Search results for: Lee A. Vierling

Items from 1 to 20 out of 46 results

article

Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce

Stephanie C. Schmiege, Kevin L. Griffin, Natalie T. Boelman, Lee A. Vierling, more

Plant, Cell & Environment > 46 > 1 > 45 - 63

Light availability drives vertical canopy gradients in photosynthetic functioning and carbon (C) balance, yet patterns of variability in these gradients remain unclear. We measured light availability, photosynthetic CO₂ and light response curves, foliar C, nitrogen (N) and pigment concentrations, and the photochemical reflectance index (PRI) on upper and lower canopy needles of white spruce trees...

article

Variation in White spruce needle respiration at the species range limits: A potential impediment to Northern expansion

Kevin L. Griffin, Zoe M. Griffin, Stephanie C. Schmiege, Sarah G. Bruner, more

Plant, Cell & Environment > 45 > 7 > 2078 - 2092

White spruce (Picea glauca) spans a massive range, yet the variability in respiratory physiology and related implications for tree carbon balance at the extremes of this distribution remain as enigmas. Working at both the most northern and southern extents of the distribution range more than 5000 km apart, we measured the short‐term temperature response of dark respiration (R/T) at upper and lower...

article

Remote sensing tracks daily radial wood growth of evergreen needleleaf trees

Jan U. H. Eitel, Kevin L. Griffin, Natalie T. Boelman, Andrew J. Maguire, more

Global Change Biology > 26 > 7 > 4068 - 4078

Relationships between gross primary productivity (GPP) and the remotely sensed photochemical reflectance index (PRI) suggest that time series of foliar PRI may provide insight into climate change effects on carbon cycling. However, because a large fraction of carbon assimilated via GPP is quickly returned to the atmosphere via respiration, we ask a critical question—can PRI time series provide information...

article

Taxonomic, functional, and phylogenetic diversity of bird assemblages are oppositely associated to productivity and heterogeneity in temperate forests

Soyeon Bae, Jörg Müller, Dowon Lee, Kerri T. Vierling, more

Remote Sensing of Environment > 2018 > 215 > C > 145-156

Conserving multiple facets of biodiversity is important for sustaining ecosystems. However, understanding relationships between faunal diversity and measurable ecosystem quantities, such as heterogeneity and productivity, across continental scales can be complicated by disparate methods. We developed standardized approaches using lidar data and spectral greenness data (via NDVI; Normalized Difference...

article

Potential trajectories of old‐growth Neotropical forest functional composition under climate change

Adina Chain‐Guadarrama, Pablo Imbach, Sergio Vilchez‐Mendoza, Lee A. Vierling, more

Ecography > 41 > 1 > 75 - 89

Quantifying relationships between plant functional traits and abiotic gradients is valuable for evaluating potential responses of forest communities to climate change. However, the trajectories of change expected to occur in tropical forest functional characteristics as a function of future climate variation are largely unknown. We modeled community level trait values of Costa Rican rain forests as...

article

An automated method to quantify crop height and calibrate satellite-derived biomass using hypertemporal lidar

Jan U.H. Eitel, Troy S. Magney, Lee A. Vierling, Heather E. Greaves, more

Remote Sensing of Environment > 2016 > 187 > C > 414-422

Crop biomass information is of great importance for a variety of applications, ranging from supporting farm management decisions to modeling the crop-environment system. Dimensionless spectral vegetation index values derived from satellite imagery are commonly used to derive crop biomass. However, the highly empirical nature of spectrally derived biomass estimates requires frequent and costly calibration...

article

Mapping a ‘cryptic kingdom’: Performance of lidar derived environmental variables in modelling the occurrence of forest fungi

Maiju Peura, Ramiro Silveyra Gonzalez, Jörg Müller, Marco Heurich, more

Remote Sensing of Environment > 2016 > 186 > C > 428-438

Fungi are crucial to forest ecosystem function and provide important provisioning, regulating, supporting, and cultural ecosystem services. As major contributors to biomass decomposition, fungi are important to forest biogeochemical cycling and maintenance of vertebrate animal diversity. Many forest plant species live in a symbiotic relationship with a fungal partner that helps a host plant to acquire...

article

Beyond 3-D: The new spectrum of lidar applications for earth and ecological sciences

Jan U.H. Eitel, Bernhard Höfle, Lee A. Vierling, Antonio Abellán, more

Remote Sensing of Environment > 2016 > 186 > C > 372-392

Capturing and quantifying the world in three dimensions (x,y,z) using light detection and ranging (lidar) technology drives fundamental advances in the Earth and Ecological Sciences (EES). However, additional lidar dimensions offer the possibility to transcend basic 3-D mapping capabilities, including i) the physical time (t) dimension from repeat lidar acquisition and ii) laser return intensity (LRI...

article

Landsat 8 and ICESat-2: Performance and potential synergies for quantifying dryland ecosystem vegetation cover and biomass

Nancy F. Glenn, Amy Neuenschwander, Lee A. Vierling, Lucas Spaete, more

Remote Sensing of Environment > 2016 > 185 > C > 233-242

The Landsat 8 mission provides new opportunities for quantifying the distribution of above-ground carbon at moderate spatial resolution across the globe, and in particular drylands. Furthermore, coupled with structural information from space-based and airborne laser altimetry, Landsat 8 provides powerful capabilities for large-area, long-term studies that quantify temporal and spatial changes in above-ground...

article

High-resolution mapping of aboveground shrub biomass in Arctic tundra using airborne lidar and imagery

Heather E. Greaves, Lee A. Vierling, Jan U.H. Eitel, Natalie T. Boelman, more

Remote Sensing of Environment > 2016 > 184 > C > 361-373

Accurate monitoring of climate-driven expansion of low-stature shrubs in Arctic tundra requires high-resolution maps of shrub biomass that can accurately quantify the current baseline over relevant spatial and temporal extents. In this study, our goal was to use airborne lidar and imagery to build accurate high-resolution shrub biomass maps for an important research landscape in the American Arctic...

article

Mapping wheat nitrogen uptake from RapidEye vegetation indices

Troy S. Magney, Jan U. H. Eitel, Lee A. Vierling

Precision Agriculture > 2017 > 18 > 4 > 429-451

Mapping wheat nitrogen (N) uptake at 5 m spatial resolution could provide growers with new insights regarding nitrogen-use efficiency at the field scale. This study explored the use of spectral information from high resolution (5 × 5 m) RapidEye satellite data at peak leaf area index (LAI) to estimate end-of-season cumulative N uptake of wheat (Triticum spp.) in a heterogeneous, rainfed system. The...

article

LiDAR canopy radiation model reveals patterns of photosynthetic partitioning in an Arctic shrub

Troy S. Magney, Jan U.H. Eitel, Kevin L. Griffin, Natalie T. Boelman, more

Agricultural and Forest Meteorology > 2016 > 221 > C > 78-93

Characterizing the wide range of light availability and photosynthetic properties throughout a plant canopy is important for modeling the exchanges of carbon, water, and nutrients between the biosphere and the atmosphere. Such characterization could be especially important in one of the world's most rapidly changing biomes – the Arctic tundra – where further warming-induced increases in the size,...

article

Proximal NDVI derived phenology improves in-season predictions of wheat quantity and quality

Troy S. Magney, Jan U.H. Eitel, David R. Huggins, Lee A. Vierling

Agricultural and Forest Meteorology > 2016 > 217 > C > 46-60

Automated, low-cost and field-deployable remote sensing tools are well suited for continuously monitoring crop growth and providing growers with timely information about crop performance. Because automated sensors provide information about crop development and performance across time, we examined the hypothesis that ground-based canopy reflectance data might define crop phenology in new ways over...

article

Response of high frequency Photochemical Reflectance Index (PRI) measurements to environmental conditions in wheat

Troy S. Magney, Lee A. Vierling, Jan U.H. Eitel, David R. Huggins, more

Remote Sensing of Environment > 2016 > 173 > C > 84-97

Remotely sensed data that are sensitive to rapidly changing plant physiology can provide real-time information about crop responses to abiotic conditions. The Photochemical Reflectance Index (PRI) has shown promise when measured at short timesteps to remotely estimate dynamics in xanthophyll pigment interconversion — a plant photoprotective mechanism that results in lowered photosynthetic efficiency...

article

Spectral determination of concentrations of functionally diverse pigments in increasingly complex arctic tundra canopies

Natalie T. Boelman, Troy S. Magney, Barry A. Logan, Kevin L. Griffin, more

Oecologia > 2016 > 182 > 1 > 85-97

As the Arctic warms, tundra vegetation is becoming taller and more structurally complex, as tall deciduous shrubs become increasingly dominant. Emerging studies reveal that shrubs exhibit photosynthetic resource partitioning, akin to forests, that may need accounting for in the “big leaf” net ecosystem exchange models. We conducted a lab experiment on sun and shade leaves from S. pulchra shrubs to...

article

Establishing conservation baselines with dynamic distribution models for bat populations facing imminent decline

Thomas J. Rodhouse, Patricia C. Ormsbee, Kathryn M. Irvine, Lee A. Vierling, more

Diversity and Distributions > 21 > 12 > 1401 - 1413

AimBat mortality rates from white‐nose syndrome and wind power development are unprecedented. Cryptic and wide‐ranging behaviours of bats make them difficult to survey, and population estimation is often intractable. We advance a model‐based framework for making spatially explicit predictions about summertime distributions of bats from capture and acoustic surveys. Motivated by species‐energy and...

article

Estimating aboveground biomass and leaf area of low-stature Arctic shrubs with terrestrial LiDAR

Heather E. Greaves, Lee A. Vierling, Jan U.H. Eitel, Natalie T. Boelman, more

Remote Sensing of Environment > 2015 > 164 > C > 26-35

Arctic tundra ecosystems are responding to effects of climatic warming via shifts in vegetation composition and increased woody biomass. In this sensitive ecosystem, minor increases in woody plant biomass may induce significant changes in ecosystem structure and function. However, establishing methods for quantifying and potentially scaling woody plant biomass in low-stature biomes is challenging...

article

Coupled social and ecological outcomes of agricultural intensification in Costa Rica and the future of biodiversity conservation in tropical agricultural regions

Irene Shaver, Adina Chain-Guadarrama, Katherine A. Cleary, Andre Sanfiorenzo, more

Global Environmental Change > 2015 > 32 > C > 74-86

Tropical ecosystem conversion to agriculture has caused widespread habitat loss and created fragmented landscapes composed of remnant forest patches embedded in a matrix of agricultural land uses. Non-traditional agricultural export (NTAE) crops such as pineapple are rapidly replacing multiuse landscapes characterized by a diverse matrix of pasture and smallholder crops with intensive, large-scale,...

article

Throughfall heterogeneity in tropical forested landscapes as a focal mechanism for deep percolation

P. Zion Klos, Adina Chain-Guadarrama, Timothy E. Link, Bryan Finegan, more

Journal of Hydrology > 2014 > 519 > PB > 2180-2188

Forest structure can both reduce and intensify precipitation inputs to the ground surface at fine spatial scales. Areas of localized input at the soil surface may have large effects on deep drainage because of the strongly nonlinear relationship between soil water content (SWC) and unsaturated hydraulic conductivity. We therefore explored the following questions: Does forest structure that creates...

article

Assessment of crop foliar nitrogen using a novel dual-wavelength laser system and implications for conducting laser-based plant physiology

Jan U.H. Eitel, Troy S. Magney, Lee A. Vierling, Günter Dittmar

ISPRS Journal of Photogrammetry and Remote Sensing > 2014 > 97 > Complete > 229-240

Advanced technologies for improved nitrogen (N) fertilizer management are paramount for sustainably meeting future food demands. Green laser systems that measure pulse return intensity can provide more reliable information about foliar N than can traditional passive remote sensing devices during the critical early crop growth stages (e.g., before canopy closure when vegetation and soil signals are...

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INFONA - science communication portal

Search results for: Lee A. Vierling

Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce

Variation in White spruce needle respiration at the species range limits: A potential impediment to Northern expansion

Remote sensing tracks daily radial wood growth of evergreen needleleaf trees

Taxonomic, functional, and phylogenetic diversity of bird assemblages are oppositely associated to productivity and heterogeneity in temperate forests

Potential trajectories of old‐growth Neotropical forest functional composition under climate change

An automated method to quantify crop height and calibrate satellite-derived biomass using hypertemporal lidar

Mapping a ‘cryptic kingdom’: Performance of lidar derived environmental variables in modelling the occurrence of forest fungi

Beyond 3-D: The new spectrum of lidar applications for earth and ecological sciences

Landsat 8 and ICESat-2: Performance and potential synergies for quantifying dryland ecosystem vegetation cover and biomass

High-resolution mapping of aboveground shrub biomass in Arctic tundra using airborne lidar and imagery

Mapping wheat nitrogen uptake from RapidEye vegetation indices

LiDAR canopy radiation model reveals patterns of photosynthetic partitioning in an Arctic shrub

Proximal NDVI derived phenology improves in-season predictions of wheat quantity and quality

Response of high frequency Photochemical Reflectance Index (PRI) measurements to environmental conditions in wheat

Spectral determination of concentrations of functionally diverse pigments in increasingly complex arctic tundra canopies

Establishing conservation baselines with dynamic distribution models for bat populations facing imminent decline

Estimating aboveground biomass and leaf area of low-stature Arctic shrubs with terrestrial LiDAR

Coupled social and ecological outcomes of agricultural intensification in Costa Rica and the future of biodiversity conservation in tropical agricultural regions

Throughfall heterogeneity in tropical forested landscapes as a focal mechanism for deep percolation

Assessment of crop foliar nitrogen using a novel dual-wavelength laser system and implications for conducting laser-based plant physiology

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