326-4 Net Ecosystem CO2 Exchange in a Subtropical Oxisol Under Long-Term Tillage Systems.

Poster Number 1148

See more from this Division: S06 Soil & Water Management & Conservation
See more from this Session: Conservation Practices to Mitigate the Effects of Climate Change: II
Wednesday, November 3, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Telmo Amado1, Debora Roberti1, Osvaldo Moraes1, Rodrigo Nicoloso1 and Jackson Fiorin2, (1)Department of Soils, Federal University of Santa Maria, Santa Maria-RS, Brazil
(2)FUNDACEP, Cruz Alta-RS, Brazil
Agricultural soils can act as a source or sink of CO2 depending on the management practices adopted. The objective of this research was to evaluate the net ecosystem CO2 exchange in long-term soil management systems (convetional tillage (CT) and no-till (NT)) over a subtropical Hapludox in southern Brazil. Data were collected by an automatic meteorological station mounted in micrometeorological tower two meters above the ground. Turbulent variables were measured by a three-dimensional sonic anemometer Campbell-3D (wind and temperature components) and by an infrared gas analyzer Licor 7500 (H2O e CO2). Eddy covariance method was employed to measure the C-CO2 exchange that resulted of the interaction between atmosphere and the soybean cropping system. Soil temperature was measured using two sensors (thermopar) installed in the soil and for moisture measurement were used two sensors ECH2O.
See more from this Division: S06 Soil & Water Management & Conservation
See more from this Session: Conservation Practices to Mitigate the Effects of Climate Change: II