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Volume 40 Issue 5
Oct.  2021
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DONG Qian,YOU Yonggang,LUO Weiqun,et al.Species composition and niche differences of dominant populations of plant communities from different parent rocks in karst area[J].Carsologica Sinica,2021,40(05):849-859. doi: 10.11932/karst20210511
Citation: DONG Qian,YOU Yonggang,LUO Weiqun,et al.Species composition and niche differences of dominant populations of plant communities from different parent rocks in karst area[J].Carsologica Sinica,2021,40(05):849-859. doi: 10.11932/karst20210511

Species composition and niche differences of dominant populations of plant communities from different parent rocks in karst area

doi: 10.11932/karst20210511
Funds:

 2019YFC0507504

 DD20190502

 31870707

  • Received Date: 2021-03-17
  • Publish Date: 2021-10-25
  • The landform of Pingguo City, Baise City, Guangxi Zhuang Autonomous Region, belongs to the typical peak cluster type in the karst area of southwest China. Pure limestone is the main local lithology, and limestone with dolomite is one of the more common lithologies in Pingguo City.Studying the species composition and niche differences of karst forest communities under different lithological backgrounds will help to understand the resource utilization of various plant groups under different lithological conditions. At the same time, it will be useful for scientifically formulating the vegetation restoration plan for stony desertification control in this area. It is of great significance. Taking natural secondary forests of pure limestone, limestone and dolomite in Pingguo City,as the research object, through the preliminary investigation, a total of 6 sample plots of 30 m×30 m were set up in typical areas of pure limestone and limestone with dolomite in Pingguo City. Based on the field community survey, the Levin niche width and Pianka niche overlap index were used to analyze the niche characteristics of dominant populations.The results showed that 56 species of vascular plants were investigated in the pure limestone habitat, belonging to 35 families and 45 genera, and 44 species of vascular plants were investigated in the limestone-dolomite habitat, belonging to 33 families and 42 genera.The species richness of Moraceae had obvious advantages in the two habitats, mainly Ficus and Artocarpus.Legumes, Urticaceae, Meliaceae plants dominate in pure limestone habitats; Euphorbiaceae plants dominate in limestone-dolomite habitats, and the overall community similarity was low. The tree layer plant Excentrodendron hsienmu, the shrub layer plant Laportea violacea and the herb layer plant Nephrolepis cordifolia were the common species in the vegetation of the two parent rock habitats and had a high niche breadth index. The number of dominant species in the pure limestone forest arbor layer and the shrub layer did not overlap at all. The number of species pairs was 14 higher than that in the limestone dolomite forest. The pure limestone forest was relatively rich in species of trees and shrubs.During the restoration of vegetation in karst areas, species with higher niche width should be preferentially selected as pioneer tree species based on different lithological backgrounds, and tree species with low niche overlap should be considered as companion species to avoid unsuitable growth of plants or conflicts in niche functions .

     

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