RESEARCH ON THE ANTI-WAVE POTENTIAL OF DIFFERENT EXPERIMENST OF MANGROVE FOREST PLANTATION IN SOME NORTHERN COASTAL PROVINCE OF VIETNAM

Abstract

The 4-year experiences of planting mangroves in sites with adverse conditions in Thai Binh and
Thanh Hoa provinces showed that mangroves grow best in formulas CT1-3; CT2-2 and CT3-2.
There is evidence indicating that the mangroves planted following these formulas efficiently
form anti-wave barriers. Among mangroves planted on marine swamps submerged in seawater in
Thai Binh province, those that were planted following formula CT1-3 presented the highest antiwave coefficient (i.e., 83.69%) and those that were planted following formula CT1-2 generated
the lowest anti-wave coefficient (i.e., 76.18%). For forests planted in sandy soil with strong wave
and wind coming daily in Thanh Hoa province, the single species (i.e., red-flowered apple
(Sonneratia caseolaris) mangroves with density of 3200 trees per hectare formed better antiwave barriers than the mixed species (i.e., red-flowered apple (Sonneratia caseolaris) mixed
with corky stilt (Rhizophora apiculata)) mangroves did. The highest and lowest anti-wave
coefficients recorded in mangroves planted on sandy soil in Thai Binh province were 89.60% (in
formula CT2-2) and 85.63% (in formula CT2-1), respectively. In the absence of mangroves,
wave height was only reduced by 28.3%. There is a close relationship between mangrove’s
growth factors such as Hvn, D
oo and D
t and mangrove’s anti-wave capacity. The taller and bigger
mangrove trees are, the better do they reduce the negative effects of waves. Particularly,
mangrove trees’ canopy diameter presents the best capacity in terms of reducing the wave
amplitude, followed by mangrove trees’ height and stem diameter