Effects of Nitrogen and Calcium on Photosynthesis and Metabolic Activity in Acer Saccharum in the Catskill Mountains
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چکیده
Title of Document: EFFECTS OF NITROGEN AND CALCIUM ON PHOTOSYNTHESIS AND METABOLIC ACTIVITY IN ACER SACCHARUM IN THE CATSKILL MOUNTAINS. Shawna Joy Behling Directed By: Associate Professor Dr. Joseph Sullivan Plant Sciences and Landscape Architecture The Catskill Mountains in southern New York have received some of the most acidic rainfall in the country for the past 50 years. Acid deposition on these thin soils may deplete the concentration of calcium and other ions in the soil solution and mobilize other ions that can be harmful to sugar maple (Acer saccharum) rooting systems. The effects of fertilizers on the metabolism and photosynthesis rates of sugar maple are of great interest to both farmers and ecologists. In this study, 12 plots in a 60-year-old sugar maple dominated forest were treated with no fertilizer, nitrogen, calcium, or nitrogen and calcium together. Photosynthesis was measured with a LiCor 6400. Metabolic heat rate was measured with a MC-DSC calorimeter. While some sampling periods showed significant responses to some treatments, the study as a whole suggests the addition of calcium and/or nitrogen had minimal effects on photosynthesis or metabolism. EFFECTS OF NITROGEN AND CALCIUM ON PHOTOSYNTHESIS AND METABOLIC ACTIVITY IN ACER SACCHARUM IN THE CATSKILL MOUNTAINS
منابع مشابه
Photosynthetic and Growth Response of Sugar Maple (Acer saccharum Marsh.) Mature Trees and Seedlings to Calcium, Magnesium, and Nitrogen Additions in the Catskill Mountains, NY, USA
Decline of sugar maple in North American forests has been attributed to changes in soil calcium (Ca) and nitrogen (N) by acidic precipitation. Although N is an essential and usually a limiting factor in forests, atmospheric N deposition may cause N-saturation leading to loss of soil Ca. Such changes can affect carbon gain and growth of sugar maple trees and seedlings. We applied a 22 factorial ...
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