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|Degree||PhD in NRES (Applied Ecology)|
244 North Hardin Hall
3310 Holdrege Street
|Bumann, E., Awada, T. N., Wardlow, B., Hayes, M. J., Okalebo, J., Helzer, C., Mazis, A., Hiller, J., Cherubini, P. (in press). Assessing responses of Betula papyrifera to climate variability in a remnant population along the Niobrara River Valley in Nebraska through dendroecological and remote sensing techniques. Canadian Journal of Forest Research.|
- Presentation Type: Team Presentation
- Date: 12/15/2018
With the advent of multiple global satellite Solar-Induced Fluorescence (SIF) products, experimental studies are needed to elucidate the factors controlling SIF emission from vegetation across temporal and spatial scales. Of particular interest is the functional link between SIF and pigment states, photosynthetic activity, and canopy structure, each of which are known to influence the SIF signal. Additional issues arise from multiple measurement approaches among the research community, which can include different instrumentation, fore-optics, measurement scales, and retrieval methods that affect the measured SIF signal, leading to uncertainty in estimates of gross primary productivity (GPP) from SIF. To address these issues, we introduce an ongoing SIF field campaign at the University of Nebraska's carbon sequestration research fields. The study is located at an AmeriFlux Core Site located at the Eastern Nebraska Research and Extension Center (ENREC) near Mead Nebraska. We present initial results of field experiments conducted in 2017 and 2018 over the research area. The study combines multiple automated and mobile ground-based instruments from several research institutions with airborne SIF and reflectance retrievals over irrigated and rain-fed maize and soybean fields, pastures, and shelterbelts, providing a valuable dataset for testing SIF instrumentation and methods. Initial results indicate general agreement with diurnal and seasonal GPP patterns in some cases. However, notable differences emerge between instruments, sampling scales, sampling geometry, and retrieval methods. Our research clearly indicates the importance of clearly defining SIF measurement protocols across research teams. SIF groups must work to standardize methods, normalize for stand structure and sampling protocols, and characterize sources of error and uncertainty for SIF retrievals.
- Full Citation: Gamon, J. A., Suyker, A., Walter-Shea, E. A., Arkebauer, T. J., Zygielbaum, A. I., Franz, T., ... & Yu, R. (2018, December). The Nebraska SIF Campaign-a Multi-Scale Field Experiment. In AGU Fall Meeting Abstracts.
- Presentation Type: Poster Presentation
- Date: 12/15/2017
High throughput plant phenotyping is increasingly being used to assess morphological and biophysical traits of economically important crops in agriculture. In this study, the potential application of this technique in natural resources management, through the characterization of woody plants regeneration, establishment, growth, and responses to water and nutrient manipulations was assessed. Two woody species were selected for this study, Quercus prinoides and Quercus bicolor. Seeds were collected from trees growing at the edge of their natural distribution in Nebraska and Missouri, USA. Seeds were germinated in the greenhouse and transferred to the Nebraska Innovation Campus Lemnatec3D High Throughput facility at the University of Nebraska-Lincoln. Seedlings subjected to water and N manipulations, were imaged twice or three times a week using four cameras (Visible, Fluorescence, Infrared and Hyperspectral), throughout the growing season. Traditional leaf to plant levels ecophysiological measurements were concurrently acquired to assess the relationship between these two techniques. These include gas exchange (LI 6400 and LI 6800, LICOR Inc., Lincoln NE), chlorophyll content, optical characteristics (Ocean Optics USB200), water and osmotic potentials, leaf area and weight and carbon isotope ratio. In the presentation, we highlight results on the potential use of high throughput plant phenotyping techniques to assess the morphology and physiology of woody species including responses to water availability and nutrient manipulation, and its broader application under field conditions and natural resources management. Also, we explore the different capabilities imaging provides us for modeling the plant physiological and morphological growth and how it can complement the current techniques
- Full Citation: Mazis, A., Hiller, J., Morgan, P., Awada, T., & Stoerger, V. (2017, December). Assessing Morphological and Physiological Properties of Forest Species Using High Throughput Plant Phenotyping and Imaging Techniques. In AGU Fall Meeting Abstracts.
- 2019 – Arthur W. Sampson Fellowship awarded by UNL-IANR/Center for Grassland Studies
- 2016 – NCERA Travel Award awarded by NCERA/USDA
Currently this page only displays grants that were awarded on 1/1/2009 to the present. If a grant was awarded prior to 1/1/2009 and is still active, it will not be displayed on this page.There no Grants found for this selection.