Back to Search Start Over

Sediment Carbon Sequestration and Driving Factors in Seagrass Beds from Hainan Island and the Xisha Islands.

Authors :
Han, Qiuying
Qiu, Chongyu
Zeng, Wenxuan
Chen, Shiquan
Zhao, Muqiu
Shi, Yunfeng
Zhang, Xiaoli
Source :
Processes; Feb2023, Vol. 11 Issue 2, p456, 17p
Publication Year :
2023

Abstract

Seagrass beds are considered to be substantial sinks of "blue carbon". However, differentiation in the carbon sink capacities of seagrass beds in different regions with distinct nutrient conditions remains unclear. In this study, sediment carbon stocks, seagrass biomass, and microbial community structures and potential functions of seagrass beds in eutrophic seawater adjacent to Hainan Island and oligotrophic seawater around the Xisha Islands were compared. Our results showed that sediment mineralizable organic carbon and dry bulk density were substantially higher on Hainan Island than on the Xisha Islands (t-test, p < 0.05), while sediment carbon stocks and the total organic carbon were comparable between the two regions (p > 0.05). Similarly, seagrass biomass was much higher on Hainan Island (p < 0.05). Sediment carbon stocks positively correlated with sediment nitrogen and negatively correlated to sediment pH and grain size (p < 0.05). Bacterial diversities were similar in the two regions, while fungi were more diverse on Hainan Island (p < 0.05). Proteobacteria, Desulfobacterota, Ascomycota and Basidiomycota could account for degrading organic carbon on Hainan Island. Proteobacteria and Bacteroidota may contribute primarily to carbon loss in the seagrass beds of the Xisha Islands. This study strengthens our understanding of the effects of human activities on carbon sequestration in seagrass bed ecosystems. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
22279717
Volume :
11
Issue :
2
Database :
Complementary Index
Journal :
Processes
Publication Type :
Academic Journal
Accession number :
162158563
Full Text :
https://doi.org/10.3390/pr11020456