91761 Temperature Adjustments of Chamber-Based Flux Measurements.

See more from this Division: Workshops
See more from this Session: Measuring Nitrous Oxide Emissions from Soils: Methodology, Instrumentation, Modeling, Data Stewardship and Analysis

Thursday, November 19, 2015: 9:30 AM
Hilton Minneapolis, Marquette Ballroom I-II

Tim Parkin, USDA-ARS, Ames, IA
Abstract:
Diurnal temperature variations can influence soil N2O emissions.  Because chamber-based N2O measurements are typically short term in nature, biased estimates of daily emissions can be obtained, depending upon the time of day the measurements are taken.  This work evaluates the potential temperature-induced biases associated daily N2O emissions estimates.   Application of the Q10 coefficient can be used adjust point-in-time measurements to daily averages.  However, a number of factors must be considered, including:  the value of the Q10 coefficient, and the source (i.e. soil depth) of the temperatures to be used in the correction.  An evaluation of these factors is presented, and recommendations are provided.

See more from this Division: Workshops
See more from this Session: Measuring Nitrous Oxide Emissions from Soils: Methodology, Instrumentation, Modeling, Data Stewardship and Analysis