Structure and productivity along a tree height gradient in a Kandelia obovata mangrove forest in the Manko Wetland, Okinawa Island, Japan |
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Authors: | Rempei Suwa Kangkuso Analuddin Md Nabiul Islam Khan Akio Hagihara |
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Institution: | (1) Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus, Nishihara Okinawa, 903-0213, Japan;(2) Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa, Japan;(3) Forestry and Wood Technology Discipline, Khulna University, Khulna, Bangladesh |
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Abstract: | Tree height (H) of Kandelia obovata trees decreased sharply from 5 m at the forest interior behind the terrestrial forest to 1.5 m at the forest edge near the
river bank according to an increase in the yearly waterlogged period along a belt transect. The decreasing tree stature was
attributed to a decrease in the asymptote of H in the D
0.1 (stem diameter at H/10)-H relationship toward the edge. The K. obovata trees were well classified into interior and edge types using a discriminant function based on the habitat-specific D
0.1–H relationships. Allometric equations, as a function of D
0.12
H, differed significantly between the interior and edge types in the estimation of the phytomasses of stems and leaves, and
the leaf area per tree. On the other hand, common allometric equations were successfully established in the estimation of
respective phytomasses of aboveground parts and branches. Biomass and leaf area index decreased toward the forest edge. The
biomass allocation to stems decreased toward the edge, whereas those to branches and leaves increased. A dramatic change in
stem diameter increment resulted in differences in the D
0.1–H relationship along the tree height gradient. Relative growth rate of biomass and light-saturated net photosynthesis, which
paralleled net assimilation rate from the interior to the edge, showed their maximum peaks in the middle of the belt transect.
This indicates that there exists an optimal environmental condition for growth of K. obovata trees. Leaf nitrogen content tended to increase to the edge with increasing waterlogged period. |
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Keywords: | Allometry Dwarf stand Net assimilation rate Photosynthesis Relative growth rate |
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