甜槠天然群落主要种群高度生态位在不同强度人为干扰下的动态变化

对甜槠天然群落中主要种群的高度生态位宽度及生态位重叠在不同人为干扰强度下的变化动态进行了测度和分析。人为干扰会改变多数树种的高度生态位宽度排序，但未改变优势种的高度生态位宽度排序，在同一干扰强度的甜槠群落中均为最大。在轻度人为干扰群落中，甜槠的高度生态位宽度值远高于其它树种；而在重度人为干扰群落中，甜槠的高度生态位宽度减小，与其它种之间的差值也明显减小，说明它对高度空间资源的利用率下降。人为干扰所产生的异质性生境可促进或抑制植物种的生长，使物种利用高度空间资源的能力发生变化，从而使种与种的生态位的重叠状况发生变化。

The Dynamic Trends of Height Niche of Main Population of Natural Castanopsis eyrei Communities under Different Human - caused Disturbance

Under different human-caused disturbance, the dynamic trends of height niche breadth and (overlap) of the main population were measured and analyzed in natural Castanopsis eyrei communities. Human-caused disturbance changed the sequence of height niche breadth of most trees but did not change that of the dominant species. In the Castanopsis eyrei communities, the height niche breadth of the dominant species was the greatest under the same human-caused disturbance. Under slight human-caused disturbance, the height niche breadth of Castanopsis eyrei was greatly higher than that of other species. Under intense human-caused disturbance, the height niche breadth of Castanopsis eyrei was lessened and the difference between Castanopsis eyrei and other species was also lessened obviously, which showed that the utilization ratio of its height space resources decreased. Human-caused disturbance produced unusual habitats, which could promote or restrain the growth of the plant. This changed the ability of using the height space resources so that the height niche overlap between species varied.