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- Title
Identifying the Salinity Thresholds that Impact Greenhouse Gas Production in Subtropical Tidal Freshwater Marsh Soils.
- Authors
Wang, Chun; Tong, Chuan; Chambers, Lisa; Liu, Xingtu
- Abstract
Increasing salinity due to sea level rise is an important factor influencing biogeochemical processes in estuarine wetlands, with the potential to impact greenhouse gas (GHG) emissions. However, there is little consensus regarding what salinity thresholds will significantly alter the production of GHGs or the physiochemical properties of wetland soils. This study used a fine-scale salinity gradient to determine the impact of seawater concentration on the potential production of CH, CO and NO and associated soil properties using bottle incubations of tidal freshwater marsh soils from the Min River estuary, SE China. Potential CH production was unaffected by salinities from 0 to 7.5‰, but declined significantly at 10‰ and above. Potential CO production was stimulated at intermediate salinities (5 to 7.5‰), but inhibited by salinities ≥15‰, while potential NO production was unaffected by salinity. In contrast, soil dissolved organic carbon and NH -N generally increased with salinity. Overall, this research indicates salinities of ~10-15‰ represent an important tipping point for biogeochemical processes in wetlands. Above this threshold, carbon mineralization is reduced and may promote vertical soil accretion in brackish and salinity wetlands. Meanwhile, low-level saltwater intrusion may leave wetlands vulnerable to submergence due to accelerated soil organic carbon loss.
- Subjects
SOIL salinity; GREENHOUSE gases; WETLANDS
- Publication
Wetlands, 2017, Vol 37, Issue 3, p559
- ISSN
0277-5212
- Publication type
Article
- DOI
10.1007/s13157-017-0890-8