Tiềm năng giảm phát thải khí nhà kính của cỏ biển ven bờ - Nghiên cứu điểm tại khu vực Thừa Thiên Huế

Abstract

Recently, several coastal countries have considered seagrass development as a solution to mitigate greenhouse gas emissions. Up to now, the important role of the "blue carbon" ecosystem in responding to climate change has been noticed by about 50 countries. This study aims to estimate the CO₂ storage of seagrass ecosystem using the greenhouse gas inventory method introduced by the Intergovernmental Panel on Climate Change (IPCC) to agree on with the national greenhouse gas inventory method, through which it is possible to consider the potential contribution to the Nationally Determined Contribution (NDC) of Vietnam's coastal seagrasses. The results of sample analysis in the laboratory and calculations show that in the study area, the CO₂ storage coefficient of seagrass fluctuates by species, ranging from 0.064 to 2,55 tons of CO₂/ha. The fresh yeild of seagrass is estimated at 8,771.46 tons, equivalent to 9.80 tons/ha. The total CO₂ absorbed by seagrass in the area at the time of the study reached the highest value of 2,304.13 tons, equivalent to 2.55 tons of CO₂/ha. This capacity approximates 75% of the current average CO₂ absorption from forests (3.40 tons of CO₂/ha). Result shows that the role of seagrass in absorbing CO₂ is very noteworthy and more specific and comprehensive studies and calculations are needed to contribute to efforts to reduce greenhouse gas emissions towards the goal of carbon neutrality by 2050. The CO₂ absorption coefficients of seagrass in the Tam Giang - Cau Hai lagoon and Lap An lagoon have been estimated. These are important parameters used to inventory CO₂ emissions/absorption by the IPCC method and can be considered to be added to the list of emission coefficients for greenhouse gas inventory for seagrass of Vietnam.