A5039924259- Forest ecology and management
- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest Management and Policy
- Fire effects on ecosystems
- Soil Carbon and Nitrogen Dynamics
- Atmospheric and Environmental Gas Dynamics
- Ecology and Vegetation Dynamics Studies
- Remote Sensing and LiDAR Applications
- Seedling growth and survival studies
- Bioenergy crop production and management
- Spacecraft and Cryogenic Technologies
- Hydrology and Watershed Management Studies
- Forest Biomass Utilization and Management
- Plant responses to elevated CO2
- Climate variability and models
- Maritime Security and History
- Plant and animal studies
- Forest Ecology and Biodiversity Studies
- Insect and Arachnid Ecology and Behavior
- Tree Root and Stability Studies
- Soil and Unsaturated Flow
- Remote Sensing in Agriculture
- Astro and Planetary Science
- Plant responses to water stress
University of Florida
2015-2024
Elon University
2024
Corteva (United States)
2024
Ottawa Research and Development Centre
2019-2023
Agriculture and Agri-Food Canada
2015-2023
Child & Family Service
2006-2018
Southern Research Station
2010-2017
Martin University
2013-2015
Queen's University Belfast
2014
Agri Food and Biosciences Institute
2014
Disturbances are important for renewal of North American forests. Here we summarize more than 180 site years eddy covariance measurements carbon dioxide flux made at forest chronosequences in America. The disturbances included stand‐replacing fire (Alaska, Arizona, Manitoba, and Saskatchewan) harvest (British Columbia, Florida, New Brunswick, Oregon, Quebec, Saskatchewan, Wisconsin) events, insect infestations (gypsy moth, tent caterpillar, mountain pine beetle), Hurricane Wilma,...
The availability of nitrogen represents a key constraint on carbon cycling in terrestrial ecosystems, and it is largely this capacity that the role N Earth's climate system has been considered. Despite this, few studies have included continuous variation plant status as driver broad-scale cycle analyses. This partly because uncertainties how leaf-level physiological relationships scale to whole ecosystems methods for regional continental detection concentrations yet be developed. Here, we...
Genomic selection can increase genetic gain per generation through early selection. is expected to be particularly valuable for traits that are costly phenotype and expressed late in the life cycle of long-lived species. Alternative approaches genomic prediction models may perform differently with distinct properties. Here performance four different original methods differ respect assumptions regarding distribution marker effects, including (i) ridge regression-best linear unbiased...
Abstract. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, carbon budgets at the land–atmosphere interface. However, despite being main land evaporative flux global scale, its response environmental drivers are currently not well constrained by observations. Here we introduce first compilation whole-plant data from sap flow measurements (SAPFLUXNET, https://sapfluxnet.creaf.cat/, last access: 8 June 2021). We harmonized...
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric dioxide because potential accelerating effects positive climate–carbon cycle feedbacks. However, directly observed CO2 with atmosphere across biomes continents are lacking. Here we present data describing net ecosystem (NEE) factors as measured using eddy covariance method at 125 unique sites in various over six a total 559 site-years. We find that...
DOI: 10.1111/j.1469-8137.2009.02856.x Commentary p 783
Abstract A commitment to long-term forest research provides the basis and opportunity understand developmental processes stand dynamics over an entire rotation. The southeastern United States has undergone a significant evolution in management practices last 60 years, especially regard intensification of pine plantation silviculture. However, few studies have examined production relationships for This article reviews results from rotation-length experiment that tested factorial combinations...
• It is well established that individual organisms can acclimate and adapt to temperature optimize their functioning. However, thermal optimization of ecosystems, as an assemblage organisms, has not been examined at broad spatial temporal scales. Here, we compiled data from 169 globally distributed sites eddy covariance quantified the response functions net ecosystem exchange (NEE), ecosystem-level property, determine whether NEE shows optimality explore underlying mechanisms. We found...
Summary Nitrogen fertilization induces dramatic changes in the growth and development of plants, including forest trees. In this study we examined short‐term responses hybrid poplar, Populus balsamifera ssp. trichocarpa × deltoides , to N fertilization. Glasshouse‐grown saplings subjected limiting, intermediate, luxuriant levels ammonium nitrate over a 28 d time course demonstrated rapid whole‐plant architecture biomass accumulation. Nitrogen‐associated shifts allocation occurred temporally...
The effects of ontogeny and soil nutrient supply on aboveground biomass accumulation, allocation, stemwood growth efficiency loblolly (Pinus taeda L.) slash pine elliottii Engelm. var. elliottii) were investigated in north-central Florida over 16 years using a 2 × factorial experiment (species, fertilization, weed control). Aboveground responses to the combined fertilizer control treatments (FW) averaged ~2- 2.8-fold for pine, respectively. In same treatment, annual needlefall (NF)...
We used three methods to measure boundary layer conductance heat transfer (g(bH)) and water vapor (g(bV)) in foliated branches of Abies amabilis Dougl. ex J. Forbes, a subalpine forest tree that produces clumped shoot morphology on sun-formed branches. Boundary conductances estimated the field from energy balance measurements increased linearly approximately 10 mm s(-1) at low wind speeds (< 0.1 m s(-1)) over 150 2.0 s(-1). measured models tunnel were consistently higher than measurements....
We quantified fire-driven loss and post-fire recovery of understory soil carbon (C) nutrient pools for one to three years following a single prescribed fire in naturally regenerated longleaf (Pinus palustris Mill.) slash pine elliottii Engelm. var. elliottii) forest located north central Florida. Fire immediately reduced total aboveground C nitrogen (N) pools, but these recovered pre-fire levels after years. Our results also showed that the effect on composition structure was only...
Abstract We used eddy covariance and biomass measurements to quantify the carbon (C) dynamics of a naturally regenerated longleaf pine/slash pine flatwoods ecosystem in north Florida for 4 years, July 2000 June 2002 2004 2005, how forest type, silvicultural intensity environment influence stand‐level C balance. Precipitation over study periods ranged from extreme drought (July 2000–June 2002) above‐average precipitation (2004 2005). After photosynthetic photon flux density (PPFD), vapor...
Collaborations to address complex societal problems associated with managing human-natural systems often require large teams comprised of scientists from multiple disciplines.For many such problems, large-scale, transdisciplinary projects whose members include scientists, stakeholders, and other professionals are necessary.The success very large, can be facilitated by attending the diversity types collaboration that inevitably occur within them.As progress evolve, resulting dynamic...
Planted pine forests (plantations) in the southeastern United States are an important component of continent's carbon balance. Forest dynamics affected by a range factors including climatic variability. Multiyear droughts have region past, and increase frequency drought events has been predicted. How this increased variability will affect capacity region's plantations to sequester is not known. We used eddy covariance biometric approaches measure over nine years two slash ( Pinus elliottii...
Synthetic aperture radar (SAR) is more sensitive to the dielectric properties and structure of targets less affected by weather conditions than optical sensors, making it capable detecting changes induced management practices in agricultural fields. In this study, capability C-band SAR data for crop seeding harvest events was explored. The study conducted 2019 growing season Temiskaming Shores, an area Northern Ontario, Canada. Time-series acquired Sentinel-1 constellation with...