摘要
为阐明百山祖亮叶水青冈Fagus lucida的种群结构与格局的形成原因,掌握种群数量动态及发展趋势,在百山祖北坡建立1个5 hm2(250 m×200 m)固定样地,将样地划分成2 000个5 m×5 m的小样方进行调查,获得野外资料。对亮叶水青冈种群进行统计,绘制径级结构图,发现立木级1级和2级所占比例仅为4%,第4～9级处于峰值,表明种群内成熟个体数量所占比例最大(80%),种群处于成熟阶段,第10～14级则属于衰退级别,它们所占的比例并不大(13%);应用聚集强度指数(K)进行种群分布格局分析,亮叶水青冈除在小树期K=0.588较大外,其余K值在幼苗、中树,大树期分别为0.029,0.588,0.169,均较小。结果表明:亮叶水青冈种群结构呈纺锤型,幼苗严重不足,种群有衰退的趋势;幼苗、中树和大树阶段均为集群分布,聚集强度逐级降低,小树呈随机分布。分析认为,亮叶水青冈的种群结构和分布格局受到了多种因素的影响,如群落生境、亮叶水青冈生物学特性以及自然干扰等。
To study the structure and population dynamics of Fagus lucida, as well as its distribution pattern, the study was carried out in a 5 hm2 permanent plot established in the north slope of Baishanzu Nature Re serve, Zhejiang Province. Size structure and index of assembling intensity （K） were analyzed. Results at four teen growth stages, based on diameter at bright height （DBH）, showed that stages 1 and 2 comprised only 4% of all individuals, stages 4 to 9 made up 80%, and stages 10 to 13 accounts for 13%. Also, K for small trees （1.0 cm≤DBH〈7.5 cm） was 0.588, for seedlings （DBH〈1 cm） it was 0.029, for middlesized trees （7.5 cm≤ DBH〈22.5 cm） it was 0.143, and for large trees （DBH≥22.5 cm） it was 0.169. Thus, Fagus lucida popula tion structure was a spindletype with the population declining due to lack of see ; whereas K revealed that spatial distribution was random for small trees but clumped for seedlings, middlesized trees, and large trees, as a result decided mainly by interactions of biological and ecological properties like the intercompeti tion and density limitation, as well as environmental factors like drought and storm. [Ch, 1 fig. 2 tab. 37 ref.]
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2012年第5期647-654,共8页
Journal of Zhejiang A&F University
基金
中国科学院专项基金资助项目(SW04103)
关键词
森林生态学
亮叶水青冈
种群结构
分布格局
百山祖
forest ecology
Fagus lucida
population structure
distribution pattern
Baishanzu
