A5036953411- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Fire effects on ecosystems
- Atmospheric and Environmental Gas Dynamics
- Fermentation and Sensory Analysis
- Soil Carbon and Nitrogen Dynamics
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Seedling growth and survival studies
- Tree-ring climate responses
- Plant responses to elevated CO2
- Plant and animal studies
- Climate variability and models
- Metabolomics and Mass Spectrometry Studies
- Rangeland and Wildlife Management
- Atmospheric chemistry and aerosols
- Forest Management and Policy
- Conservation Techniques and Studies
- Advanced Chemical Sensor Technologies
- Plant Pathogens and Fungal Diseases
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- Plant Physiology and Cultivation Studies
- Horticultural and Viticultural Research
Cornell University
2009-2021
University of Colorado Boulder
2001-2002
Abstract We studied net ecosystem CO 2 exchange (NEE) dynamics in a high‐elevation, subalpine forest Colorado, USA, over two‐year period. Annual carbon sequestration for the was 6.71 mol C m −2 (80.5 g ) year between November 1, 1998 and October 31, 1999, 4.80 (57.6 1999 2000. Despite its evergreen nature, did not exhibit uptake during winter, even periods of favourable weather. The largest fraction annual occurred early growing‐season; first 30 days both years. Reductions rate after were...
Abstract The impacts of drought are expanding worldwide as a consequence climate change. However, there is still little knowledge how species respond to long‐term selection in seasonally dry ecosystems. In this study, we used Q ST ‐ F comparisons investigate (i) the role natural on population genetic differentiation for set functional traits related resistance tropical oak Quercus oleoides and (ii) influence water availability at site origin experimental treatments patterns trait divergence....
Widely distributed species are normally subjected to spatial heterogeneity in environmental conditions. In sessile organisms like plants, adaptive evolution and phenotypic plasticity of key functional traits the main mechanisms through which can respond climate change. While extended research has been carried out temperate this regard, there is still limited knowledge as how from seasonally-dry tropical climates temporal variation fact, intraspecific genetically-based differences within...
Abstract Arid soils represent a substantial carbonate pool and may participate in surface‐atmosphere CO 2 exchange via diel cycle of dissolution exsolution. We used Keeling plot approach to determine the substrate δ 13 C emitted from carbonate‐dominated Mojave desert found evidence for nonrespiratory source that increased with surface temperature. In dry at 25–30°C, had values −19.4 ± 4.2‰, indicative respiration organic material (soil matter = −23.1 0.8‰). flux temperature; maximum fluxes...
Reducing soil nutrient availability has been proposed as a strategy to favor native vs. non‐native invasive plant species and represents potential alternative traditional manual removal or chemical control methods. We implemented field experiment in invaded dry wet montane Hawaiian ecosystems test responses of dominant three treatments (Control = no manipulation; Carbon C substrate added reduce nutrients; Fertilizer fertilizer increase nutrients) two (Weeds removed; Weeds present) fully...
[1] In arid regions, emissions of nitrogen (N) gases are important to long-term soil fertility and regional atmospheric chemistry, making alterations in N gas an aspect ecosystem response climate change. Studies at the Nevada Desert FACE Facility suggest that rising CO2 concentrations impact ecosystems dynamics Mojave Desert; our objective was identify whether those responses translate into changes trace emissions. We measured fluxes reactive (NO, NOy, NH3) N2O plots receiving fumigation...
Isotopic methods have proven to be a powerful analytical tool for the determination of origin and authenticity wine. In addition, measuring stable isotope ratio provides useful information detection many illegal practices in production The determinations composition compounds are based on relative ratios using mass spectrometry. This article describes new isotopic method δD value non-exchangeable hydrogen isotopes ethanol investigating adulteration wine making. With this method, we able...
In early 1990's European Union has established new isotopic approach for detection of wine authenticity. this article we setup the possibility using EIM – Module IRMS (Ethanol Isotope Measurement Ratio Mass Spectrometry) instrumental technique and analytical parameter δD n (δ 2 H ) ethanol value, which represents δ value non-exchangeable hydrogen stable isotope ratio in ethanol, with other species 18 O values water) to improve illegal production practices such as addition sugar and/or...
In two Costa Rican and three Honduran sites that vary in rainfall soil properties, we used natural isotopes, a water balance model, broad-scale climate-based drought indices to study shifts use with ontogeny from seedlings mature tropical live oak (Quercus oleoides) trees. Water patterns help explain persistence of this broadly distributed species Mesoamerica evaluate likely threats ongoing climate changes. At the end dry season, δ18 O profiles can be described by one-phase exponential decay...
ISHS IX International Symposium on Integrating Canopy, Rootstock and Environmental Physiology in Orchard Systems HYBRIDIZING 'MCINTOSH WIJCIK' AND HEAT-TOLERANT APPLE CULTIVARS TO DEVELOP PRECOCIOUS SEEDLING TREES WITH IMPROVED TREE ARCHITECTURE