Effects of coastal marsh conversion to shrimp aquaculture ponds on CH4 and N2O emissions. (5th December 2017)

• Record Type: Journal Article
• Authors: Yang, P.; Bastviken, D.; Lai, D.Y.F.; Jin, B.S.; Mou, X.J.; Tong, C.; Yao, Y.C.
• Is Part Of: Estuarine, coastal and shelf science. Volume 199(2017)
• Page Start: 125
• Page End: 131
• Publication Date: 2017-12-05
• Subjects: Land-use conversion -- Methane -- Nitrous oxide -- Tidal marsh -- Shrimp pond -- Anthropogenic influence; Estuarine oceanography -- Periodicals; Coasts -- Periodicals; Estuarine biology -- Periodicals; Seashore biology -- Periodicals; Coasts; Estuarine biology; Estuarine oceanography; Seashore biology; Periodicals; 551.461805
• DOI: 10.1016/j.ecss.2017.09.023
• Languages: English
• ISSNs: 0272-7714

Abstract

Abstract: In this study, we compared the CH4 and N2 O fluxes from a tidal brackish Cyperus malaccensis marsh ecosystem and nearby shrimp ponds, converted from C. malaccensis marsh in the last 3–4 years, in the Min River estuary of southeast China over the aquaculture period of the year. Significant differences in CH4 and N2 O fluxes were observed in space (between brackish marsh and shrimp ponds) and in time (between sampling occasions that were distributed over the aquaculture period). CH4 fluxes from the shrimp ponds were on an average 10-fold higher than from the brackish marsh. N2 O emissions, on the other hand, were lower from the shrimp pond (25% of the emissions from the brackish marsh). Accessory data indicates that these patterns were primarily linked to water level variability and temperature (all fluxes), sediment porewater sulfate concentrations (CH4 flux) and total nitrogen concentrations (N2 O flux). Our research demonstrates that the coastal marsh ecosystem converted to aquaculture ponds considerably alter emissions of CH4 and N2 O and provides input to the global discussion on how to account for emissions from various types of flooded land in greenhouse gas inventories. Graphical abstract: