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The Tidal Water Characteristics and the Mangrove Forest Biodiversity

Author(s): Takashi Asaeda; Abner Barnuevo; Mizanur Rahman

Linked Author(s): Takashi Asaeda

Keywords: Mangrove plantation; Rhizophora stylosa; Biodiversity; Hydrogen peroxide indicator; Ecohydraulics

Abstract: In mangrove plantation, Rhizophora stylosa is commonly selected to plant in many places due to high survival rate after planted, and high accessibility of propagules, etc. . However, R. stylosa excludes other species colonization with its high tree density and prop roots, and strange landscape is created in the panted area. The field observation indicated that, although the fraction of R. stylosa is widely distributed in natural forests, in the planted forests, R. stylosa nearly completely occupied the whole stands. The greenhouse experiments and field observations were conducted to evaluate the physiological condition of R. stylosa in various inundation types inundation with H2O2 concentration as an indicator. The submersion of the whole plant imposed a higher order of magnitude of stress, compared with the effect of salinity in the sea water level, and even caused sublethal damage when prolonged. In the field, high elevation and rare inundation are also considered stressful to R. stylosa and it had the significantly higher H2O2 levels, compared with those in the frequently inundated areas. The long-term negative effects of high H2O2 concentration of the plant and their community are manifested in the reduction of growth rate in the greenhouse cultured plants, as well as in the 30-year-old plantation in the field. The leaf H2O2 concentration is a useful indicator to show the feasibility of the habitat condition of mangroves. These findings could have valuable implications for restoration ecology as a basis for selecting areas appropriate for mangrove rehabilitation.


Year: 2023

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