Printer Friendly

Changes of hyperspectral reflectance and photosynthesis in Ambrosia dumosa following supplemental nitrogen additions.

71 CHANGES OF HYPERSPECTRAL REFLECTANCE AND PHOTOSYNTHESIS IN AMBROSIA DUMOSA FOLLOWING SUPPLEMENTAL NITROGEN ADDITIONS

Anthropogenic nitrogen deposition has been increasing in the Mojave desert region due to downwind transport of urban and coastal nitrogen emissions. We examined the possibility of using soil nutrient concentration, photosynthetic gas-exchange and hyperspectral reflectance responses of ambrosia dumosa leaves as a proxy to determine if air pollution is resulting in unnatural fertilization of the Mojave region. Expected nitrogen deposition levels were administered to plants in both field and greenhouse studies. Using ground-based spectroscopy techniques and photosynthetic response curves, a number of metrics for plant physiological function were evaluated. From hyperspectral spectroscopy we determined that nutrient addition has resulted in physiological impacts, but not in the direction expected (i.e. control group showed overall "healthier" values that for fertilized plants). However, there was no significant difference of photosynthesis between control and fertilized groups, thus the changes in reflectance properties may be unrelated to photosynthesis. Further studies are needed to determine the functional significance of reflectance changes, but they nonetheless hold promise for use as proxies to identify alterations in natural soil nutrient concentrations within this human-impacted ecosystem.

A. Cohodas, T. Reilly and D.R. Sandquist. California State University Fullerton, Department of Biological Science, Fullerton, CA, 92834

COPYRIGHT 2014 Southern California Academy of Sciences
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2014 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:POSTER SESSION ABSTRACTS IN PROGRAM ORDER
Author:Cohodas, A.; Reilly, T.; Sandquist, D.R.
Publication:Bulletin (Southern California Academy of Sciences)
Article Type:Report
Date:Aug 1, 2014
Words:210
Previous Article:Distribution and growth estimates of young-of-the-year giant sea bass, Stereolep1s gigas, off southern California.
Next Article:Characterization of sugar diversity in floral and extra floral nectar from the coastal coral tree (Erythrina caffra thunb.) in southern California.
Topics:

Terms of use | Privacy policy | Copyright © 2019 Farlex, Inc. | Feedback | For webmasters