PARENT SESSION
Poster Session # 13: Biogeochemistry, Photosynthesis, and Respiration.
Tuesday, August 5 Presentation from 5:00 PM to 6:30 PM. SITCC Exhibit Hall B.
Comparison of methods to estimate annual soil respiration in a mid-latitude deciduous forest.
Wayson, Craig*,1, Randolph, JC1, Schmid, Hans Peter1, 1 Indiana University, Bloomington, Indiana
ABSTRACT- The single largest component in the calculation of net CO2 flux from mid-latitude deciduous forests is the flux from forest floor and soil respiration; however, accurate measurements of this flux are difficult. Since May, 1998 at the AmeriFlux site in Morgan-Monroe State Forest (MMSF), located in south-central Indiana, we have made periodic (usually monthly) measurements of soil respiration using portable instruments in plots with differing topography. These data allow spatial comparison but are limited temporally. However, since September, 2001 soil respiration has been measured continuously using an automated chamber system. The data are limited to a single location near the flux tower, but the CO2 flux, soil moisture, soil temperature, air temperature, and precipitation data are continuous. Estimates of seasonal and annual soil respiration rates for 2002 made by direct measurement using the chamber system are compared with estimates generated by eddy covariance flux measures and estimates made using a simple model and spatially specific data from the portable system.
Key words: carbon dynamics, forest ecology, soil respiration