A5055022439- Soil and Water Nutrient Dynamics
- Coastal wetland ecosystem dynamics
- Soil Carbon and Nitrogen Dynamics
- Soil erosion and sediment transport
- Geology and Paleoclimatology Research
- Peatlands and Wetlands Ecology
- Soil Geostatistics and Mapping
- Hydrology and Watershed Management Studies
- Soil and Unsaturated Flow
- Clay minerals and soil interactions
- Groundwater and Isotope Geochemistry
- Mine drainage and remediation techniques
- Iron oxide chemistry and applications
- Rangeland and Wildlife Management
- Geochemistry and Elemental Analysis
- Urban Stormwater Management Solutions
- Hydrology and Sediment Transport Processes
- Geochemistry and Geologic Mapping
- Coastal and Marine Dynamics
- Aeolian processes and effects
- Marine and coastal plant biology
- Marine Biology and Ecology Research
- Wastewater Treatment and Reuse
- Heavy metals in environment
- Geological formations and processes
University of Rhode Island
2013-2023
Louisiana Department of Natural Resources
2002-2023
Kingston University
2005-2015
Virginia Tech
1991-2013
Cary Institute of Ecosystem Studies
2001
ABSTRACT: Inherent site factors can generate substantial variation in the ground water nitrate removal capacity of riparian zones. This paper examines research glaciated Northeast to relate variability attributes depicted readily available spatial databases, such as SSUIRGO. Linking site‐specific studies data help target high‐value locations for restoration or protection and improve modeling watershed nitrogen flux. Site attributes, hydric soil status (soil wetness) geomorphology, affect...
Marshes in the urban Jamaica Bay Estuary, New York, USA are disappearing at an average rate of 13 ha/yr, and multiple stressors (e.g., wastewater inputs, dredging activities, groundwater removal, global warming) may be contributing to marsh losses. Among these stressors, nutrients suspected important cause deterioration. We used census data, radiometric dating, stable nitrogen isotopes, soil surveys examine temporal relationships between human population growth nitrogen; we evaluated...
Soil C supplies vary spatially within and among riparian wetlands. Understanding this variability is essential to assessments of C‐dependent wetland functions such as water quality enhancement storage. In study, we examined the distribution with depth across landscape. Our objectives were describe spatial various forms in subsurface wetlands, identify watershed, landscape, soil characteristics that govern these forms. Twenty‐two sites, mapped alluvial or outwash soils, along first‐ through...
ABSTRACT The ground water denitrification capacity of riparian zones in deep soils, where substantial can flow through low‐gradient stratified sediments, may affect watershed nitrogen export. We hypothesized that the vertical pattern hydric soils varies with geomorphic setting and follows expected subsurface carbon distribution (i.e., abrupt decline depth glacial outwash vs. negligible alluvium). measured situ rates at three depths (65, 150, 300 cm) within four sites (two per setting) using...
Tidal Marshes are wetland ecosystems at the marine-terrestrial interface which serve as strong sinks for atmospheric carbon dioxide and large reservoirs of soil organic (SOC). However, tidal marsh soils also produce emit potent greenhouse gas methane (CH4). Previous work has demonstrated that CH4 flux is inversely related to salinity, negligible compared (CO2) uptake in marshes with salinities >18 parts per thousand (ppt). lower salinity marshes, highly variable, can spike sharply...
ABSTRACT The capacity of riparian zones to serve as critical control locations for watershed nitrogen flux varies with site characteristics. Without a means stratify into different levels ground water nitrate removal capacity, this variability will confound spatially explicit source–sink models and limit efforts target restoration management. We examined the capability SSURGO (1:15840 Soil Survey Geographic database) map classifications (slope class, geomorphology, and/or hydric soil...
Soil organic matter (SOM) contains fractions that range from very active to passive, relative microbial‐driven ecosystem processes and functions. A classification system is needed can test the hypothesis SOM be separated by morphology into functionally meaningful fractions. The objectives of this study were use macro‐ micromorphological techniques classify various C forms present in saturated (or seasonally saturated) subsurface horizons hydric riparian soils, increase our understanding...
In order to effectively study, manage, conserve, and sustain shallow-subtidal ecosystems, a spatial inventory of the basic resources habitats is essential. Because complexities substrates, benthic communities, geology, geomorphology, water column attributes, few standard protocols are fully articulated tested that describe mapping processes accompanying interpretations. this paper, we systematic approach map Rhode Island's coastal lagoon by using, integrating, reconciling multiple data sets...
Riparian zones are important catchment‐scale depositional environments that receive episodic influx of sediment and C from watershed sources. The specific impacts upland disturbances on riparian soil development organic carbon (SOC) dynamics still largely unknown. goal our study was to understand the role soils in retaining at landscape catchment scales. We quantified SOC pools a depth 1 m 29 headwater sites southern New England. ranged 117 495 Mg ha −1 , with mean pool 246 . On average,...
Relationships between soil development and parent material or landscape position can often be hidden confounded by variability. Variability in particle size elemental composition was examined soils within four representative toposequences Virginia. The objectives were to partition total variability, describe lateral variability horizons of the same pedon, evaluate uniformity. Total partitioned among study sites, positions, horizons, random effects. attributed minimal (<8%), suggesting that...
Subaqueous soils occur from the lower limit of intertidal zone to a depth <2.5 m in protected estuarine coves, bays, inlets, and lagoons. These support diverse floral faunal assemblage are vital component ecosystem. Only recently have pedologists considered these substrates soil, thus, very few subaqueous been characterized relationships between associated subtidal landforms unknown. In this study, we investigated shallow‐subtidal settings within 116‐ha area Rhode Island estuary. Our...
Understanding the effects of land use on riparian systems is dependent upon development methodologies to recognize changes in sedimentation related shifts use. Land trends southern New England consist from forested precolonial conditions, colonial and agrarian uses, toward modern industrial-urban landscapes. The goals this study were develop a set stratigraphic indices that reflect these periods illustrate their applications. Twenty-four sites first- second-order watersheds chosen for study....
Wetlands are complex ecosystems having considerable spatial variability. Understanding soil relationships in wetlands is difficult because of the number factors that affect properties. We established a nested sampling design within five small, forested and scrub‐shrub palustrine Virginia to examine variability among sites. Sampling was based on relative elevation intervals each wetland depth unit. Soils were analyzed determine nutrient status, pH, organic C content, particle‐size...