The Impact of Sea Embankment Reclamation on Greenhouse Gas GHG Fluxes and Stocks in Invasive Spartina alterniflora and Native Phragmites australis Wetland Marshes of East China
| Autor: | Daolin Du, Li Guanlin, Ren Guangqian, Guirong Wu, Jian Li, Taitiya Kenneth Yuguda, Zhanrui Leng, Yueming Wu, Yongcan Jiang |
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| Rok vydání: | 2021 |
| Předmět: |
coastal wetlands
Marsh Geography Planning and Development TJ807-830 Wetland Management Monitoring Policy and Law TD194-195 Spartina alterniflora Renewable energy sources invasive species Phragmites Land reclamation GE1-350 Hydrology Spartina geography geography.geographical_feature_category Environmental effects of industries and plants biology Renewable Energy Sustainability and the Environment Soil carbon biology.organism_classification seawalls Environmental sciences salt marsh wetland reclamation alien plant invasion climate change Salt marsh Environmental science |
| Zdroj: | Sustainability Volume 13 Issue 22 Sustainability, Vol 13, Iss 12740, p 12740 (2021) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su132212740 |
| Popis: | The introduction of embankment seawalls to limit the expansion of the exotic C4 perennial grass Spartina alteniflora Loisel in eastern China’s coastal wetlands has more than doubled in the past decades. Previous research focused on the impact of sea embankment reclamation on the soil organic carbon (C) and nitrogen (N) stocks in salt marshes, whereas no study attempted to assess the impact of sea embankment reclamation on greenhouse gas (GHG) fluxes in such marshes. Here we examined the impact of sea embankment reclamation on GHG stocks and fluxes of an invasive Spartina alterniflora and native Phragmites australis dominated salt marsh in the Dongtai wetlands of China’s Jiangsu province. Sea embankment reclamation significantly decreased soil total organic C by 54.0% and total organic N by 73.2%, decreasing plant biomass, soil moisture, and soil salinity in both plants’ marsh. It increased CO2 emissions by 38.2% and 13.5%, and reduced CH4 emissions by 34.5% and 37.1%, respectively, in the Spartina alterniflora and Phragmites australis marshes. The coastal embankment wall also significantly increased N2O emission by 48.9% in the Phragmites australis salt marsh and reduced emissions by 17.2% in the Spartina alterniflora marsh. The fluxes of methane CH4 and carbon dioxide CO2 were similar in both restored and unrestored sections, whereas the fluxes of nitrous oxide N2O were substantially different owing to increased nitrate as a result of N-loading. Our findings show that sea embankment reclamation significantly alters coastal marsh potential to sequester C and N, particularly in native Phragmites australis salt marshes. As a result, sea embankment reclamation essentially weakens native and invasive saltmarshes’ C and N sinks, potentially depleting C and N sinks in coastal China’s wetlands. Stakeholders and policymakers can utilize this scientific evidence to strike a balance between seawall reclamation and invasive plant expansion in coastal wetlands. |
| Databáze: | OpenAIRE |
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