摘要
在粤北地区选择不同林龄阶段(23、32、43、66 a)砍伐后飞播造林形成的马尾松(Pinus massoniana)阔叶混交林设立植物样地,开展野外调查研究了群落的物种组成和多样性。结果表明:马尾松在各林龄阶段乔木层均占据主要优势,其重要值随林龄增加先降低后升高。林龄23 a和32 a的阔叶树种以木荷(Schima superba)、甜槠(Castanopsis eyrei)、广东润楠(Machilus kwangtungensis)等常绿阔叶树种为主,林龄43 a和66 a的阔叶树种以鼠刺(Itea chinensis)、山茶(Camellia japonica)等低矮耐阴树种为主。马尾松早期促进了森林恢复和群落演替,后期则存在抑制作用。不同林龄阶段乔木层和草本层的物种丰富度指数、多样性指数和均匀度指数均表现出随林龄增加而降低的趋势,灌木层则表现出随林龄增加先降低后升高的趋势。
The mixed forests of Pinus massoniana and broadleaf trees with different ages(23、32、43 and 66 years)formed by flying sowing after logging were selected in North Guangdong for establishing plant plots,and species composition and diversity were studied by filed investigation.The results showed that P.massoniana dominated at all forest ages in tree layer,and its importance value firstly decrease and then increase with the increasing of the forest age.The dominant species were broadleaf species such as Schima superba,Castanopsis eyrei and Machilus kwangtungensis in 23 and 32 years old forests,and low shade tolerance species such as Itea chinensis and Camellia japonica in 43 and 66 years old forests.The forest reserve and community succession were promoted in early stage and inhibited in later stage by P.massoniana.The indices of species richness,biodiversity and evenness in tree layer and herbaceous layer decrease with the increasing of forest age,it firstly decrease and then increase with the increasing of forest age in shrub layer.
作者
沈孝清
周光益
赵厚本
邹滨
SHEN Xiaoqing;ZHOU Guangyi;ZHAO Houben;Zou Bin(Administration Bureau of Yangdong Mountain Shierdushui Nature Reserve,Lechang,Guangdong 512219 China;Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou,Guangdong 510520 China;Administration Bureau of Dayao Mountain Nature Reserve,Lechang,Guangdong 512200 China)
出处
《林业与环境科学》
2018年第4期1-7,共7页
Forestry and Environmental Science
基金
中央级公益性科研院所基本科研业务费专项(RITFYWZX201504
CAFYBB2017ZX002-3)
南岭北江源森林生态系统国家定位观测研究站
关键词
针阔混交林
林龄
群落结构
生物多样性
coniferous and broad-leaved mixed forest
forest age
community structure
biodiversity
