Diel and seasonal patterns of soil CO2 efflux in a temperate tidal marsh
| Autor: | Margaret Capooci, Rodrigo Vargas |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Biogeochemical cycle
Environmental Engineering Marsh 010504 meteorology & atmospheric sciences Wetland Atmospheric sciences 01 natural sciences Soil respiration Blue carbon Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences geography Spartina geography.geographical_feature_category biology 04 agricultural and veterinary sciences biology.organism_classification Pollution 6. Clean water 13. Climate action Salt marsh 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Spatial variability |
| Zdroj: | Science of The Total Environment. 802:149715 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2021.149715 |
| Popis: | Tidal marshes store large amounts of carbon; however, little is known about the patterns, magnitudes, and biophysical drivers that regulate CO2 efflux from these ecosystems. Due to harsh environmental conditions (e.g., flooding), it is difficult to measure continuous soil CO2 efflux in tidal marshes. These data are necessary to inform empirical and process-based models and to better quantify carbon budgets. We performed automated (30 min) and manual (bi-monthly) soil CO2 efflux measurements, for ~20 months, at two sites in a temperate tidal marsh: tall Spartina (TS; dominated by S. cynosuroides) and short Spartina (SS; dominated by S. alterniflora). These measurements were coupled with water quality, canopy spectral reflectance, and meteorological measurements. There were no consistent diel patterns of soil CO2 efflux, suggesting a decoupling of soil CO2 efflux with diel variations in temperature and tides (i.e., water level) showing a hysteresis effect. Mean soil CO2 efflux was significantly higher at SS (2.15 ± 1.60 μmol CO2 m−2 s−1) than at TS (0.55 ± 0.80 μmol CO2 m−2 s−1), highlighting distinct biogeochemical spatial variability. At the annual scale, air temperature explained >50% of the variability in soil CO2 efflux at both sites; and water level and salinity were secondary drivers of soil CO2 efflux at SS and TS, respectively. Annual soil CO2 efflux varied from 287-876 to 153-211 g C m−2 y−1 at SS and TS, respectively, but manual measurements underestimated the annual flux by |
| Databáze: | OpenAIRE |
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