Sediment microbes mediate the impact of nutrient loading on blue carbon sequestration by mixed seagrass meadows

Liu, Songlin, Jiang, Zhijian, Zhang, Jingping, Wu, Yunchao, Huang, Xiaoping and Macreadie, Peter I. 2017, Sediment microbes mediate the impact of nutrient loading on blue carbon sequestration by mixed seagrass meadows, Science of the total environment, vol. 599-600, pp. 1479-1484, doi: 10.1016/j.scitotenv.2017.05.129.

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Title Sediment microbes mediate the impact of nutrient loading on blue carbon sequestration by mixed seagrass meadows
Author(s) Liu, Songlin
Jiang, Zhijian
Zhang, Jingping
Wu, Yunchao
Huang, Xiaoping
Macreadie, Peter I.ORCID iD for Macreadie, Peter I.
Journal name Science of the total environment
Volume number 599-600
Start page 1479
End page 1484
Total pages 6
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2017-12-01
ISSN 1879-1026
Keyword(s) carbon sequestration
enhalus acoroides
thalassia hemprichii
Summary Recent studies have reported significant variability in sediment organic carbon (SOC) storage capacity among seagrass species, but the factors driving this variability are poorly understood, limiting our ability to make informed decisions about which seagrass types are optimal for carbon offsetting and why. Here we show that differences in SOC storage capacity among species within the same geomorphic environment can be explained (in part) by below-ground processes in response to nutrient load; specifically, differences in the activity of microbes harboured by morphologically-different seagrass species. We found that increasing nutrient load enhanced the relative contribution of seagrass and algal sources to SOC pools, boosting sediment microbial biomass and extracellular enzyme activity within mixed seagrass meadows composed of Thalassia hemprichii and Enhalus acoroides, and thus possibly weaken the seagrass blue carbon sequestration capacity. The relative contribution of seagrass plant material to sediment bacterial organic carbon (BOC) and the influencing SOC-decomposing enzymes in E. acoroides meadows were half that of T. hemprichii meadows living side-by-side, even though the mixed seagrass meadows received SOC from the same sources. Overall this research suggests that microbial activity can vary significantly among seagrass species, thereby causing fine-scale (within-meadow) variability in SOC sequestration capacity in response to nutrient load.
Language eng
DOI 10.1016/j.scitotenv.2017.05.129
Field of Research 050301 Carbon Sequestration Science
060701 Phycology (incl Marine Grasses)
MD Multidisciplinary
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, Elseiver
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