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桉树工业人工林植物物种多样性及动态研究 预览 被引量:104

Plant diversity and dynamics in industrial plantations of eucalyptus
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摘要 以定位监测与时空互代相结合的方法,于1998-2003年,从不同连栽代数、层次的物种丰富度、均匀度和物种多样性指数等方面对桉树工业人工林群落的物种多样性及动态进行了研究.结果表明:①从1998-2003年,第1代林分出现的物种数为78种,第2代林分只有39种,第2代林分出现的物种数比第1代减少了50%;以达到主伐时的林分监测结果比较,第2代林分的物种丰富度、Shannon-Wiener指数和Simpson指数分别比第1代林分下降39.39%、17.76%和5.45%.②在1个经营周期(6 a)内,桉树工业人工林的物种丰富度呈先快速增加,后稍下降,再增加的'S型'变化;Shannon-Wiener指数和Simpson指数呈先快后慢的逐渐递增趋势;由于在1个经营周期内,物种的恢复总是达不到原有(第1代)的水平,因此,连栽和短轮伐期经营必然导致物种多样性的降低.③灌木层的物种丰富度和多样性指数普遍高于草本层,连栽具有降低灌木层物种丰富度和多样性指数,提高草本层物种丰富度和多样性指数的作用. The species richness, evenness and species diversity of plants in industrial plantations of eucalyptus were studied during 6 years from 1998 to 2003, using the methods of “time specific” and “fixed position monitoring”. The main results are as follows: 1 ) Seventy-eight species of plants appeared in the first generation stand and 39 species in the second from 1998 to 2003. The species number in the second generation stand was 50 % lower than that of the first. The species richness, Shannon-Wiener index and Simpson index of the second generation stand decreased by 39.39%, 17.76% and 5.45% compared with those of the first. 2) The species richness of the industrial plantations of eucalyptus showed a “S-type” change from 1998 to 2003, and Shannon-Wiener index and Simpson index both increased with the increase of stand age, but the early increase speed was faster than the later one. The continuous cropping and short-term management will reduce the diversity because the species recovery cannot reach the primary diversity level in a management period. 3) The species richness and species diversity index of shrub layer are obviously higher than those of herb layer. But continuous cropping has effects on reducing species richness and species diversity index of shrub layer and improving those of herb layer.
作者 温远光 刘世荣 陈放 和太平 梁宏温 陈婷 Wen YuanGuang;Liu ShiRong;Chen Fang;He TaiPing;Liang HongWen;Chen Ting
出处 《北京林业大学学报》 CAS CSCD 北大核心 2005年第4期 17-22,共6页 Journal of Beijing Forestry University
基金 国家重点基础研究发展计划(973计划)
关键词 桉树 工业人工林 植物 物种多样性 动态 eucalyptus, industrial plantation, plant, species diversity, dynamics
作者简介 温远光,博士生,研究员.主要研究方向:森林生态学、森林培育学、森林水文学.电话:0771—3271858 Email:wenyg@263.net地址:530005南宁市秀灵路73号广西大学林学院.
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