佛坪自然保护区植物群落物种多样性与海拔梯度的关系

The Relationships of Higher Plants Diversity and Elevation Gradient in Foping National Reserve

用多元统计分析方法研究了佛坪自然保护区植物群落物种多样性及群落各生长型多样性特征沿海拔梯度的变化。结果表明 :1)植物群落的Shannon指数与Simpson指数及物种丰富度与海拔梯度均呈显著负相关关系 ;2 )乔木层的物种多样性沿海拔梯度的变化则体现了“中间高度膨胀”的规律 ,即中等海拔高度上多样性高而低海拔和高海拔多样性较低 ;3)灌木层丰富度指数在 16 0 0～ 170 0m之间有个很不明显的峰值 ,而其它 4个指标沿海拔呈单调的下降趋势 ;4 )草本层植物多样性呈先降后升的趋势 。

The relationships between species diversity indices of plant in communities and altitude gradient of Foping National Reserve were studied using multiple regression analysis. The results are as follows: 1) The Shannon index, Simpson index and species richness of communities are negatively related to latitude significantly. 2) The species diversity of arbor layer showing a rule of 'Mid altitude bulge' with change of altitude, means that it is higher in intermediate altitude while lower in lower and higher altitude. 3) There is a no obvious peak value of species richness of shrub layer at Alt. 1600-1700m, while the other four diversity indices decreased monotonously with altitude. 4) All of the species diversity indices of herb layer are lower at intermediate altitude.