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Post-Disturbance Trends in Soil Respiration: Impact of Forestry Management Strategies on Sierra Nevada Forests

This study examines soil respiration rates post-forestry management in Sierra Nevada old-growth forests. Different treatments were applied to assess their effects on soil respiration recovery over three years after disturbance. The impact of burning and thinning on soil respiration is analyzed through a comprehensive factorial design. Key findings include the significant decrease in soil respiration following burning in certain patches and the increase due to thinning. Understanding these trends is crucial for sustainable forest management.

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Post-Disturbance Trends in Soil Respiration: Impact of Forestry Management Strategies on Sierra Nevada Forests

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  1. Post-disturbance trends in soil respiration from 1 to 3 years after forestry management Amy Concilio, Lab Meeting 12/3/04

  2. 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

  3. 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

  4. Methods

  5. 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

  6. 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

  7. 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

  8. Mean SRR by Year

  9. Mean Annual SRR by Treatment Type Treatments

  10. Inter-annual variation by treatment

  11. Mean SRR by patch type and treatment from 2000 to 2004 (by actual disturbance)

  12. ANOVA Results

  13. Effects of Burning and Thinning

  14. % change in SRR from treatment to control [(TRT-UN)/UN *100%] Treatments

  15. 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

  16. Effect of Burning on SRR

  17. Effect of Thinning on SRR

  18. Combined effect of burning and thinning on SRR

  19. 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

  20. SRR vs Litter Depth SRR (gCO2 m-2 hr-1) Litter Depth (cm)

  21. Thank you for your help!!!!

  22. Mean SRR by patch type and treatment from 2000 to 2004 (by actual disturbance)

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