| 江苏宝华山自然保护区紫楠群落基本特征 |
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| 引用本文： | 钮峥洋,张晓晨,祁奇,郗连连,陈昕.江苏宝华山自然保护区紫楠群落基本特征[J].浙江农林大学学报,2019,36(6):1134-1141. |
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| 作者姓名： | 钮峥洋 张晓晨 祁奇 郗连连 陈昕 |
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| 作者单位： | 1.南京林业大学 南方现代林业协同创新中心, 江苏 南京 2100372.南京林业大学 生物与环境学院, 江苏 南京 210037 |
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| 基金项目： | 江苏省林业局"绿色江苏"项目164108402第2次全国重点保护野生植物资源调查专项资金项目031010251 |
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| 摘 要： | 基于10个20 m×20 m的样方，对江苏宝华山重要森林组成树种紫楠Phoebe sheareri群落的基本特征进行了调查与分析。结果表明:①该群落共有维管植物59科100属120种，其中被子植物55科95属115种，蕨类植物4科5属5种；样地内种子植物区系类型在属的层面上以温带成分占优势，具有亚热带向暖温带过渡的特征。②群落垂直结构明显，乔木层以紫楠，枫香树Liquidambar formosana，青冈Cyclobalanopsis glauca，建始槭Acer henryi和红柴枝Meliosma oldhamii为主要优势种，其重要值依次为:29.69，10.34，8.61，7.83和6.12；灌木层仍以紫楠为主要优势种，重要值为34.00；草本层以安徽碎米荠Cardamine anhuiensis为第一优势种，重要值为10.52。③群落各频度级分布规律为A > B > E > D > C（A级种频度比例最小，一般指群落偶见种或稀有种，E级种频度比例最大，一般指群落优势种或建群种，B，C，D级为物种在不同频度区间的分布情况），表明群落较为稳定；由优势种群的年龄结构分析可见，常绿树种紫楠、青冈属增长型种群，落叶的枫香树、红柴枝为衰退型种群，建始槭为稳定型种群，表明该群落正处于发展中期。④由群落物种多样性指数可见群落整体的物种多样性水平较高，但功能多样性指数偏低，单寡种占据群落较大的生态位，群落内各物种对于全部资源利用率较低。综合分析结果显示:紫楠群落暂时表现稳定，但优势种群的种内竞争加剧了环境资源的压力，宜适当择伐群落内弱势个体并加强群落的就地保护。
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| 关 键 词： | 森林生态学 紫楠 群落特征 物种多样性 江苏宝华山 |
| 收稿时间： | 2018-12-18 |
Phoebe sheareri community in the Jiangsu Baohuashan Nature Reserve |
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| NIU Zhengyang,ZHANG Xiaochen,QI Qi,XI Lianlian,CHEN Xin.Phoebe sheareri community in the Jiangsu Baohuashan Nature Reserve[J].Journal of Zhejiang A&F University,2019,36(6):1134-1141. |
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| Authors: | NIU Zhengyang ZHANG Xiaochen QI Qi XI Lianlian CHEN Xin |
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| Institution: | 1.Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, Jiangsu, China2.College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, Jiangsu, China |
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| Abstract: | In order to protect local ecological resources contrapuntally, an important forest composition tree species Phoebe sheareri, its basic community characteristics was determined. Ten 20 m×20 m plots were delineated on the northern slope of Baohuashan in Jiangsu Province by the sampling method and then studied using plant community characteristics and diversity analysis. Results of this community showed that there were 120 species of vascular plants belonging to 100 genera of 59 families including 115 species of angiosperms belonging to 95 genera of 55 families and 5 species of pteridophytes belonging to 5 genera of 4 families. The floristic types of seed plants in the sample plots were dominant at the level of genera with the obvious characteristics of transition from subtropical to warm temperate components. Vertical structure of the community was clear, and the dominant species with their importance values were P. sheareri (29.69), Liquidambar formosana (10.34), Cyclobalanopsis glauca (8.61), Acer henryi (7.83), and Meliosma oldhamii (6.12). The dominant species in the shrub layer was P. sheareri, with an importance value of 34.00, and the dominant species in the herb layer was Cardamine anhuiensis with an importance value of 10.52. Distribution regularity of each frequency class for the community was A > B > E > D > C indicating a relatively stable community. Age structure analysis of the dominant population, showed that the evergreen species P. sheareri and C. glauca were growth-type populations, deciduous L. formosana and M. oldhamii were decline-type populations, and C. glauca was a stable-type population indicating that the community was in the middle stages of development. Community diversity indexes revealed an overall high level of community species diversity, but a low functional diversity. Single species occupied the larger niche of the community, and the effective resource utilization rate of each species in the community was low. Thus, the P. sheareri community was temporarily stable, but intra-species competition of dominant populations could subsequently aggravate pressure on environmental resources making it advisable to fell the disadvantaged trees and strengthen in-situ protection of the community. |
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