古田山茶湾样地甜槠-木荷林根萌特征分析

Characteristics of root sprouting trees of Castanopsis eyrei and Schima superba communities in 1 hm^2 forest plot at Chawan,Gutianshan National Nature Reserve

根萌是植物营养繁殖的重要策略之一,森林植物的根萌现象影响着植物群落的更新动态和演替方向.在对古田山茶湾1hm2固定样地胸径≥1cm的木本植物调查的基础上,分析了该样地木本植物的根萌现状及根萌与母树的相关性,结果表明:样地内根萌植物共有68种,隶属于48属26科,占群落总物种的67.3%.其中根萌萌生能力较强的物种有林冠层中的石栎(Lithocarpus glaber)、甜槠(Castanopsis eyrei)、木荷(Schima superba),亚乔木层中的灰白蜡瓣花(Corylopsis glandulifera)、隔药柃(Eurya muricata)、浙江红花油茶(Camellia checkiangoleosa),灌木层中的窄基红褐柃(Eurya rubiginosa)、宜昌荚蒾(Vibernum erosum)、映山红(Rhododendron simsii);对优势根萌物种和母树的相关性分析表明:考虑根萌因素后,各物种重要值发生小幅度增减,但各垂直层次的优势种排名次序基本不变;乔冠层物种在母树Ⅰ~Ⅲ级生长阶段、亚乔木层和灌木层物种在母树Ⅰ~Ⅱ级生长阶段均表现出根萌能力逐渐增强的趋势,在其他生长阶段,不同物种表现出不同的变化趋势;优势根萌物种在样地中的分布与样地内相关母树的分布情况基本吻合,多数根萌物种的分布表现出聚集现象.

As an important plant vegetative reproduction strategy, root sprout might influence forest regeneration and succession in a large scale. In this study, we analyzed the root sprout trees and their relationships withmother trees based on the investigated data of all the free standing trees≥1 cm DBH （diameter at 1.3 m above ground ） in Chawan 1 hm^2 forest plot （Chawan plot） in Gutianshan National Nature Reserve, Zhejiang Province. The results showed that 68species （67.3%of the total species） had the sprout phenomenon, belonging to 48 genera, 26 families. Lithocarpus glaber, Castanopsis eyrei and Schima superba had the stronger capability of sprout in canopy layer. Corylopsis glandulifera, Eurya muricata and Camellia checkiangoleosa had the stronger capability of sprout in subcanopy layer and Eurya rubiginosa Var. attenuata, Vibernum erosum and Rhododendron simsii had the stronger capability of sprout in shrub layer. The result of correlation analysis between the dominant root sprout trees and their mother trees showed that species importance value in each vertical layer didn＇t change obviously whether root sprouts were included or not. Besides, the root sprouting capability of species increased from I to Ⅲ growth stages in canopy layer, and the species increased from I to Ⅱ growth stages in sub-canopy and shrub layer. Furthermore, the distribution situation of the dominant root sprout trees was largely similar to the corresponding mother trees in Chawan plot and many species owned root sprouts were spatially clustered.