不同等级廊道杉阔林下植被物种的多样性分析

Species diversity of China fir and broadleaf's undergrowth on different grade corridor

运用Shannon-Wiener物种多样性指数、Simpson生态优势度指数和物种差异性,对桃源县内三种不同等级廊道两侧的杉木林和阔叶林的灌木和草本层进行分析。结果表明:灌木和草本的数量有随廊道等级增加而逐渐减少的趋势;第三级廊道的生态优势度明显高于前两级廊道,第一级和第二级廊道生态优势度变化趋势不明显;灌木和草本的物种多样性随廊道等级增加而减少;灌木的物种差异性在不同等级廊道表现不同,第一级廊道物种差异性最小,其次为第三级廊道,第二级廊道物种差异性最大。

By using Shannon-Wiener index, Simpson ecology dominance index and species differences,the shrub and herb layers of China fir and broadleaf stand along both sides of three grade corridors in Taoyuan county were studied. The results show that the number of shrub and herb had an downward trend as increasing grade of corridor; the ecological advantage degree of the third grade corridor was obviously higher than that of the first two grade corridor, the ecological advantage degree of the first grade and the second level corridor had not obvious changes. Species diversity of shrub and herb species was decreased with the increase of corridor＇s grade; shrubs species diversity in different classes corridor performance was different, the first grade had minimum difference, the third grade corridor followed, the second grade corridor species diversity was the largest.