap patches differed from that in non-gap patches were found significantly. The density of every shrub in gaps was much higher than that in non-gap stands, but average height of most shrub in gaps were shorter than those in non-gap stands. The saplings, seedlings and small diameter trees were much but large and middle diameter trees were less in gaps. Although it also had some saplings, seedlings and small diameter trees in non-gap stands,but the percentage of large and middle diameter trees were much more in non-gap stands to compare with those in gaps. The saplings and seedlings were mainly light demanding trees, middle and large diameter trees were mainly shade tolerant trees in gaps.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第3期317-323,共7页
Journal of Yunnan University(Natural Sciences Edition)
基金
贵州省教育厅自然科学基金资助项目(黔教科2001028)
贵州师范大学博士基金资助
关键词
喀斯特森林
林隙
更新
数量特征
karst forest
gap
regeneration
quantitative characteristics
