东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

南京朴树林竞争强度及其群落稳定性

ISSN号：1673-4831
期刊名称：《生态与农村环境学报》
时间：0
分类：Q948[生物学—植物学] S718.5[农业科学—林学]
作者机构：[1]南京师范大学生命科学学院/江苏省生物多样性与生物技术重点实验室,江苏南京210023
相关基金：基金项目：环保公益性行业科研专项（201009033）;国家基础科学人才培养基金（J1103507）;江苏高校优势学科建设工程项目（164320H1067）

关键词：朴树林, 竞争强度, 群落稳定性, 南京, Celtis sinensis forest, competition intensity, community stability, Nanjing

中文摘要：

选择南京紫金山和老山国家森林公园的朴树林为研究对象，采用Phylomatic和PhyloCom软件构建主要竞争种的系统发育树，并利用Hegyi单木竞争指数模型分别对两地朴树的种内和种间竞争强度进行研究，同时采用改进的M．Godron稳定性测定方法分析群落稳定性。结果表明，朴树受到的种内竞争强度随着林木径级的增大而逐渐减小。紫金山和老山朴树林种内与种间竞争强度由大到小分别依次为麻栎、朴树（种内竞争）、刺槐、毛楝和三角枫以及构树、朴树（种内竞争）、黄檀、刺槐和化香。南京紫金山和老山两地朴树的种内竞争强度均小于种间，这可能与朴树林中优势树种的生物学特性、生境异质性及系统发育相关。两地竞争强度与对象木胸径的关系均符合幂函数关系，当朴树的胸径≥20cm时，竞争强度变化很小，所得模型能很好地预测朴树种内与种间的竞争强度。研究结果表明南京紫金山和老山两地的朴树林均处于不稳定状态。

英文摘要：

Intraspeeific and interspecific competition intensities of the Celtis sinensis stands from Laoshan National Forest Park and Zijin Mountain in Nanjing, Jiangsu were quantitatively analyzed using Hegyi＇s single-tree competition index mod- el. Phylogenetic trees of the main tree species involved in the competition were constructed with the Phylomatic and Phylo- Com. Meanwhile the modified M. Godron method was applied to analyze cmnmunity stability of the C. sinensis stands. Re- suits show that the intraspecific competition intensity of the C. sinensis trees decreases gradually with the trees growing and rising in diameter at breast height （DBH） class. C. sinettsis competes with other trees in the forest, showing a decreasing order of Quercus acutissima 〉 C. sinensis 〉 Robinia pseudoacacia 〉 Comus walteri 〉 Quercus variabilis in Zijin and of Broussonetia papyrifera 〉 C. sinensis 〉 Dalbergia hupeana 〉 Robinia pseudoacacia 〉 Platycarya strobilacea in Laoshan in competition intensity. No matter whether in Zijin or in Laoshan, the intraspecific competition is lower than the interspe- cific competition, which may be related to the biological characteristics, habitat heterogeneity and phylogeny of the domi- nant species of the forests. A power function relationship is found conforming to the one between competition intensity and DBH of the objective trees. When C. sinensis grows over 20 cm in DBH, its competition intensity changes little, so the model can be used to predict efficiently intraspecific and interspecific competition intensity within the forest. The analysis of community stability using the modified M. Godron method indicates that the C. sinensis stands, in both Zijin and Laos- ban are still in an unstable state.