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National Committee on Marine Sciences (NCMS)

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    Sedimentary blue carbon dynamics based on chronosequential observations in a tropical restored mangrove forest
    Ray, Raghab; Suwa, Rempei; Miyajima, Toshihiro; Munar, Jeffrey; Yoshikai, Masaya; San Diego-McGlone, Maria Lourdes; Nadaoka, Kazuo (Copernicus GmbH, 2023-03-03)
    Among the many ecosystem services provided by mangroves, the sequestration of large amounts of organic carbon (OC) in marine ecosystems (also known as “blue carbon”) has given these unique ecological environments enormous global attention. While there are many studies on the blue carbon potential of intact mangroves (i.e., naturally growing), there have been very few studies on restored mangroves (i.e., planted). This study aims to address this knowledge gap by examining the sediment development process during the early colonization (rehabilitation) of mangroves in an OC-poor estuary in Panay Island, Philippines. Based on source apportionment of multiple end-members in the sedimentary organic matter, the contribution of mangrove plant material was higher at the older sites compared to the younger sites or bare sediments where there is a higher contribution of riverine input. A clear increasing gradient according to mangrove development was observed for bulk OC (0.06–3.4 µ mol g−1, porewater OC (292–2150 µmol L−1, sedimentary OC stocks (3.13–77.4 Mg C ha−1), and OC loading per surface area (7–223 µmol m−2). The estimated carbon accumulation rates (6–33 mol m−2 yr−1) based on chronosequence are within the global ranges and show an increasing pattern with the age of mangroves. Hence, the sediments of relatively young mangrove forests appear to be a significant potential C sink, and short-term chronosequence-based observations can efficiently define the importance of mangrove restoration programs as a potential carbon sequestration pathway.
    We are grateful to the Japan International Cooperation Agency (JICA) and the Japan Science and Technology Agency (JST) through the Science and Technology Research Partnership for Sustainable Development (SATREPS) program for financially supporting the project Comprehensive Assessment and Conservation of Blue Carbon Ecosystems and their Services in the Coral Triangle (Blue CARES). We thank Jesus Abad, John Michael Aguilar, Dominic Bautista, Bryan C. Hernandez, and Tsuyoshi Kanda for their assistance during field surveys. We are grateful for the overall support given to the project by the University of the Philippines, Diliman, and Aklan State University. We are thankful to our Blue CARES colleague Charissa Ferrera for the support in language edits. Finally, authors sincerely thank AE (Jack Middelburg) and the reviewers for their constructive comments that have greatly improved the revised version of the manuscript.
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    Firm assures no oil debris will be left in Guimaras
    Angelo, Francis Allan L. (Daily Guardian Multi-Media Services, Inc., 2020-07-21)
    The owner of the power barge stationed in Iloilo City that triggered an oil spill earlier this month assured local officials of Guimaras that it will never leave the island until it has cleaned up the spill. In a meeting on July 18, 2020, representatives of AC Energy Philippines said it will do everything to clear the island province of oil sludges and other contaminants that affected more than 30 villages. AC Energy owns Power Barge 102 which exploded and caused an oil spill last July 3, 2020. The barge is stationed at Bo. Obrero, Lapuz which was also heavily affected by the spill.
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    Mangrove park outside of planned Bulacan airport
    Orejas, Tonette (Philippine Daily Inquirer, Inc., 2019-08-24)
    A mangrove park that was rehabilitated by the Department of Environment and Natural Resources (DENR) in a town in Bulacan province is far from the proposed 2,500-hectare New Manila International Airport project of San Miguel Holdings Corp. (SMHC). Bulakan town’s Mangrove Ecopark is 277 meters away from the proposed SMHC aerotropolis and will not be affected by its construction, according to a certification issued on July 22 by Emelita Lingat, Bulacan provincial environment and natural resources officer. Bulakan residents have been concerned about the ecopark at Sitio Wawang Capiz in Barangay Taliptip, which is north of the planned P734-billion international gateway.