| The structure characteristics, species diversity, species spatial distribution and abundance distribution pattern, niche and inter-species association etc. of the Rhododendron simiarum forests at different elevations in Tianbaoyan nature reserve were studied in this paper, the results showed that: 1) Rhododendron simiarum populations in the arbor layer at different elevations were mainly composed of small-diametered trees, that is, they mainly distributed at the range of 0～15cm, and the number of small-diametered trees>medium-to-small>middle>big, besides, the number of small-diametered trees in Rhododendron simiarum forests at all elevations were more than that of any other diameter ranks, and the number of trees at the range of 0～15cm at high elevations was much more than that at middle and low elevations, as for big- or middle-diametered trees and their proportion, the populations in Rhododendron simiarum forests at low elevations would dominate; 2) The height of trees in Rhododendron simiarum forests at different elevations all distributed at the range of 5～10cm, and the proportion was more than 50% as well; 3) The species diversity displayed the trend as arbor layer>herb layer>shrub layer in Rhododendron simiarum forests at high and low elevations; as for at middle elevations, it was shrub layer>herb layer>arbor layer; in addition, the variety of the vegetation decreased with the increase of the elevation, namely, high elevations |
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