Research Soil Scientist
Email:
mwaldrop@usgs.gov
Office Phone:
650-714-9294
Fax:
650-329-4920
ORCID:
0000-0003-1829-7140
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Our objective is to improve the scientific understanding of the modes, rates, and mechanisms of carbon stabilization and losses in soils from Alaska, California, and other Western states. We focus on the biophysical and microbial mechanisms that drive carbon gains and losses, and to use our data to improve models of soil carbon cycling. This catalog supports research from several projects focused on soil carbon cycling. It encompasses multiple types of datasets including environmental, ecological, biological, isotopic, mineralogical, genomic, flux, and modeled data from water, vegetation, soil, and atmospheric matrices. The catalog will be available online and to the public. Therefore, publication of data through...
Tags: Alaska,
California,
carbon,
carbon sequestration,
carbon storage, All tags...
genomics,
grasslands,
methane,
microbes,
microbial communities,
minerals,
permafrost,
soil, Fewer tags
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Abstract (from http://onlinelibrary.wiley.com/doi/10.1111/gcb.12875/abstract): Permafrost thaw can alter the soil environment through changes in soil moisture, frequently resulting in soil saturation, a shift to anaerobic decomposition, and changes in the plant community. These changes, along with thawing of previously frozen organic material, can alter the form and magnitude of greenhouse gas production from permafrost ecosystems. We synthesized existing methane (CH 4) and carbon dioxide (CO 2) production measurements from anaerobic incubations of boreal and tundra soils from the geographic permafrost region to evaluate large-scale controls of anaerobic CO 2 and CH 4 production and compare the relative importance...
Categories: Publication;
Types: Citation;
Tags: Alaska CASC,
Alaska CASC,
Glaciers and Permafrost,
Water, Coasts and Ice,
anaerobic incubation, All tags...
arctic,
boreal,
carbon dioxide,
climate change,
methane,
permafrost, Fewer tags
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Surface-based 2D electrical resistivity tomography (ERT) surveys were used to investigate the distribution of permafrost at wetland sites on the alluvial plain north of the Tanana River, 20 km southwest of Fairbanks, Alaska, in June and September 2014. The sites contained habitat types characteristic of interior Alaska, including thermokarst bog, forested permafrost plateau, and a rich fen. These habitats range from treed to open and vary in groundcover vegetation and peat thickness. Individual surveys used a cable with 56 electrodes at 2-m spacing. At a fen site, ERT surveys were performed across a mixed spruce forest area across a vegetation gradient into an open fen area. At a bog site,surveys were performed...
Tags: Alaska,
Bonanza Creek Experimental Forest,
ERT surveying,
Geophysics,
Hydrogeology, All tags...
USGS Science Data Catalog (SDC),
Water Resources,
cryosphere,
electrical resistivity tomography,
permafrost,
resistivity,
time series datasets, Fewer tags
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This dataset is a single comma-delimited text file (.csv). Data include the name of lakes where samples were obtained, the historical dynamics of that lake, the sampled community type, and the dry mass of annual new growth. Shrub community measurements are a combination of understory mass from quadrat harvests and shrub stem mass derived from published allometric equations. This is a child item of the USGS Data Release: https://doi.org/10.5066/P9QF8RR5
Categories: Data;
Tags: Alaska,
Biogeochemical cycles,
Biomass,
Biomass dynamics,
Biota, All tags...
Community ecology,
Community structure,
Ecology,
Environment,
Lake drying,
Landscape ecology,
Plants,
Primary production,
Soil Science,
Soil carbon storage,
Succession (biological),
Terrestrial ecosystems,
USGS Science Data Catalog (SDC),
Vegetation cover,
Wetland ecosystems,
Yukon Flats,
Yukon Flats National Wildlife Refuge, Fewer tags
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