<i>Spartina alterniflora</i> invasion controls organic carbon stocks in coastal marsh and mangrove soils across tropics and subtropics
نویسندگان
چکیده
Coastal wetlands are among the most productive ecosystems and store large amounts of organic carbon (C)—the so termed “blue carbon.” However, in tropics subtropics have been invaded by smooth cordgrass (Spartina alterniflora) affecting storage blue C. To understand how S. alterniflora affects soil (SOC) stocks, sources, stability, their spatial distribution, we sampled soils along a 2500 km coastal transect encompassing tropical to subtropical climate zones. This included 216 samplings within three wetland types: marsh (Phragmites australis) two mangroves (Kandelia candel Avicennia marina). Using ?13C, C:nitrogen (N) ratios, lignin biomarker composition, traced changes SOC response invasion. The contribution alterniflora-derived C up 40 cm accounts for 5.6%, 23%, 12% P. australis, K. candel, A. marina communities, respectively, with corresponding change +3.5, ?14, ?3.9 t ha?1. did not follow trend aboveground biomass from native invasive species, or vegetation types invasion duration (7–15 years). decreased increasing mean annual precipitation (1000–1900 mm) temperature (15.3–23.4?). Edaphic variables australis marshes remained stable after invasion, hence, effects on content were absent. In mangrove wetlands, however, electrical conductivity, total N phosphorus, pH, active silicon main factors controlling stocks. Mangrove strongly impacted efforts needed focus restoring vegetation. By understanding mechanisms consequences alterniflora, sequestration can be predicted optimize developed.
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ژورنال
عنوان ژورنال: Global Change Biology
سال: 2021
ISSN: ['1365-2486', '1354-1013']
DOI: https://doi.org/10.1111/gcb.15516