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57DOI: http://dx.doi.org/10.29677/MR.202406_4(1).00052024, 4(1),57-78Marine Research of the National Academy of Marine ResearchISSN: 2709-6629 (Vol.4 Iss.1)GPN: 2011200033A Subsoil Inspection in a Mangrove Habitat Using ElectricalResistivity TomographyShang-Hung Pao 1 Yen-Kung Hsieh 2 Helsin Wang 3 Yao-Chu Tsai 3 Li Lo 4Chun-Sheng Lee 5 Chia-Jung Chen 5 Chih-Hsin Hu 3* Hsing-Juh Lin 1*1 Department of Life Science, National Chung Hsing University, Taichung, Taiwan2 Climate Change Research Center, National Environmental Research Academy, Taoyuan, Taiwan3 HCK Geophysical, Taipei, Taiwan4 Department of Geology Science, National Taiwan University, Taipei, Taiwan5 EverWin Engineering Consultants Co., Ltd., Taichung, TaiwanABSTRACT Blue carbon refers to organic carbon sequestered in marine ecosystems, which can make a significant contribution to the removal of carbon dioxide from the atmosphere. Coastal blue carbon ecosystems are important transition areas connecting land, ocean, and even freshwater, including mangroves, salt marshes, and seagrass beds. Among the three major coastal blue carbon ecosystems, mangroves are the most widely distributed in Taiwan. The electrical resistivity tomography (ERT) method has been used for a wide range of near-surface geological, engineering,and environmental purposes. In this study, the ERT method was used for the first time to assist indepth inspection tasks for organic carbon storage in the mangroves located in the Wazihwei NatureReserve of northern Taiwan. Several ERT survey lines, each around 800 meters in length, werealigned at two sites of the mangroves. The proposed survey depth was set up to approximately 20-30 meters deep. A single borehole sampling was carried out at the northern boundary of themangrove reserve to confirm the corresponding stratigraphic profile and core sampling analysis. The results of the ERT images showed that the organic carbon of the mangroves in the subsoil canextend up to 3 to 5 meters deep. The volume of organic carbon storage in the mangroves can reach0.9%u00d7106-1.5%u00d7106 m3 according to a mangrove area of 30 hectares.Keywords: Electrical resistivity tomography, mangroves, subsoil, organic carbon storage.* Corresponding authors, E-mails: sunhu88@ms29.hinet.net; hjlin@dragon.nchu.edu.tw Received 6 March 2024, Accepted 16 May 2024.