期刊
FORESTS
卷 12, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/f12060738
关键词
Gilbertiodendron dewevrei; longitudinal; modeling; forest dynamics; Congo; Ituri
类别
资金
- Yale School of the Environment
The study on forest dynamics in central Africa reveals a significant pattern of developmental aggradation and net expansion of monodominant forest, driven by the slow spread of Gilbertiodendron dewevrei into adjacent mixed species forest, as well as landscape-scale recovery or response to widespread disturbance and exceptional stress tolerance traits of Gilbertiodendron dewevrei.
Patterns of structural change associated with monodominant tropical forest complexes have remained enigmatic for decades. Here, we extend previous efforts in presenting a longitudinal, local-scale analysis of forest dynamics in central Africa. Using four 10-ha census plots measured across three time periods (959,312 stems >= 1 cm DBH), we analyzed changes in a number of biometrical attributes for four distinct forest types capturing the developmental gradient from mixed species forest to Gilbertiodendron dewevrei-dominated forest. We modeled above-ground biomass (AGB), basal area (BA), and stem density across all species, and diameter at breast height (DBH), recruitment, and mortality for Gilbertiodendron dewevrei. We hypothesized that trends in these attributes are consistent with a slow spread of Gilbertiodendron dewevrei into adjacent mixed species forest. We identified statistically significant increases in AGB and BA across sites and positive, though nonsignificant, increases in AGB and BA for most forest types. DBH and relative recruitment increased significantly for Gilbertiodendron dewevrei stems, while relative mortality did not. When looking from mixed species to transitional to monodominant forest types, we found a statistically significant pattern of developmental aggradation and net expansion of monodominant forest. We do not attribute this to atmospheric forcing but to a combination of (a) landscape-scale recovery or response to widespread disturbance (primarily historical fires), (b) Gilbertiodendron dewevrei's ectomycorrhizal association, and (c) Gilbertiodendron dewevrei's exceptional stress tolerance traits.
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