HR: 1400h
AN: B13A-02    [Abstracts]
TI: The Effect Of Soil Moisture Content And Nitrogen And Phosphorous Addition On The Production Of CO₂ And N₂O In A Mature Red Spruce (Picea rubens Sarg.) Forest Soil
AU: Kellman, L
EM: lkellman@stfx.ca
AF: Environmental Sciences Research Centre, St. Francis Xavier University, Physical Sciences Complex PO Box 5000, Antigonish, NS B2G 2W5, Canada
AU: * Diochon, A
EM: adiochon@stfx.ca
AF: Environmental Sciences Research Centre, St. Francis Xavier University, Physical Sciences Complex PO Box 5000, Antigonish, NS B2G 2W5, Canada
AB: Temperature, moisture and nutrient availability are key controls on the production of CO₂ and N₂O in the soil and all are altered when a system is perturbed by land management activities. Though the effect of temperature on production has been well characterized, the effects of moisture and nutrients on the production of CO₂ and N₂O are lesser known. This study examines the effects of soil moisture content and nutrient availability on the production of CO₂ and N₂O in the top 50 cm of mineral soil collected from a mature red spruce forest. To evaluate the effects of moisture and nutrients on the production of CO₂ and N₂O, we measured production of CO₂ and N₂O in an aerobic laboratory incubation conducted at 21 C. In a full factorial design, soils collected from four depth intervals (0-5, 5-20, 20-35, and 35- 50 cm) were adjusted to four water contents (30, 50, 75 and 100% water holding capacity) and amended with nitrogen, phosphorous or both. We compare the effects of the treatments on rates of production of CO₂ and N₂O to determine if the relative control of these factors on production differs with depth. The findings of this study suggest that the relative control of moisture and nutrient availability on production of CO₂ and N₂O differ within the soil profile, indicating the need for taking a multi-factor approach to understanding changes in greenhouse gas production from the soil in a managed system.
DE: 0400 BIOGEOSCIENCES
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0469 Nitrogen cycling
SC: Biogeosciences [B]
MN: 2009 Joint Assembly