摘要
基于七姊妹山自然保护区内6 hm^2监测样地多度数据,通过累计经验分布曲线(ECDF)表征该样地内不同生活型功能群的物种-多度分布格局,并采用6种模型对各功能群不同取样尺度物种等级-多度曲线进行拟合并检验其拟合效果,分析多度格局与模型拟合在不同尺度间的差异,探讨其背后的生态学过程与机制。结果表明:(1)各尺度下落叶种比常绿种的物种数多,物种多样性指数更大,但个体数相对较少;不同功能群稀有种比例排序为:落叶种<所有种<常绿种。(2)6种模型中的断棍模型的拟合效果较差;中大尺度(50 m×50 m、100 m×100 m)上不同生活型树种多度分布能接受的模型较少,除大尺度的常绿树种外,拟合最优模型均为对数正态分布模型,大尺度的常绿树种拟合最优模型为中性模型;小尺度上(20 m×20 m)常绿树种的最优模型为对数正态分布模型,落叶树种最优模型为生态位优先模型,所有树种在小尺度最优模型为Zipf-Mandelbrot模型。研究认为,随着尺度逐渐扩大,中性过程较生态位过程对物种-多度格局的解释力度更大,落叶树种物种多度格局的形成机制较常绿树种更接近于样地所有树种物种-多度格局的形成机制。
Based on the 6 hm^2monitoring plot abundance data of Qizimei mountains Nature Reserve,we used the cumulative experience distribution curve(ECDF)to characterize the species-abundance distribution pattern of different life-form functional groups in the plot,and six models were used for each function.The species rank-abundance curves of different sampling scales were fitted and the fitting effect was tested.The differences between the abundance pattern and model fitting at different scales were analyzed,and the ecological processes andmechanisms behind them.Research indicates:(1)the number of deciduous species is larger than that of evergreen species at various scales,and the species diversity index is greater,but the number of individuals is relatively small.The ranking of rare species in different functional groups is:deciduous species<all species<evergreen species.(2)Among the six models studied in this study,the Broken-stick model has a poor fitting effect.There are few acceptable models for the abundance distribution of different life tree species on the medium and large scale(50 m×50 m,100 m×100 m).Except for the large-scale evergreen tree species,the best fitting models are log-normal distribution models.The optimal model for fitting large-scale evergreen tree species is a neutral model;the optimal model for small-scale(20 m×20 m)evergreen tree species is a log-normal distribution model,and the optimal model for deciduous tree species is a niche-first model.All The small-scale optimal model for tree species is the Zipf-Mandelbrot model.In general,as the scale gradually expands,the neutral process explains the species-abundance pattern more than the niche process,and the formation mechanism of the deciduous tree species abundance pattern is closer to all tree species in the plot than the evergreen species-Formation mechanism of abundance pattern.
作者
朱强
艾训儒
姚兰
朱江
彭宗林
ZHU Qiang;AI Xunru;YAO Lan;ZHU Jiang;PENG Zonglin(College of Forestry and Horticulture, Hubei University for Nationalities, Enshi, Hubei 445000, China;Hubei Qizimei Mountain National Nature Reserve Administration, Enshi, Hubei 445000, China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2020年第6期1061-1069,共9页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国生态环境部生物多样性调查评估项目(2019HJ2096001006)。
关键词
物种多度分布
生态过程
模型拟合
取样尺度
常绿落叶阔叶混交林
species abundance distribution
ecological process
model fitting
sampling scale
mixed evergreen deciduous broad-leaved forest
