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Spatial Heterogeneity in a Managed Forest in the Missouri Ozarks

Spatial Heterogeneity in a Managed Forest in the Missouri Ozarks. Rachel Henderson, Qinglin Li, Jiquan Chen Department of Earth, Ecological and Environmental Sciences The University of Toledo Randy Jensen Missouri Department of Conservation. Acknowledgements.

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Spatial Heterogeneity in a Managed Forest in the Missouri Ozarks

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  1. Spatial Heterogeneity in a Managed Forest in the Missouri Ozarks Rachel Henderson, Qinglin Li, Jiquan Chen Department of Earth, Ecological and Environmental Sciences The University of Toledo Randy Jensen Missouri Department of Conservation

  2. Acknowledgements • Funding: Missouri Department of Conservation • Qinglin Li, Jiquan Chen, and Xiaoli Cheng • Field Assistants: Taylor Troiani, Lori Schimtz, and Charity Barnes • LEES Lab members

  3. Questions • Does timber harvest treatment alter soil respiration rate spatial heterogeneity? • Does the temporal heterogeneity of soil respiration in a managed forest change?

  4. Soil Respiration Heterogeneity • Understanding nutrient and SOM dynamics • Assessing the contribution of soil respiration in global carbon budget • Guiding sampling design decisions Stoyan et al. 2000

  5. Spatial / Temporal Distribution • Defined by the overlapping distributions of substrates, soil physical conditions, soil organisms, temperature and moisture conditions (Stoyan et al. 2000) • Determined by geostatistics (a tool to describe spatial phenomenon)

  6. Sill Semivariance Nugget Range Distance Semivariogram Global Variance Microscale Variance Error Patch size (Brosenbrock 2005)

  7. Reynolds Shannon Carter Management Types Even age (EAM) Uneven age (UAM) No harvest (NHM) 10 Kilometers MOFEP

  8. 1m 10m 10m 1m 100m Transects NHM 500m UAM & EAM 300m

  9. Equipment Allegro Deleted values<10 EGM4 Deleted values>5

  10. Nugget 2004

  11. Nugget 2005

  12. Sill 2004

  13. Sill 2005

  14. SRR Range 2004

  15. SRR Range 2005

  16. Leaf Depth Range 2005

  17. Temperature Range 2004

  18. Temperature Range 2005

  19. Moisture Content Range 2004

  20. Moisture Content Range 2005

  21. Soil temperature and moisture may explain season variation • Root biomass, microbial biomass, litter amount, soil organic carbon, soil N, cation exchange capacity, soil bulk density, soil porosity, pH and site topography might explain spatial variation (Epron et al. 2004)

  22. NHM 2004

  23. NHM 2005

  24. EAM 2004

  25. EAM 2005

  26. UAM 2004

  27. UAM 2005

  28. Conclusions • Soil respiration rate increased in 2005 • Harvesting decreased spatial heterogeneity • Litter depth explained this decrease

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