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The Effects of Slope on Tree Well Shape and Sub- Nivean Access Points

The Effects of Slope on Tree Well Shape and Sub- Nivean Access Points. Paige Pruisner EBIO 4100 Winter Ecology, Spring 2013 Mountain Research Station University of Colorado Boulder. How Does Slope Angle Effect Tree Well Shape and Sub- Nivean Burrowing?. Snow. Change Snow Pack. Burrow.

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The Effects of Slope on Tree Well Shape and Sub- Nivean Access Points

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  1. The Effects of Slope on Tree Well Shape and Sub-Nivean Access Points Paige Pruisner EBIO 4100 Winter Ecology, Spring 2013 Mountain Research Station University of Colorado Boulder

  2. How Does Slope Angle Effect Tree Well Shape and Sub-Nivean Burrowing? Snow Change Snow Pack Burrow Insulation Trees Mammals

  3. Field Methods Upslope Quadrant Upslope Radius Left Quadrant Right Quadrant Tree Upslope Half Downslope Half Right Radius Left Radius Tree Well Downslope Radius Downslope Quadrant

  4. Y Data Analysis X Y X where a, b, c, d, are any number

  5. P=0.365

  6. Discussion • Circularity vs. Slope Angle • Continuity • Steeper slopes • Wind • Burrowing preference • No advantage

  7. Other Observations

  8. Conclusions • Insignificant relationship between slope angle and tree well circularity • Insignificant relationship between tree well circularity and access point location • Insignificant relationship between slope angle and access point location • Further research into steeper slopes, wind and forest density effects, hole shape, pathways between trees Acknowledgements: Dr. Tim Kittel and Derek Sweeney for equipment and advising

  9. Bibliography Decker, K. L. M., D. Wang, C. Waite, T. Scherbatskoy (2003), Snow Removal and Ambient Air Temperature Effects on Forest Soil Temperatures in Northern Vermont, Soil Sci. Soc. Am. J., 2003 67: 1234–1242, doiL 10.2136/sssaj2003.1234. Hardy, J. P., R. E. Davis, R. Jordan, X. Li, C. Woodcock, W. Ni, and J. C. McKenzie (1997), Snow ablation modeling at the stand scale in a boreal jack pine forest, J. Geophys. Res., 102(D24),29397–29405, doi:10.1029/96JD03096. Merritt, J. F., Lima, M. and Bozinovic, F. (2001), Seasonal regulation in fluctuating small mammal populations: feedback structure and climate. Oikos, 94: 505–514. doi: 10.1034/j.1600-0706.2001.940312.x Sturm, M., "Snow distribution and heat flow in the taiga" (1992). Aspen Bibliography. Paper 2488.http://digitalcommons.usu.edu/aspen_bib/2488

  10. Appendix

  11. Bibliography

  12. How Does Slope Angle Effect Tree Well Shape and Sub-Nivean Burrowing? • Snow • Insulates (Decker et al., 2003) • Non-uniform distribution (Sturm, 1992) • Trees • Modify snow pack (Hardy et al., 1997) • Mammals • Shelter (Merritt, 2001)

  13. How Does Slope Angle Effect Tree Well Shape and Sub-Nivean Burrowing? Snow Change Snow Pack Covers Burrow Insulation Reproduction/Distribution Trees Mammals Shelter, Food

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