PATTERNS OF DIVERSITY IN THE STRATA OF BOREAL MONTANE FOREST IN BRITISH-COLUMBIA

被引：51

作者：

BENAYAS, JMR

机构：

[1] Departamento de Ecología, Facultad de Ciencias, Universidad de Alcalá, Alcalá de Henares

来源：

JOURNAL OF VEGETATION SCIENCE | 1995年 / 6卷 / 01期

关键词：

COMPLEXITY; ENVIRONMENTAL FACTOR; LIFE FORM; SIMILARITY; SPECIES RICHNESS;

D O I：

10.2307/3236260

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Patterns of diversity were analyzed in a boreal coniferous forest and its strata (tree, shrub, herb and bryophyte layers): number of species per community - alpha-diversity, total species richness - gamma-diversity, mean similarity - beta-diversity, and mosaic diversity, a measure of complexity. These four measures of diversity consistently decreased from lower to upper vegetation layers. To study the effect of juveniles of larger life forms on diversity of lower layers, they were removed from the data and the measures of diversity reanalyzed. Number of species per community and mosaic diversity decreased substantially, but beta-diversity did not change. So, the effect of juveniles on gamma-diversity is due to the greater number of species per community. Multiple regres sion models revealed that the relationships between alpha-diversity and the environmental variables were the same for the whole forest and for the herb layer. Elevation and soil pH were the major variables explaining alpha-diversity in the whole community. Climate was the only environmental gradient related to species richness in all individual strata. Tree and herb richness values were negatively related to soil drainage and acidity, respectively. Species richness of the plant community was affected by environmental variability mostly through the herb layer. Various explanations of the observed diversity patterns included: environmental constraints, resource competition, generation time, and colonization processes.

引用

页码：95 / 98

页数：4

共 29 条

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