生态学杂志2013，Vol.32Issue(4)：825-831,7.
喀斯特季节性雨林蚬木种群结构和数量动态
Age structure and quantitative dynamics of Excentrodendron hsienmu population in a karst seasonal rain forest in South China
摘要
Abstract
Excentrodendron hsienmu is a characteristic species in karst seasonal rain forest, and thus, to study the age structure and survival status of E. hsienmu population can provide insight into the succession process and status of karst seasonal rain forest. Based on the investigation data from a 15 hm2 plot in a karst seasonal rain forest at Nonggang of South China, and by using quantitative analysis method, this paper studied the age structure and quantitative dynamics of E. hsienmu population in the forest. In the forest, E. hsienmu population was characterized by the abundance of young individuals, and the age structure of the population was in an inverse-J shape. The survival curve of the population could be described by the Deevy Ⅱ curve and Deevy Ⅲ curve, but more appropriately by Deevy Ⅱ curve, which implied that E. hsienmu reproduced a large number of offspring to maintain its population. There existed two peak phases of mortality rate in the population lifespan, i. e. , 0-9 and 60-69 years. The survivability of the population had the characteristics of fluctuated at young age, stable at middle age, and decline at old age. The quantitative dynamics of the population had no obvious large cycle fluctuation, but a small cycle (about 11 years) fluctuation. In conclusion, the E. hsienmu population in the karst seasonal rain forest was of an expanding structure, and the survival status of the population fluctuated across different life stages, with a relatively high mortality rate at young and mature stages. The age structure and quantitative dynamics of the population could be greatly affected by the biological characteristics of the population itself and by the restrictive effect of negative density as well as the karst geological drought.关键词
蚬木/种群/生命表/存活曲线/谱分析Key words
Excentrodendron hsienmu/ population/ life table/ survival curve/ spectral analysis分类
农业科技引用本文复制引用
向悟生,王斌,丁涛,黄俞淞,农重刚,刘晟源,李先琨..喀斯特季节性雨林蚬木种群结构和数量动态[J].生态学杂志,2013,32(4):825-831,7.基金项目
国家自然科学基金项目(31270469)、国家科技支撑计划项目(2011BAC09B02)、广西自然科学基金项目(桂科自0991226)、广西"新世纪十百千人才工程"专项(2007219)和广西植物研究所基本科研业务费项目(桂植业09021、10007、11001)资助. （31270469）
