end of October. In 2009, May rates averaged 2.18 CO2 m-2 s-1, peaked at 8.78 CO2 μmol μmol m-2 s-1 in late July and declined to 4.36 CO2 m-2 s-1 by September. In 2010, early μmol growing season respiration rates were 1.63 CO2 m-2 s-1 at the end of April, they increased μmol to 7.79 CO2 m-2 s-1 in mid-July and then declined to 3.15 CO2 m-2 s-1 in μmol μmol September (Fig. 3.2a). Overall, the model in Eqn. 1 accounted for 69% of the variability observed in our soil respiration measurements. There was no indication that slope position influenced soil respiration rates in 2009 but in 2010 the lower slope position had significantly higher soil respiration rates by 0.36 CO2 m-2 s-1 (p < 0.01) compared to the upper slope μmol position. The initial live biomass in 2007 varied between plots from 209 to 300 Mg ha-1. In 2008, the mean change in live aboveground biomass from 2007 to 2008 was +3 % for C (6.1 ± 0.1 Mg ha-1), -9 % for NO (-20.1 ± 6.7 Mg ha-1), -32 % for O50 (-80.9 ± 3.9 Mg ha-1), -73 % for OG (-179.9 ± 7.2 Mg ha-1), and -100 % for ALL (-270.0 Mg ha-1). These values did not vary substantially for the second and third year of the study
end of October. In 2009, May rates averaged 2.18 μmol CO2 m-2 s-1, peaked at 8.78 μmol CO2 m-2 s-1 in late July and declined to 4.36 μmol CO2 m-2 s-1 by September. In 2010, early growing season respiration rates were 1.63 μmol CO2 m-2 s-1 at the end of April, they increased to 7.79 μmol CO2 m-2 s-1 in mid-July and then declined to 3.15 μmol CO2 m-2 s-1 in September (Fig. 3.2a). Overall, the model in Eqn. 1 accounted for 69% of the variability observed in our soil respiration measurements. There was no indication that slope position influenced soil respiration rates in 2009 but in 2010 the lower slope position had significantly higher soil respiration rates by 0.36 μmol CO2 m-2 s-1 (p < 0.01) compared to the upper slope position. The initial live biomass in 2007 varied between plots from 209 to 300 Mg ha-1. In 2008, the mean change in live aboveground biomass from 2007 to 2008 was +3 % for C (6.1 ± 0.1 Mg ha-1), -9 % for NO (-20.1 ± 6.7 Mg ha-1), -32 % for O50 (-80.9 ± 3.9 Mg ha-1), -73 % for OG (-179.9 ± 7.2 Mg ha-1), and -100 % for ALL (-270.0 Mg ha-1). These values did not vary substantially for the second and third year of the study
res_pub_levy-varon_j._below_ground_carbon_pools_dissertation.docx