粤北地区3种不同人工林林下植物多样性研究-广东林业科技.DOC

广东山区3种不同人工林林下植物多样性初步研究* 李清湖1,2，庄雪影1,# （1.华南农业大学林学院，广东 广州510642；2.广东省林业调查规划院，广东 广州 510520） 摘要：人工林林下植物多样性发展有利于提高人工林地力、维持群落健康和提高生态系统的稳定性。应用样方调查法，比较研究了广东山区马尾松林、湿地松林和杉木林等3种人工针叶林群落的林下植物多样性。研究结果表明，杉木林的林下植物丰富度较高，共记录了136种林下植物种类；马尾松林次之，林下植物共有132种；湿地松林的林下植物种类最少，仅53种。物种多样性指数总的变化趋势为杉木林马尾松林湿地松林。3种人工林群落之间的相似性系数均较低，表明这些人工林群落的林下植物种类差异明显。基于以上研究结果，探讨了影响人工林植物多样性的主要因素和提高人工林植物多样性的途径。 关键词：人工林；林下植物；物种多样性；广东山区 Preliminary Study on Understory Species Diversity of Three Types of Plantations in Mountainous Area of Guangdong Li Qinghu1,2，Zhuang Xueying1,# （1. College of Forestry, South China Agricultural University, Guangzhou Guangdong 510642, China; 2. Forestry Inventory and Planning Institute of Guangdong Province, Guangzhou Guangdong 510520, China） The undergrowth species diversity can enhance the site productivity of timber plantations, health of communities and stability of forest ecosystem. The undergrowth species diversity of three plantation types, Pinus massoniana plantation, P. elliottii plantation and Cunninghamia lanceolata plantation in mountainous area of Guangdong were studied by plot investigation. The results showed that the undergrowth species were the richest in C. lanceolata plantation（136 species）, next to that of P. massoniana plantation（132 species）, and the least was in P. elliottii plantation（only 53 species）. The species diversity indices for three plantation types was C. lanceolata plantation P. massoniana plantation P. elliottii plantation. The similarity coefficient between three different types of plantations was low, which showed that species in the understory were significantly different among those plantations. Furthermore, the major factors influencing the floristic diversity of the plantations and different measures to improve the species diversity of plantations were also discussed. Key words：plantations: understory: species diversity: mountainous area of Guangdong 随着城市化进程的迅速发展，天然植被面积急剧减少，我国南方地区在过去几十年间通过营造人工林有效地促进了自然植被的恢复，并改善了生态环境。，， 1 研究地概况 广东山区主要是指南起北纬约