Title
Spatial variation in the structure and litterfall of a Sumatran rain forest
Document Type
Article
Publication Date
1985
Volume Number
17
Source Publication
Biotropica
Abstract
In this paper an explanation for the spatial variation in the structure of a Sumatran rain forest is suggested. The forest area consisted of a series of topographical units (terraces, mountain slopes) of increasing age and decreasing pH and fertility. With increasing soil age the production of leaf litter and fruit decreased whereas the proportion of mature-phase forest increased and gap cover decreased. There is variation in the growth strategies of trees depending on soil fertility; this results in higher tree longevity on poor soils, and hence in forest with fewer gaps and with more large trees, than on rich soils. Thus, Janzen's (1974) hypothesis of the effect of soil fertility on the prevalence of anti-herbivore defenses and fruiting periodicity is extended to include aspects of forest structure.