Through assessment of forest structure, biomass of mangrove plantations
in the Thanh Phu Nature Reserve, Mekong Delta, Vietnam was analyzed in
correlation with diameter at breast height (DBH, i.e. at 1.3 m height).
Study plots were set up in 7, 11-22, and 26-year-old planted Rhizophora
apiculata Blume plantations. There is a significant inverse correlation
between DBH and tree density (R2 = 0.73; p < 0.01). To derive an
allometric relation to estimate aboveground biomass, 32 trees
representing all ages were chosen randomly and harvested at ground level
to examine allometric relations. We measured the fresh and dry weight
of stems (WS), branches (WB), leaves (WL), and aboveground stilt roots
(WR) in situ. Allometric relationships were satisfied best with DBH as
an independent variable (R2 = 0.72, 0.89, 0.87, 0.98, and 0.97 for
leaves, branches, stilt roots, stem, and total aboveground biomass,
respectively; p < 0.001). The total aboveground biomass was estimated
in the plantations to vary between 76 and 320 tons/ha. Of this, more
than 50% of total aboveground biomass was represented by stems. The
estimated biomass value of this study is consistent with that of other
mangroves in the world. Total biomass of R. apiculata plantation in
Thanh Phu Nature Reserve accounted for about 170,057 tons dry weight or
8056 tons C.
Journal of Coastal Research, Volume 31, Issue 5, 1 September 2015, Pages 1084-1090
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