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Post-disturbance trends in soil respiration from 1 to 3 years after forestry management. Amy Concilio, Lab Meeting 12/3/04. Teakettle Experimental Forest. Sierra Nevada Mixed Conifer old-growth forest, Mediterranean climate Treatments: Unburned, Uncut (UN) Unburned, CASPO thin (UC)
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Post-disturbance trends in soil respiration from 1 to 3 years after forestry management Amy Concilio, Lab Meeting 12/3/04
Teakettle Experimental Forest • Sierra Nevada Mixed Conifer old-growth forest, Mediterranean climate • Treatments: • Unburned, Uncut (UN) • Unburned, CASPO thin (UC) • Unburned, Shelterwood thin (US) • Burned, Uncut (BN) • Burned, CASPO thin (BC) • Burned, Shelterwood thin (BS) • Sampling: • Full factorial design • Points selected by Patch*Treatment combinations • 54 points
Objectives • To determine how each management strategy affected SRR for the first 3 years post- disturbance • To compare SRR response to each management strategy • To compare the drivers of SRR between management regimes and years
Past Research (Ma et al. 2003) • Paired t-test • ANOVA • SRR= f [year, treatment (year), patch (year) patch(treatment)] • GLM • SRR= f (patch, burn, thin, burn*thin) • Pearson/ Spearman Correlations • Stepwise Regression
1 year post-treatment findings(Ma et al. 2003) • Burning significantly decreased SRR in CECO patches • Thinning significantly increased SRR in CECO patches • SRR in CC and OC patches did not significantly change
Objectives • To determine how each management strategy affected SRR for the first 3 years post- disturbance • To compare SRR response to each management strategy • To compare the drivers of SRR between management regimes and years
Mean Annual SRR by Treatment Type Treatments
Mean SRR by patch type and treatment from 2000 to 2004 (by actual disturbance)
% change in SRR from treatment to control [(TRT-UN)/UN *100%] Treatments
Objectives • To determine how each management strategy affected SRR for the first 3 years post- disturbance • To compare SRR response to each management strategy • To compare the drivers of SRR between management regimes and years
Objectives • To determine how each management strategy affected SRR for the first 3 years post- disturbance • To compare SRR recovery times of various management strategies • To compare the drivers of SRR between management regimes and years
SRR vs Litter Depth SRR (gCO2 m-2 hr-1) Litter Depth (cm)
Mean SRR by patch type and treatment from 2000 to 2004 (by actual disturbance)