A5080890067- Soil Carbon and Nitrogen Dynamics
- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Fire effects on ecosystems
- Radioactive element chemistry and processing
- Thermochemical Biomass Conversion Processes
- Ion-surface interactions and analysis
- Mass Spectrometry Techniques and Applications
- Analytical chemistry methods development
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Geochemistry and Elemental Analysis
- Geology and Paleoclimatology Research
- Coal and Its By-products
- Isotope Analysis in Ecology
- Plasma Diagnostics and Applications
- Ecology and Vegetation Dynamics Studies
- Atmospheric chemistry and aerosols
- Thermal and Kinetic Analysis
- NMR spectroscopy and applications
- Radioactivity and Radon Measurements
- Rangeland and Wildlife Management
- Seedling growth and survival studies
- Hydrocarbon exploration and reservoir analysis
- Chemical Thermodynamics and Molecular Structure
Hiden Analytical (United Kingdom)
2003-2021
University of Michigan
2015-2018
Queens College, CUNY
2014-2018
City University of New York
2018
Institut National de la Recherche Agronomique
2015
Interactions Arbres-Microorganismes
2012
Oregon State University
2011
Direct observations of processes occurring at the mineral-organic interface are increasingly seen as relevant for cycling both natural soil organic matter and contaminants in soils sediments. Advanced analytical tools with capability to visualize characterize submicrometer scale, such Nano Secondary Ion Mass Spectrometry (NanoSIMS) Scanning Transmission X-ray Microscopy (STXM) coupled Near Edge Absorption Fine Structure Spectroscopy (NEXAFS), may be combined locate mineral-associated matter....
While plant litters are the main source of soil organic matter (SOM) in forests, controllers and pathways to stable SOM formation remain unclear. Here, we address how litter type ((13) C/(15) N-labeled needles vs. fine roots) placement-depth (O A horizon) affect situ C N dynamics a temperate forest after 5 years. Litter rather than controlled retention years situ, with belowground root inputs greatly enhancing (x1.4) (x1.2) compared aboveground needles. proportions added needle root-derived...
Abstract. Physical fractionation is a widely used methodology to study soil organic matter (SOM) dynamics, but concerns have been raised that the available methods do not well describe functional SOM pools. In this we explore whether physical techniques isolate compartments in meaningful and functionally relevant way for investigation of litter-derived nitrogen dynamics at decadal timescale. We so by performing aggregate density (ADF) particle size-density (PSDF) on mineral samples from two...
RATIONALE Nano‐scale secondary ion mass spectrometry (NanoSIMS) is still hampered by a lack of appropriate calibration method for the quantification elemental and isotopic ratios in heterogeneous materials such as soil samples. The potential 13 C‐ 15 N‐labeled density fractions to calibrate C/N, C/ 12 C N/ 14 N provided NanoSIMS was evaluated. METHODS spatial organization particles found at macro‐ micro‐scales were compared. measured macroscopic scale from different using an analyzer coupled...
Tree taxa and pyrolysis temperature are the major controllers of physicochemical properties resultant pyrogenic organic matter (PyOM) produced in fire-prone forests. However, we know little about how these controls determine residence time PyOM once introduced to soil. In this study, tracked fate 13C-enriched red maple (RM) or jack pine (JP) wood PyOM, over a range temperatures (200, 300, 450, 600 °C) added soil from northern temperate forest Michigan, USA. Pyrolysis was main controller...
Abstract. Physical fractionation is a widely used methodology to study soil organic matter (SOM) dynamics, but concerns have been raised that the available methods do not well describe functional SOM pools. We also examine question whether physical techniques isolate ecologically meaningful, functionally relevant compartments. In this we explore kind of information aggregate density (ADF) and particle size-density (PSDF) yield on OM dynamics method-specific, similar, or complimentary. so by...
Zusammenfassung Schwellenwert‐Ionisations‐Massenspektrometrie (TIMS) – Sanfte Ionisierung für verbesserte Selektivität in Echtzeit Die hat sich als Technik zur Verbesserung von Standardmethoden der Restgasanalyse etabliert, insbesondere wenn die dominanten Peaks im Massenspektrum bei nahezu gleichem Masse/Ladungs‐Verhältnis auftreten. Massenpeaks sind dann mit Standard‐Quadrupol‐Massenspektrometrie‐Methoden schwer zu trennen. Es werden mehrere Anwendungen beschrieben, denen TIMS sehr...
Forest soil fertility is generally estimated by studying the water and nutrient cycles essential to living organisms (i.e. biogeochemical cycles). Use of geochemical and/or isotopic tracers an innovative, complementary approach more traditional studies. Experimental procedures results some recent studies in forest ecosystems using natural (e.g. 18O, 13C, 26Mg) or artificially supplied enrichment Sr, Rb, 15N, 44Ca, 26Mg, 32P) are presented. Results discussed terms relevance for these tools...
La fertilité des sols forestiers est généralement estimée par l'étude cycles de l'eau et éléments nutritifs essentiels aux êtres vivants (cycles biogéochimiques). Parmi l'ensemble méthodes d'étude ces cycles, une approche innovante, complémentaire études plus classiques, consiste à utiliser traceurs géochimiques ou isotopiques. Les démarches expérimentales résultats quelques récentes dans le domaine, utilisant naturellement présents les écosystèmes (ex. 18O, 13C, 26Mg) artificiellement...