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Assessing the Interannual Variation in Vegetative Response to Climate in Spring Valley, NV

Assessing the Interannual Variation in Vegetative Response to Climate in Spring Valley, NV. Lorenzo Apodaca 2/13/12. Effects of climate change. Lengthening of growing season Reduction in total winter snow pack Increase in water stress Changes in species composition

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Assessing the Interannual Variation in Vegetative Response to Climate in Spring Valley, NV

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  1. Assessing the Interannual Variation in Vegetative Response to Climate in Spring Valley, NV Lorenzo Apodaca 2/13/12

  2. Effects of climate change Lengthening of growing season Reduction in total winter snow pack Increase in water stress Changes in species composition Shifts in plant ecotones Spread of invasive species

  3. Directly west of GBNP (NE NV) Mainly mixed shrubland Location of one of the towers in Snake Range transect Spring Valley

  4. Goal : Establish empirical relationship between big sagebrush growth ring indices and remotely-sensed NDVI Linking plant growth response to past climate variability Relationship between wood development and seasonal precipitation

  5. 119 stems from within the valley Sample collection complete

  6. Stem Stats • Avg. ring count = 45 (s = 14) • Max. count = 77 • Min. count = 22 • 60% of stems date up to 1970

  7. Skeleton Plot 1974 1989 1996 2007 1959 2002

  8. Average growing season NDVI

  9. Future Work • Ring indices of all 128 sagebrush stems samples and sites • Requires accurate dating of all stem rings • Determine ring signal beyond the site level • Examine relationship between ring indices and NDVI • Between growth/development and climate

  10. Acknowledgements UNLV Advisory Committee Dr. Dale Devitt Dr. Lynn Fenstermaker Dr. Stan Smith Dr. Paul Schulte Devitt Lab Lena Wright Amanda Wagner Brian Bird Special thanks Fred Landau Ely BLM Funded by NSF EPSCoR seed grant

  11. Devitt et al, Ecohydrology 2010.

  12. SV25-2

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