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Community Structure, Biomass and Carbon Stock of Mangroves in Areas Vulnerable to Typhoons in Eastern Visayas, Philippines

par Lagumbay, Irene Jean
Promoteur Dahdouh-Guebas, Farid ;Salmo III, Severino G.
Co-Promoteur Duya, Mariano Roy
Publication Non publié, 2023-08-31

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Résumé :

With the country’s geographic location, the Eastern Visayas is prone to typhoon disturbances. OnDecember 16, 2021, the Philippines was devastated by super typhoon Rai which had a significantdamage having a cost damage surpassing $602 million to both infrastructure and agriculture. This studyis focused on assessing the post-typhoon effect to the mangrove forest in the coastal areas of PacificTowns in Southern Leyte and it is also the first attempt to measure the carbon stock in the area. A totalof 155 plots with a total area of 1.68 ha were assessed covering 4 municipalities 5-months after thedisaster occurred. Results showed that 17 mangrove species belonging to 7 families were observedthroughout the survey and among the sites assessed, greatest biomass reduction of mangroves wasobserved in Saint Bernard (42.07 Mgha-1), followed by San Juan (19.34 Mgha-1), Hinunangan (15.43Mgha-1) and Silago (1.79 Mgha-1), respectively. Generally, all sites had very low diversity of which thehighest was recorded in San Juan (H’=1.77). Furthermore, mangrove species’ resilience to the disastrouseffect of ST Rai varies and among which, species under genus Rhizophora were most vulnerable withgreatest aboveground and belowground biomass (except in Hinunangan) for dead mangroves. Theamount of carbon that the mangrove forest can store also varies for which San Juan stored the greatest(431.25 MgCha-1). It is recommended that reforestation and rehabilitation activities should be carriedout by planting species that can withstand extreme disturbances from storms such as Sonneratia albaand Avicennia marina.