普洱季风常绿阔叶林次生演替中木本植物幼苗更新特征

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 普洱季风常绿阔叶林次生演替中木本植物幼苗更新特征 DOI: 10.5846/stxb201108101174 作者: 作者单位: 中国林业科学研究院资源昆虫研究所,中国林业科学研究院资源昆虫研究所,中国林业科学研究院资源昆虫研究所,中国林业科学研究院资源昆虫研究所,普洱市林业科学研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金资助项目(CAFYBB2008001, riricaf 201002M) Woody seedling regeneration in secondary succession of monsoon broad-leaved evergreen forest in Puer, Yunnan, Southwest China Author: Affiliation: Research Institute of Resource Insects,Chinese Academy of Forestry,Research Institute of Resource Insects,Chinese Academy of Forestry,Research Institute of Resource Insects,Chinese Academy of Forestry,Research Institute of Resource Insects,Chinese Academy of Forestry,Forestry Research Institute of Pu''er Municipality Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:以时空替代的方法,将针阔混交林、季风常绿阔叶林的次生林与成熟林等3个处于同一空间下的群落作为次生演替进程中的3个阶段,研究云南普洱地区次生演替过程中的木本植物幼苗更新特征,分析了次生演替过程中木本植物幼苗的物种组成、密度、高度级及与环境因子的相关性。结果表明:在8个共144 m2的幼苗样地中调查木本植物幼苗101种2014株,其中乔木幼苗是主要组成。随着次生演替的进行,木本植物幼苗、乔木与藤本幼苗密度逐渐增加,灌木幼苗密度无显著变化;藤本植物幼苗的物种丰富度随着次生演替进行而增加,乔木与灌木幼苗则无显著变化,成熟季风常绿阔叶林中木本植物幼苗Shannon-Wiener指数要显著小于针阔混交林与次生季风常绿阔叶林。次生与成熟季风常绿阔叶林木本植物幼苗多度随高度级增加而减少,针阔混交林则呈现偏峰曲线,幼苗密度均集中分布在高度20 cm以内,3个群落演替阶段木本植物幼苗物种丰富度随高度级增加呈现偏锋曲线。相似性系数反映出乔木和藤本幼苗的更新来源与群落的物种组成存在着紧密的联系。乔木幼苗密度分布与样地坡度之间存在着显著的负相关,灌木幼苗密度与土壤pH值之间存在着显著正相关。 Abstract:Seedling, made up of small individuals of woody plant species in the understorey, is an important component of many forests and considered as an important source for natural restoration in forest ecosystems. Simultaneously seedling plays an important role in the regeneration of numerous tree species. Based on space-for-time substitution method, we treated coniferous and broad-leaved mixed forest, secondary monsoon evergreen broad-leaved forest (MEBF), primary MEBF in the same area as three different stages of secondary succession of MEBF. Eight sampling plots representing the three different stages distribute in Caiyanghe nature reserve, surrounding the areas of Meizihu and Xinfang reservoir of Puer, in Yunnan Province, the southwest of China. We investigated seedling regeneration characteristics of woody plants of MEBF during secondary succession by looking at species composition, density, height level and the relationship with environmental factors. Overall, we found 2014 individuals of woody seedlings belonging to 101 species (dominated by understory tree species) in the eight plots covering 144-m2 area. The species richness of tree seedling, shrub seedling and liana seedling were 50, 29 and 22 respectively, and their corresponding individuals were 1499, 299 and 216. Tree seedling was the main component of woody plant seedling, such as Castanopsis echidnocarpa. Pinus kesiya var. langbianensis are dominant species in coniferous and broad-leaved mixed forest, however, their seedlings rarely appeared in the understory. The pine seedling stages need more light than shade-tolerant species which can conserve seedling bank in understory and waited for appropriate chance to regeneration. The woody plant seedling density of coniferous and broad-leaved mixed forest, secondary and mature MEBF was 183±5.69, 240±20.31 and 372.5±4.5 individuals per 18m2. As succession progresses, the density of total woody seedlings, tree seedlings and liana seedlings all increased, while the density of shrub seedlings did not change significantly. Celastrus virens as a liana was particularly conspicuous in mature MEBF. Species richness of liana seedlings tended to increase, while species richness of tree seedlings and shrub seedlings remained relatively stable along the succession gradient. The Shannon-Wiener index of woody seedlings was significantly lower in primary MEBF than those in mixed forest and secondary MEBF. The abundance of woody seedlings in secondary and primary MEBF decreased with the increase of height level, while in mixed forest, the abundance of woody seedlings form a unimodal pattern with peak at 20 cm. Species richness, however, showed consistent (increasing or decreasing) pattern with the increase of height level in all these forest types. Distribution of woody seedlings abundance concentrated in 0-20 cm in the three community types. Woody seedlings species richness of mature MEBF was significantly lower than coniferous and broad-leaved mixed forest when height level was at Ⅰand Ⅱ. Sørensen index indicated a close link between tree and liana seedlings and the species composition of the community. Moreover, tree seedling density distribution was significantly negatively correlated with the slope of the plot, while shrub seedling density was significantly positively related to soil pH. 参考文献 相似文献 引证文献