A5081798082- Coastal wetland ecosystem dynamics
- Soil and Water Nutrient Dynamics
- Peatlands and Wetlands Ecology
- Coastal and Marine Dynamics
- Constructed Wetlands for Wastewater Treatment
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Soil Carbon and Nitrogen Dynamics
- Geology and Paleoclimatology Research
- Wastewater Treatment and Reuse
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Oceanographic and Atmospheric Processes
- Pharmaceutical and Antibiotic Environmental Impacts
- Groundwater and Isotope Geochemistry
- Heavy metals in environment
- Wastewater Treatment and Nitrogen Removal
- Phosphorus and nutrient management
- Geological formations and processes
- Microbial Community Ecology and Physiology
- Hydrocarbon exploration and reservoir analysis
- Insect-Plant Interactions and Control
- Isotope Analysis in Ecology
Louisiana State University
2016-2025
Shanghai Ocean University
2009
College of Marin
2009
Boston University
2009
Organisation de Coopération et de Développement Economiques
2008
New Mexico State University
2006
UK Centre for Ecology & Hydrology
2002-2005
University of Florida
1999-2004
Florida Institute of Technology
1993
NOAA Air Resources Laboratory
1992
The highly visible coastal phenomenon of wetland loss in Louisiana (LA) was examined through the prism carbon accumulation and loss. Carbon storage or sequestration rapidly subsiding LA marsh soils based on vertical accretion aerial change data. Marshes sequester significant amount however, large amounts previously soil profile is lost annual deterioration these marshes. Hurricanes, such as Katrina Rita, have triggered instantaneous losses sequestered destruction areas marsh. This analysis...
Phosphorus (P) retention in wetlands is an important function of watershed nutrient cycling, particularly drainage basins with significant nonpoint contributions from agriculture and urban sources. storage involves complex interrelated physical, chemical, biological processes that ultimately retain P organic inorganic forms. Both short-term mediated by assimilation into vegetation, translocation within above- below-ground plant tissues, microorganisms, periphyton, detritus, long-term...
The natural isotopic abundances of the following elements have been determined by mass spectrometric techniques: Different masses were focused variation magnetic flux in Nier-type, 60\ifmmode^\circ\else\textdegree\fi{} spectrometers. Ion currents measured potentiometrically. Each measurement represents at least 15 determinations. Many measurements are averages series with different spectrometers and ion sources. From available packing fraction data these chemical atomic weights computed.
The mobility of water soluble cobalt (Co), nickel (Ni), selenium (Se), and vanadium (V) was determined in fluvial (F) lacustrine (L) soils used for rice (Oryza sativa L.) production the northern portion Egyptian Nile Delta. impact redox potential (EH), soil pH, dissolved organic carbon (DOC), aromatic compounds (DAC), iron (Fe), manganese (Mn), sulfate (SO42−) on dynamics studied metals quantified suspensions using an automated biogeochemical microcosm apparatus. experiment conducted...
Roberts, H.H.; DeLaune, R.D.; White, J.R.; Li, C.; Sasser, C.E.; Braud, D.; Weeks, E., and Khalil, S., 2015. Floods cold front passages: Impacts on coastal marshes in a river diversion setting (Wax Lake delta area, Louisiana).Diversion of the Mississippi River is considered most effective way offsetting Louisiana's plain land loss. The Wax delta, man-made that represents mostly sand-rich distributary mouth bar deposits, cited as model for building from large diversion. fine-grained suspended...
The seperation and analysis of additives in polymers. NMR. Characterization Vibrational spectroscopy. Molecular weight determination. Chromatographic methods. Thermal analysis. Small angle neutron scattering reflectometry. Mechanical rheological testing. Polymer microscopy. characterization polymer surfaces by XPS SIMS.
There have been recent concerns about the anthropogenic phosphorus (P) loading to naturally oligotrophic Everglades ecosystem. We investigated effect of P on biogeochemical cycling nitrogen (N). distribution potentially mineralizable N (PMN) rate as an indicator influence selected microbial activities in soil and detritus layers. Soil characteristics measured included bulk density; total C, N, P; biomass C; extractable NH + 4 PMN rates ranged from 10.4 325 mg kg −1 d The highest values C P,...
There has been recent concern about the impact of increased nutrient loading on northern Everglades ecosystem. We investigated spatial and temporal distribution denitrifying enzyme activity (DEA) along a P‐enrichment gradient in Water Conservation Area 2A (WCA‐2A) determined effects added P NO − 3 DEA. The DEA soil detritus layers was measured under anaerobic conditions four times during 2 yr, using acetylene blockage technique. ranged from 0.004 to 7.75 mg N O–N kg −1 h Highest rates were...
The Davis Pond freshwater diversion is intended to help restore Louisiana's coastal wetlands by reintroducing Mississippi River water Barataria Basin. We hypothesized that the high NO 3 − concentration (2.0 mg –N L −1 ) of would control rate denitrification in receiving marsh given soils are saturated, anaerobic, and contain C. Therefore, areas enzyme activity (DEA) represent exposed river actively involved denitrification. Data from 88 soil samples (0–10 cm) collected throughout revealed...
Future conditions of coastal Louisiana are highly uncertain due to the dynamic nature deltas, climate change, tropical storms, and human reliance on natural resources ecosystem services. Managing a system in which socio-economic components integrated is inherently difficult. Sediment diversions unique restoration tool that would reconnect Mississippi River its deltaic plain build sustain land. Diversions innately adaptable as operations can be modified over time. An expert working group was...
Abstract Tidal flats form around the estuarine and coastal zone by continuous terrigenous sediment transport deposition processes. Now a large body of published carbon research work frame within vegetated area (mangrove forests, sea grass bed, salt marshes). Nonvegetated tidal flats, which are characterized predominantly silts clays sediment, were generally impressed with low stock due to their meager primary productivity. However, these regions may be potentially important sink, given high...