摘要
采用点格局方法,以Ripley′s函数为基础,运用L(r)函数对我国不同气候带优势高山垫状植物种群进行点格局分析。结果表明,不同气候带垫状植物的空间分布在小尺度(0~5 m)上以随机和聚集分布为主,无均匀分布的情况出现;在表现出空间聚集的垫状植物种群中,随着尺度的增加,聚集程度下降,甚至转化为随机分布。对于高山垫状植物群落而言,优势垫状植物的空间格局是以局部空间结构为核心的垫状植物群落构建和物种多样性维持的基础。由于种间竞争和互利作用发生在较小距离内,因而种群小尺度的空间结构对垫状植物群落构建和物种多样性格局的形成至关重要。
Ecological functions of the dominant cushion plants are closely related with its spatial point pattern,which is the basis of cushion plant can sustain plant community diversity and participate in community assembly.However,spatial pattern of alpine cushion plants is still poorly understood in different climatic zones of China.In this study,spatial point patterns of dominant cushion plants in alpine fell-field from different climatic zone of China were investigated.The results indicated that spatial distributions of cushion plants on 0-5 m scale were random and aggregated distribution.Uniform distribution was not observed in all cushion plants species mainly due to harsh mountain environment.With the scale increased in cushion plants populations that exhibited spatial aggregated distribution,the aggregation degree was decreased,and even changed into random distribution.With the altitude increased,the gathered scale was smaller.The population spatial structure would affect the population dynamics,and thus affected cushion plants community assembly due to intraspecific competition and mutually beneficial effect occurred in small range.Therefore,small scale spatial pattern had an important role in cushion plant community assembly and structure forming of species diversity based on local spatial structure.
作者
赵锐明
回嵘
ZHAO Ruiming;HUI Rong(College of Agronomy,Gansu Agricultural University,Lanzhou 730070,China;Shapotou Desert Research Experimental Station,Northwest Institute of Eco-environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《生态科学》
CSCD
2023年第2期145-154,共10页
Ecological Science
基金
国家重点研发计划(2018YFC0406603)
甘肃农业大学2019年公招博士科研启动基金(GAU-KYQD-2019-02)。
关键词
垫状植物
空间点格局
寒漠
群落构建
cushion plant
spatial point pattern
fell-field
community assembly
