Carbon storage assessment of sea grass Suaeda salsa community in Liaohe Estuary wetland based on HY-1C CZI data
LI Wei, WANG Wenshuo, ZHANG Xinyu, DUAN Yuanpeng, YANG Jianbo
1.College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China; 2.Technology Innovation Center for Coastal Ecological Environment and Disaster Protection, Dalian 116023, China
Abstract: In order to use the HY-1C CZI data with higher spatial and temporal resolution to accurately assess the carbon storage and carbon sequestration efficiency of sea grass Suaedasalsa in Liaohe Estuary wetland (121°23′-122°29′E， 40°39′-41°27′N), the spectral data and samples of Suaedasalsa were collected in September of 2013 and 2018, and the biomass and carbon content were measured. The aboveground biomass inversion model was constructed based on transformed soil adjusted vegetation index (TSAVI) by regression analysis. The allometric growth model was used to estimate the belowground biomass, and then to estimate the carbon storage and carbon sequestration income of Suaedasalsa in Liaohe Estuary wetland. The results showed that linear model was the best inversion model for aboveground biomass of Suaedasalsa in Liaohe Estuary wetland. The coefficient of determination R2 of the model was 0.69 (P<0.05), the values of root mean square error (E) and predictable skill (Skill) of the ground data verification set were 0.078 and 0.929, the values of relative root mean square error (Er) and Skill of the satellite data verification set were 9.55% and 0.987. It was estimated that the aboveground biomass of Suaedasalsa community in Liaohe Estuary wetland in 2018, 2019 and 2020 were 1.69×106, 1.13×106 and 3.26×106 kg, the belowground biomass of Suaedasalsa community were 3.02×105, 2.03×105 and 5.81×105 kg, the total biomass were 1.99×106, 1.33×106 and 3.85×106 kg, and then the annual carbon storage of Suaedasalsa community were 6.06×105, 4.06×105 and 1.17×106 kg. The findings indicate that based on HY-1C CZI data to evaluate the carbon storage of Suaedasalsa is feasible. The temporal and spatial distribution of carbon storage is consistent with its biomass distribution. The aboveground part of Suaedasalsa is the main carbon storage part. The Suaedasalsa in the Liaohe Estuary wetland has high ecological and economic benefits. This study has important reference value for the study of the blue carbon sink ecosystem in Liaohe Estuary wetland and the realization of carbon neutrality goal, and can provide technical and data support for the assessment of carbon storage in Liaohe Estuary wetland.
2022, Vol. 37 
