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Seung Hyeon Kim,Zhaxi Suonan,Hyegwang Kim,Hwi-June Song,Kun-Seop Lee 한국해양환경·에너지학회 2021 한국해양환경공학회 학술대회논문집 Vol.2021 No.5
Since seagrass meadows rank among the Earth’s most productive aquatic ecosystems, they can sequester and store large amounts of organic carbon (C<sub>org</sub>), which is termed as “Blue Carbon”. Thus, seagrass habitats that serve as carbon sinks could play a key role in mitigation and adaptation of climate change. Globally, there is considerable interest in quantifying the capacity of blue carbon storage in seagrass meadows, but the information on blue carbon stock and factors affecting its variability are still lacking. In the present study, we assessed the C<sub>org</sub> stocks in 9 seagrass meadows on the coasts of Korea. Biological and environmental parameters in seagrass meadows were also measured to determine which factors could affect the variability of blue carbon stocks by the partial least square (PLS) regression analysis. C<sub>org</sub> stocks in living seagrass biomass ranged from 0.39 to 1.98 Mg C ha<sup>-1</sup>, which accounted for only 0.67-3.33% of total C<sub>org</sub> stocks in seagrass meadows, whereas those in sediments extrapolating to top 1 m ranged from 49.10 to 124.83 Mg C ha<sup>-1</sup>. According to our results of PLS model, 3 sediment characteristics such as dry bulk density and water and mud contents explained over 62% of the variation in sediment C<sub>org</sub> contents of seagrass meadows in Korean coastal waters. This study will provide invaluable information with respect to the variability of blue carbon sink and storage capacity associated with biotic and abiotic factors in seagrass meadows.
김종협,김혜광,김승현,김영균,이근섭,KIM, JONG-HYEOB,KIM, HYEGWANG,KIM, SEUNG HYEON,KIM, YOUNG KYUN,LEE, KUN-SEOP 한국해양학회 2020 바다 Vol.25 No.4
Although most species in genus Zostera inhabit shallow coastal areas and bays with weak wave energy, the Asian eelgrass, Zostera asiatica is distributed in deep water depth (8-15 m) unlike other seagrasses on the eastern coast of Korea. To examine factors limiting distribution Z. asiatica in relatively deep coastal areas, a transplantation experiment was conducted on October 2011, in which Z. asiatica shoots were transplanted from the reference site (donor meadow, ~9 m) to the shallow transplant site (~3 m). We compared shoot density, morphology, and productivity of Z. asiatica as well as environmental factors (underwater irradiance, water temperature, and nutrients) between the reference and transplant sites from October 2011 to September 2012. Shoot density and shoot height of transplants dramatically decreased within a few months after transplantation, but were similar with Z. asiatica in the reference site during spring. Shoot productivity were significantly higher in the transplant site than in reference site because of high light availability and nutrient concentrations. Transplants showed photoacclimatory responses such as higher rETR<sub>max</sub> and E<sub>k</sub> and lower photosynthetic efficiency in the transplant site than those in the reference site. Most of Z. asiatica transplant in the shallow transplant site disappeared in summer, which may be due to the high wave energy and physical damages induced by typhoons (TEMBIN and SANBA) in August and September 2012. According to the results of this study, Z. asiatica could not survive in shallow areas despite of more favorable light and nutrient conditions. Thus, Z. asiatica may restrictively occur in deep areas to avoid the intense physical stresses in the shallow area on the east coast of Korea.