Assessment of standing biomass and litter-fall production in reforested mangrove stands within Douala-Edea National Park (Cameroon)

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Research Paper 17/03/2024
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Assessment of standing biomass and litter-fall production in reforested mangrove stands within Douala-Edea National Park (Cameroon)

Laurant Nyamsi-Moussian, Gordon N. Ajonina, Guillaume L. Essomè-Koum, Ernest F. Kottè-Mapoko, Boubakary, Alphonse Konango-Samè, Vanessa M. Ngo-Massou, Jean M. Emanè, Ndongo Din
J. Bio. Env. Sci.24( 3), 117-129, March 2024.
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Abstract

Ecological restoration is considered like the practical and sustainable management option for degraded mangroves. The ecological status of reforested mangrove areas (RMAs) in Douala-Edea National Park (DENP) is not well understood, despite extensive restoration projects. This study aims to estimate standing biomass and litterfall production in three RMAs located in Bolondo and Yoyo II. In each RMA and it natural vegetation, five 10m × 10m permanent sampling plots (PSPs) were established. Thirty PSPs were established equally in RMAs and natural vegetation. Height and diameter measurements were recorded, and allometric equations were used to estimate above-ground biomass (AGB) and below-ground biomass (BGB). In addition, 150 litter traps (1m × 1m) were evenly distributed across the PSPs to collect monthly litterfall, which was dried, sorted, and weighed. Mean abundances, diameters, and heights were: 4000±200 ind./ha, 1.2±0.5 cm, and 1.8±0.3 m; 3280±238.74 ind./ha, 2.58±0.85 cm, and 5.64±1.87 m; 2160±240.83 ind./ha, 2.93±1.4 cm, and 3.34±1.26 m for 3-year, 6-year and 11-year RMAs respectively. AGB, BGB, and annual litterfall biomass were: 11.98±0.76 kg/ha, 13.88±1.3 kg/ha, and 40.78±7.42 g/m²/year for 3-year RMAs; 61.18±2.16 kg/ha, 55.19±1.92 kg/ha, and 397.75±75.79 g/m²/year for 6-year RMAs; and 55.25±2.93 kg/ha, 47.8±1.31 kg/ha, and 576.23±106.75 g/m²/year for 11-year RMAs, respectively. These values correspond to approximately 12.31±2.19, 52.08±1.6, and 46.26±1.1 kgC/ha of total carbon sink and 18.27±3.48, 179.09±4.44, and 259.3±8.89 kgC/ha/year of total annual litterfall carbon sink. Although 6-year RMAs showed higher AGB and BGB than natural vegetation, the values remained lower overall. In contrast, 11-year RMAs exhibited higher annual litterfall production, indicating progress towards ecological balance.

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