浙江省不同演替阶段的低海拔次生林植物功能群结构的比较研究

选取浙江省低海拔地区的16个次生林样地并调查其中胸径（DBH）≥1 cm的木本植物.通过观察群落外貌，结合数量分类方法（TWINSPAN）和排序方法（DCA），将这些样地划分为4种演替阶段的森林类型（马尾松林，马尾松针阔叶混交林，演替早期常绿阔叶林，演替中期常绿阔叶林）.分析了不同演替阶段的次生林群落物种多样性和植物功能群结构组成变化.结果显示：（1） 适度择伐进入采伐期的马尾松可加速整个群落向常绿阔叶林演替；（2） 随着演替的进行，物种丰富度、Shannon Wiener指数、Simpson指数和Pielou均匀度指数均呈现增加趋势；（3） 按生活型、生长型、叶的生活期和对光的耐受性这4种功能群划分，所有样地分别以小高位芽植物和中高位芽植物、乔木和灌木或小乔木、常绿植物和耐阴植物占优；（4） 随着演替的进行，功能群结构比例呈现先降后升再降的是矮高位芽植物，先降后升的为小高位芽植物，呈现先升后降的为大高位芽植物、灌木、乔木、小乔木、常绿植物、阴性植物呈现上升趋势，落叶植物和阳性植物呈现下降趋势，而中高位芽植物、灌木或小乔木、耐阴植物则维持相对恒定的比例.

Comparative research of the structures of plant functional groups in different successional stages of lowland secondary forests in Zhejiang Province

All woody plants with DBH≥1 cm of 16 lowland secondary forest plots in Zhejiang Province were studied in this research. These plots are classified into four groups with different successional stages （Masson Pine forest, Masson Pine-broad-leaved mixed forest,early evergreen broad-leaved forest, medium evergreen broad-leaved forest） by observing the forest appearance, and the quantitative classification method TWINSPAN, as well as the DCA ordination. Species diversity and structure of plant functional groups in these plots along the gradient of secondary succession were analyzed. The result shows that：（1） Suitable selective logging for Pinus massoniana can accelerate the succession from pine forest to the evergreen broad-leaved forests （2） Species richness, Shannon-Wiener index, Simpson index and Pielou evenness index increase along with the successions （3） Meso-phanerophytes and micro-phanerophytes are dominated within life form category, tree and shrub or small tree are dominated within growth form category, evergreen plant are dominated within leaf phenology category, and shade-enduring plant is dominated within shade tolerance categorys （4） proportion of plant functional groups changes along with the succession as follows：nano-phanerophytes decrease first, then increase and decrease finally; micro-phanerophytes perform an U-shaped trends mega-phanerophytes and shrub perform an unimodal trends tree, small tree, evergreen plant and sciophyte increase; deciduous plant and heliophyte decreases while meso-phanerophytes, shrub or small tree and shade-enduring plant remain relatively constant.