The effect of patch demography on the community structure of forest trees |
| |
Authors: | Takashi Kohyama |
| |
Institution: | (1) Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan;(2) Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3137-25 Showamachi, Kanazawa-ku, Yokohama 236-0001, Japan |
| |
Abstract: | The effect of patch demography on the structure of forest tree communities was examined using a patch-age and tree-size structured
model of forest dynamics. Changes in abundance of species of different types (four different maximum tree-size classes each
in two or three shade-tolerance classes) were numerically modeled in response to changes in the duration of the gap-formation-free
lag phase. Average patch mortality was identical in all simulations. Tolerant species were more abundant without a lag phase
due to larger variation in patch longevity, while subtolerant or intolerant species were successful when patch longevity was
fixed with a long duration of lag phase. Variation in patch-age distribution facilitated species coexistence. Increasing ‘advance
regeneration’, or surviving fraction at gap formation, brought about the exclusive dominance of the tolerant species. Results
suggest that patch demography plays a significant role in the community organization of forest trees. In species-rich systems
like tropical rain forests, longevity or canopy duration of large trees can differ among species, which brings about the variation
in patch longevity, thus promoting further coexistence of species. |
| |
Keywords: | Advance regeneration Coexistence Gap dynamics Lag phase One-sided competition Patch mortality Shade tolerance Simulation |
本文献已被 SpringerLink 等数据库收录! |
|