中条山油松人工林下物种对群落物种丰富度分布格局的贡献

Contribution of Undergrowth Species of Pinus tabuliformis Plantation to the Distribution Pattern of Community Species Richness in the Zhongtiao Mountain

该研究以中条山油松人工林群落为研究对象,研究林下不同大小的子群落对群落物种丰富度分布格局的贡献,并确定影响该区域群落物种丰富度分布格局的关键种,为区域物种多样性保护提供理论依据。结果表明:(1)该地区林下物种频度分布格局呈明显右偏,且不同样方物种丰富度存在明显差异。(2)常见种对群落丰富度分布格局的贡献大于稀有种。(3)最常见的物种解释了整个群落物种丰富度格局的88.4%(P<0.01),而最稀有物种仅解释了24.5%(P>0.05),去除最稀有物种后,最常见物种可以解释剩余物种的90.8%(P<0.01),而去除最常见物种后,最稀有物种仅能解释剩余物种的48.6%(P<0.01)。(4)当子群落中常见种越多时,子群落与整个群落的丰富度分布格局相关性越高。(5)连翘(Forsythia suspensa)、太平花(Philadelphus pekinensis)、鞘柄菝葜(Smilax stans)、多歧沙参(Adenophora wawreana)、金花忍冬(Lonicera chrysantha)等对群落物种丰富度分布格局的贡献最大,但并非越常见的物种对群落丰富度格局贡献越大。(6)与频度较高物种的种间关联度低的物种对于群落物种的分布格局贡献较大,但此解释并不适用于稀有种。研究发现,稀有种对中条山油松人工林群落物种丰富度分布格局存在较大的贡献,所以在油松人工林物种多样性保护过程中并不能只关注常见种而忽视稀有种。

In this study,the P.tabuliformis plantation community in the Zhongtiao Mountain was used as the research object,contribution of understory sub-assemblages of different samples to the distribution pattern of community species richness has been studied,and the key species that affect the distribution pattern of species richness in the region's community have been identified.This study will provide a theoretical basis for the conservation of regional species diversity.The results show that:(1)the distribution pattern of understory species frequency in this area is obviously to the right,and there are obvious differences in species richness in different samples.(2)The contribution of common species to the distribution pattern of community richness is greater than that of rare species.(3)The most common species explained 88.4%of the species richness pattern of the entire community(P<0.01),while the rarest species only explained 24.5%(P>0.05).After removing the rarest species,the most common species can explain 90.8%of the remaining species(P<0.01),while after removing the most common species,the rarest species can only explain 48.6%(P<0.01).(4)When there are more common species in the sub-assemblage,the higher the correlation between the sub-assemblage and the richness distribution pattern of the full assemblage.(5)Forsythia suspensa,Philadelphus pekinensis,Smilax stans,Adenophora wawreana and Lonicera chrysantha contribute the most to the distribution pattern of community species richness,and not the more common species contribute more to the community richness pattern.(6)Species with low interspecific associations with more frequent species contribute more to the distribution pattern of community species,but this explanation does not apply in respect of rare species.In the process of protecting the species diversity of P.tabuliformis plantations,we should not only focus on common species and ignore rare species.