| In this paper,the subalpine meadow of Heyeping in Luya Mountain was taken as the research object.A systematic sampling method was used to set a total of 150 1m×1m herbaceous plots.Based on the analysis of the characteristics of subalpine meadow community in Heyeping,Luya Mountain,the multi-dimension diversity pattern and the correlation between diversity and environmental factors in the study area were measured,and analysis of the relationship between the various dimensions of diversity index.This paper aims to clarify the composition and community structure of subalpine meadow species in Luya mountain,reveals the differentiation mechanism and variation rule between various diversity indexes and environmental factors.The main results are as follows:1)A total of 1 category,2 classes,16 species,21 families,40 genera,and 51 species of vascular plants were discovered through field investigations.They were all angiosperms.Among them,4 species and 4 families,5 genera and 5 species of monocots,12 species,18families,36 genera,and 46 species of dicotyledons.According to the division of geographical flora of Chinese seed flora,the subalpine meadow flora of Heyeping in Luyashan can be divided into 10 types of 8 distribution types.Using the TWINSPAN classification method and based on the nomenclature principle of“Chinese Vegetation”[1],150 samples in the study area were divided into 12 clusters.2)According to the results of the analysis of species diversity index,there are two characteristics of species diversity in the study area:first,the dominant position is prominent,and the advantage is obvious in the community.Second,under the"edge effect",the meadow edge area is more diverse than other regions.Among the 30 plots,the community lineage structure of 7 plots showed an aggregation pattern,indicating that the habitat filtering function was dominant in these plots;the community lineage structure of 15 plots showed a decentralized pattern,indicating that the competitive repulsion in these plots was leading.Among the 12 clusters,the community lineage structure of the 4 clusters showed an aggregation pattern,and the community structure of the 4 clusters showed a dispersed pattern.3)The theoretical mean values of the taxonomic diversity indices?+and?+at the plot scale were 302.5 and 79.9,respectively,and the theoretical averages at the cluster scale were 323.3 and 76.4.Combining the taxonomic diversity values of the plots and communities.This shows that the species classification in the study area is uniform.The five functional diversity indices selected in this study showed that the range of change in the index values was small on both plot and cluster scales,indicating that the functional heterogeneity of the subalpine meadow species in the Luya Mountain is lower.That is,there is little difference in function among species within the community.4)The correlations between plant species diversity,pedigree diversity,taxonomic diversity,and functional diversity are quite different.The pedigree diversity index was significantly correlated with species richness?p<0.01?,indicating that the ecological niche in the study area was conservative,and there was no stable correlation between the other indices;there was no significant correlation between the taxonomic diversity index and the species diversity index;the index of pedigree was significantly correlated with the richness of species?p<0.05?,but there was no significant correlation between functional uniformity and functional dispersion,indicating that the functional community of the functional community in the study area have little difference.5)By analyzing the correlations among the four types of diversity indices and environmental factors,it was shown that only the species evenness index was related to the slope and aspect,and the other indices had no correlation.The forest line is the key factor affecting the distribution pattern of species diversity and the relationship of species in the subalpine meadow of Luya mountain. |
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