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Gap Formation and Regeneration of Tropical Mangrove Forests in Ranong, Thailand

Tropical mangrove forests are characterized by clear zonation along a tidal gradient, and it has been supposed that the zonation is primarily controlled by soil factors. However, effects of disturbance on mangrove forests are still not well understood and may play an important role on the vegetation... Full description

Journal Title: Plant ecology 2006, Vol.186 (1), p.37-46
Main Author: Imai, Nobuo
Other Authors: Takyu, Masaaki , Nakamura, Yukito , Nakamura, Takehisa
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Dordrecht: Springer
ID: ISSN: 1385-0237
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recordid: cdi_proquest_miscellaneous_19522476
title: Gap Formation and Regeneration of Tropical Mangrove Forests in Ranong, Thailand
format: Article
creator:
  • Imai, Nobuo
  • Takyu, Masaaki
  • Nakamura, Yukito
  • Nakamura, Takehisa
subjects:
  • Bruguiera gymnorrhiza
  • Canopy gaps
  • Ceriops
  • Forest canopy
  • Forest ecology
  • Forest regeneration
  • Forests
  • Herbivores
  • Mangrove forests
  • Rhizophora apiculata
  • Saplings
  • Seedlings
  • Sonneratia
  • Trees
  • Tropical forests
  • Vegetation
  • Xylocarpus
ispartof: Plant ecology, 2006, Vol.186 (1), p.37-46
description: Tropical mangrove forests are characterized by clear zonation along a tidal gradient, and it has been supposed that the zonation is primarily controlled by soil factors. However, effects of disturbance on mangrove forests are still not well understood and may play an important role on the vegetation patterns and forest dynamics in some forest formations. In this study, the pattern of disturbance regime and its effects on regeneration of tropical mangrove forests along a tidal gradient were investigated in Ranong, Thailand. We established one or two 0.5 ha plots in four vegetation zones, i.e. Sonneratia alba-Avicennia alba zone, Rhizophora apiculata zone, Ra -- Bruguiera gymnorrhiza zone, Ceriops tagal-Xylocarpus spp. zone. Gap size (percentage gap area to total study area and individual gap size) was the largest in Sa-Aa zone which is located on the most seaward fringe, and it declined from seaward to inland. Canopy trees of S. alba and A. alba had stunted trunks and showed low tree density. On the contrary, canopy dominants in the other three inland zones, e.g. R. apiculata, B. gymnorrhiza, and Xylocarpus spp., had slender trunks and showed high tree density. Accordingly, differences in disturbance regime among the four zones were resulted from the forest structural features of each zone. Disturbance regime matched with regeneration strategies of canopy dominants. Seedlings and saplings of S. alba and A. alba, which need sunny condition for their growth, were abundant in gaps than in understorey. By contrast, R. apiculata, B. gymnorrhiza, and Xylocarpus spp., which can tolerate less light than S. alba and A. alba, had greater seedling and sapling density under closed canopy than gaps. Many large gaps may enhance the abundance of S. alba and A. alba in Sa-Aa zone, and a few small gaps may prevent the light demanding species to establish and grow in the other inland zones. Correspondence of disturbance regime and regeneration strategies (e.g. light requirement) of canopy dominants may contribute to the maintenance of the present species composition in each of the vegetation zones.
language: eng
source:
identifier: ISSN: 1385-0237
fulltext: no_fulltext
issn:
  • 1385-0237
  • 1573-5052
url: Link


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titleGap Formation and Regeneration of Tropical Mangrove Forests in Ranong, Thailand
creatorImai, Nobuo ; Takyu, Masaaki ; Nakamura, Yukito ; Nakamura, Takehisa
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descriptionTropical mangrove forests are characterized by clear zonation along a tidal gradient, and it has been supposed that the zonation is primarily controlled by soil factors. However, effects of disturbance on mangrove forests are still not well understood and may play an important role on the vegetation patterns and forest dynamics in some forest formations. In this study, the pattern of disturbance regime and its effects on regeneration of tropical mangrove forests along a tidal gradient were investigated in Ranong, Thailand. We established one or two 0.5 ha plots in four vegetation zones, i.e. Sonneratia alba-Avicennia alba zone, Rhizophora apiculata zone, Ra -- Bruguiera gymnorrhiza zone, Ceriops tagal-Xylocarpus spp. zone. Gap size (percentage gap area to total study area and individual gap size) was the largest in Sa-Aa zone which is located on the most seaward fringe, and it declined from seaward to inland. Canopy trees of S. alba and A. alba had stunted trunks and showed low tree density. On the contrary, canopy dominants in the other three inland zones, e.g. R. apiculata, B. gymnorrhiza, and Xylocarpus spp., had slender trunks and showed high tree density. Accordingly, differences in disturbance regime among the four zones were resulted from the forest structural features of each zone. Disturbance regime matched with regeneration strategies of canopy dominants. Seedlings and saplings of S. alba and A. alba, which need sunny condition for their growth, were abundant in gaps than in understorey. By contrast, R. apiculata, B. gymnorrhiza, and Xylocarpus spp., which can tolerate less light than S. alba and A. alba, had greater seedling and sapling density under closed canopy than gaps. Many large gaps may enhance the abundance of S. alba and A. alba in Sa-Aa zone, and a few small gaps may prevent the light demanding species to establish and grow in the other inland zones. Correspondence of disturbance regime and regeneration strategies (e.g. light requirement) of canopy dominants may contribute to the maintenance of the present species composition in each of the vegetation zones.
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subjectBruguiera gymnorrhiza ; Canopy gaps ; Ceriops ; Forest canopy ; Forest ecology ; Forest regeneration ; Forests ; Herbivores ; Mangrove forests ; Rhizophora apiculata ; Saplings ; Seedlings ; Sonneratia ; Trees ; Tropical forests ; Vegetation ; Xylocarpus
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descriptionTropical mangrove forests are characterized by clear zonation along a tidal gradient, and it has been supposed that the zonation is primarily controlled by soil factors. However, effects of disturbance on mangrove forests are still not well understood and may play an important role on the vegetation patterns and forest dynamics in some forest formations. In this study, the pattern of disturbance regime and its effects on regeneration of tropical mangrove forests along a tidal gradient were investigated in Ranong, Thailand. We established one or two 0.5 ha plots in four vegetation zones, i.e. Sonneratia alba-Avicennia alba zone, Rhizophora apiculata zone, Ra -- Bruguiera gymnorrhiza zone, Ceriops tagal-Xylocarpus spp. zone. Gap size (percentage gap area to total study area and individual gap size) was the largest in Sa-Aa zone which is located on the most seaward fringe, and it declined from seaward to inland. Canopy trees of S. alba and A. alba had stunted trunks and showed low tree density. On the contrary, canopy dominants in the other three inland zones, e.g. R. apiculata, B. gymnorrhiza, and Xylocarpus spp., had slender trunks and showed high tree density. Accordingly, differences in disturbance regime among the four zones were resulted from the forest structural features of each zone. Disturbance regime matched with regeneration strategies of canopy dominants. Seedlings and saplings of S. alba and A. alba, which need sunny condition for their growth, were abundant in gaps than in understorey. By contrast, R. apiculata, B. gymnorrhiza, and Xylocarpus spp., which can tolerate less light than S. alba and A. alba, had greater seedling and sapling density under closed canopy than gaps. Many large gaps may enhance the abundance of S. alba and A. alba in Sa-Aa zone, and a few small gaps may prevent the light demanding species to establish and grow in the other inland zones. Correspondence of disturbance regime and regeneration strategies (e.g. light requirement) of canopy dominants may contribute to the maintenance of the present species composition in each of the vegetation zones.
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abstractTropical mangrove forests are characterized by clear zonation along a tidal gradient, and it has been supposed that the zonation is primarily controlled by soil factors. However, effects of disturbance on mangrove forests are still not well understood and may play an important role on the vegetation patterns and forest dynamics in some forest formations. In this study, the pattern of disturbance regime and its effects on regeneration of tropical mangrove forests along a tidal gradient were investigated in Ranong, Thailand. We established one or two 0.5 ha plots in four vegetation zones, i.e. Sonneratia alba-Avicennia alba zone, Rhizophora apiculata zone, Ra -- Bruguiera gymnorrhiza zone, Ceriops tagal-Xylocarpus spp. zone. Gap size (percentage gap area to total study area and individual gap size) was the largest in Sa-Aa zone which is located on the most seaward fringe, and it declined from seaward to inland. Canopy trees of S. alba and A. alba had stunted trunks and showed low tree density. On the contrary, canopy dominants in the other three inland zones, e.g. R. apiculata, B. gymnorrhiza, and Xylocarpus spp., had slender trunks and showed high tree density. Accordingly, differences in disturbance regime among the four zones were resulted from the forest structural features of each zone. Disturbance regime matched with regeneration strategies of canopy dominants. Seedlings and saplings of S. alba and A. alba, which need sunny condition for their growth, were abundant in gaps than in understorey. By contrast, R. apiculata, B. gymnorrhiza, and Xylocarpus spp., which can tolerate less light than S. alba and A. alba, had greater seedling and sapling density under closed canopy than gaps. Many large gaps may enhance the abundance of S. alba and A. alba in Sa-Aa zone, and a few small gaps may prevent the light demanding species to establish and grow in the other inland zones. Correspondence of disturbance regime and regeneration strategies (e.g. light requirement) of canopy dominants may contribute to the maintenance of the present species composition in each of the vegetation zones.
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doi10.1007/s11258-006-9110-y