Information extraction and spatial and temporal evolution of blue carbon storage in wetlands of Liaohe estuary
In order to fully utilize blue carbon's ability for sequestering carbon,mitigate climate change,and meet environmental protection objectives,a quantitative assessment of the storage and sequestration of blue carbon in coastal wetlands is crucial.This study used the Liaohe Estuary wetland as its research object,and it retrieved and analyzed data from Sentinel-2A images covering the wet-land from 2017 to 2021.Using the InVEST evaluation model,the quantitative assessment and analy-sis of the blue carbon storage properties in the Liaohe Estuary wetland was conducted.Based on this,a prediction was made regarding the net carbon fixation of blue carbon in the study area over the next 30 years.The findings indicated that:①Artificial wetland types occupied about 20％of the study area from 2017 to 2021,with an overall growing trend;natural wetlands occupied more than 70％,with a decreasing trend overall.The interplay between natural and manmade wetland was the most intricate shift among the various forms of wetland.②From 2017 to 2021,the study area's total blue carbon reserves exhibited an overall increasing trend,while the total accumulated blue carbon showed an overall lowering trend.However,the two's geographical distribution pattern remained steady and did not drastically alter.③Throughout the next 30 years,the study area's net carbon fix-ation value will primarily show an increasing trend.By 2050,the total net carbon fixation value of blue carbon is estimated to reach 3 094.270 7× 104t,with the highest value of net carbon fixation per unit area rising to 867.90 t/hm2 and the lowest value falling to-63.03 t/hm2.
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