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The Mississippi River Deltaic Plain has extensive marsh habitats (fresh, intermediate, brackish, and saline) where soil cores were collected to a depth of 100 cm at 24 sites to assess long-term carbon accumulation rates and coast-wide burial rates. Each core was sectioned into 2-cm depth intervals, and select intervals were analyzed for percent moisture, bulk density, total carbon, and radionuclide (137Cs and 210Pb).
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Vegetation and elevation survey data were collected in 4-square-meter quadrats via Real-Time Kinematic GPS from September 9, 2018 to April 17, 2019 on Dauphin Island, AL. Vegetation data included total percent herbaceous cover, percent cover by plant species, and mean height of vegetation within the quadrat. The percent cover by species was used to determine the dominant species for the plot.
Categories: Data;
Tags: Botany,
Dauphin Island,
Ecology,
Geography,
Geomorphology, All tags...
Mobile,
USGS Science Data Catalog (SDC),
barrier flat,
barrier islands,
beach,
biota,
coastal wetlands,
dune,
elevation,
environment,
geoscientificInformation,
marsh,
meadow,
topography,
vegetation,
woody vegetation, Fewer tags
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This dataset provides information on plant sexual reproduction of a clonally-spreading perennial species, Spartina alterniflora. We investigated flowering phenology, potential seed and seedling production, and flower damage in reference and restored sites in southeastern Louisiana. Additional covariates of elevation and soil parameters were used to investigate underlying mechanisms of differences.
Categories: Data;
Tags: Botany,
Ecology,
Louisiana,
Port Fourchon,
USGS Science Data Catalog (SDC), All tags...
biota,
flowering,
germination,
phenology,
sexual reproduction, Fewer tags
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We characterized coastal wetland responses to flooding stress by measuring vegetation cover, wetland elevation and water elevation in healthy and degrading wetlands dominated by Spartina patens. Wetland elevation was measured using real-time kinematic survey methods. Vegetation cover was determined by visual estimation methods, and water elevation was measured using in situ continuous recorders. In addition to these local-scale responses, we also measured landscape-scale patterns of land and water aggregation or fragmentation using remotely sensed data (Jones et al., 2018). Associated products: Jones, W.R., Hartley, S.B., Stagg, C.L., and Osland, M.J. 2018. Land-water classification for selected sites in McFaddin...
Categories: Data;
Tags: Grand Chenier,
Land Use Change,
Texas,
USGS Science Data Catalog (SDC),
aggregation, All tags...
ecological threshold,
flooding,
habitat fragmentation,
hydrologic characteristics of habitats,
wetlands, Fewer tags
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Short-term carbon accumulation rates were examined by collecting 10-cm deep soil cores at 24 sites located in marshes spanning the salinity gradient in coastal Louisiana. Percent moisture, bulk density, total carbon content, and the short-term accretion rates obtained with feldspar horizon markers were measured to determine total carbon accumulation and storage rates.
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