Effects of Nitrate Supply on Uptake and Root Respiration in White Pine Seedlings. (S07-lucash873942-poster)
Authors:
M.S. Lucash* - SUNY-ESF J.M. Scholberg - U. Florida R.D. Yanai - SUNY-ESF
J.D. Joslin - Belowground Forest Research
Abstract:
Although energy derived from root respiration is utilized for nitrogen uptake, few studies have simultaneously measured root respiration and nitrate uptake. In this study, root respiration and nitrate uptake were measured in white pine seedlings grown in soil-uptake-monitoring (SUM) columns filled with sand. To determine how nutrient supply affects respiratory costs, nitrate uptake and root
respiration were measured in plants grown at low and high nitrate supply. Nitrate uptake was measured by filling columns with a known volume and concentration of nutrient solution. After 2hrs, the solution was removed by a vacuum pump and analyzed for nitrate. During the uptake measurements, root respiration was measured in the column headspace using a LI-COR 6400. Measurements were repeated using a range of nutrient concentrations.
Speaker Information: Melissa Lucash, SUNY-ESF, Dept of Forestry, 211 Marshall Hall, SUNY-ESF, Syracuse, NY 13210; Phone: 315-470-4850; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 3:00 PM-5:00 PM Presentation Start: 3:00 PM (Poster Board Number: 1510)