Blue carbon stock of aquasilviculture-based agroforestry system in Infanta, Quezon, Philippines
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Abstract
Blue carbon stock of the four aquasilviculture (AQS) systems within a Community-based Mangrove Forest Management area in Infanta, Quezon was assessed. Results demonstrated that the aboveground biomass and root carbon stock of the four AQS differed significantly (p<0.05). AQS 4, adopted the peripheral/separate model type of AQS and dominated by Rhizophora sp., possessed significantly greater aboveground C stock (101.12 Mg ha-1) and root C stock (48.05 Mg ha-1). While the Aegiceras sp.-dominated AQS 3, which adopted the mixed model type, and with semi-intensive grow-out polyculture, had the highest total C sediment stock at 1,023 Mg ha-1. Overall, AQS 4 had the highest total carbon stock, calculated at 1,141.47 Mg ha-1. A large portion of the C stock potential of each AQS is derived from the sediment carbon pool which accounted for up to 87.5% of the total C pool, according to the results. Findings indicated that AQS contributes a substantial amount of total carbon stock comparable to that of a pure mangrove ecosystem. If valued, the blue carbon stock of the aquasilviculture systems ranged between Php 901,491.86 (USD 16,510.84) and Php 983,540.38 (USD 18,013.56). This can provide the People's Organization with additional income in addition to the income generated from their cultivation of aquatic species. Therefore, aquasilviculture system is a good climate mitigation strategy with socio-economic advantages
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