摘要
以山西霍山七里峪植物群落为研究对象,用R语言分别对9个海拔梯度（1 200~2 000m）、5个空间尺度（100、400、900、1 600和2 500m2）和5个空间尺度下划分的6个径级（Ⅰ.DBH〈5cm、Ⅱ.5cm≤DBH〈10cm、Ⅲ.10cm≤DBH〈15cm、Ⅳ.15cm≤DBH〈20cm、Ⅴ.20cm≤DBH〈25cm、Ⅵ.DBH≥25cm）的植物群落谱系结构及其在不同研究方向上的变化规律进行分析,探讨其群落构建成因。结果显示：（1）在所有海拔梯度上,霍山七里峪植物群落都表现出一定的谱系结构,在不同海拔梯度上,群落谱系结构表现出一定的差异性,且在中低海拔群落的谱系结构是发散的,在较高海拔群落的谱系结构是聚集的。（2）5个空间尺度下研究区植物群落都具有谱系结构,且随着空间尺度的增加,谱系聚集程度越来越大。（3）不同径级下的群落都有一定的谱系结构,随着径级的增大,谱系聚集程度逐渐降低,趋向于发散结构,但在Ⅵ径级时群落聚集程度较Ⅳ、Ⅴ径级的高。研究表明,山西霍山七里峪植物群落在不同海拔梯度、不同空间尺度和不同径级下都表现出显著的谱系结构,与中性理论所预测的谱系随机并不相符,证明生态位理论在霍山植物群落构建过程中的作用更加重要。
Qiliyu region is located between the eastern margin of the Lingkong mountain and northern margin of the Mianshan Mountain,and it shows distinct transitional vegetation types and high species richness.The phylogenetic structure of a community is composed of the genetic relationships between species across the community.Phylogenetic structure is a synthetical indicator reflecting community construction＇s three ecological processes which are habitat filtering,competitive exclusion and stochastic processes.Understanding of the phylogenetic structure of a community will provide new insights into the different ecological processes in constructing the community.Our objective was to examine the effect of spatial factor on phylogenetic structure and determine the relative importance of neutral theory and niche theory in building the plant community in Huoshan mountain.We compared the phylogenetic structure of the community along different altitude gradient using data from 1 200 to 2 000 m,and examined the effects of five spatial scales（100,400,900,1 600 and 2 500m2）and six DBH classes（Ⅰ.DBH5cm,Ⅱ.5cm≤DBH10cm,Ⅲ.10cm≤DBH15cm,Ⅳ.15cm≤DBH20cm,Ⅴ.20cm≤DBH25cm,Ⅵ.DBH≥25cm）at five spatial scales on phylogenetic structure of the community in Qiliyu region.The results demonstrated that：（1）there were certain phylogenetic structure at all different altitudinal gradient.The phylogenetic structure of community was dispersed at middle-low altitude and clustered at higher altitude.（2）Communities were phylogenetically clustered at all spatial scales.With increasing spatial scale,the phylogenetic structure tended to cluster.（3）The effects of six DBH classes at five spatial scales on phylogenetic structure of the community were examined,which shows the result that the degree of phylogenetic clustering decreased with increasing DBH classes.However,the degree of phylogenetic clustering at the scale of DBH Ⅵ was higher than theⅣandⅤ.It turns out from our research that the prediction of niche the
出处
《西北植物学报》
CAS
CSCD
北大核心
2016年第12期2505-2512,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31270461)
山西师范大学校基金(ZR1211)
关键词
霍山
植物群落
谱系结构
空间格局
Huoshan mountain
plant community
phylogenetic structure
spatial pattern
