期刊
MARINE POLLUTION BULLETIN
卷 134, 期 -, 页码 89-93出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.09.005
关键词
Seagrass meadows; Disturbances; Hydrogen sulphide; Methane
资金
- Sida Bilateral Marine Science Program
- VR/Sida project Assessment of carbon sequestering capacity in East African seagrass ecosystems affected by multiple stressors in a changing climate [SWE-2010-194]
- Institute of Marine Sciences (Zanzibar)
- Department of Botany (Applied Microbiology Unit) at the University of Dar es Salaam
Though seagrass meadows are among the most productive habitats in the world, contributing substantially to long-term carbon storage, studies of the effects of critical disturbances on the fate of carbon sequestered in the sediment and biomass of these meadows are scarce. In a manipulative in situ experiment, we studied the effects of successive loss of seagrass biomass as a result of shading and simulated grazing at two intensity levels on sulphide (H2S) content and methane (CH4) emission in a tropical seagrass meadow in Zanzibar (Tanzania). In all disturbed treatments, we found a several-fold increase in both the sulphide concentration of the sediment pore-water and the methane emissions from the sediment surface (except for CH4 emissions in the low-shading treatment). This could be due to the ongoing degradation of belowground biomass shed by the seagrass plants, supporting the production of both sulphate-reducing bacteria and methanogens, possibly exacerbated by the loss of downwards oxygen transport via seagrass plants. The worldwide rapid loss of seagrass areas due to anthropogenic activities may therefore have significant effects on carbon sink-source relationships within coastal seas.
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