Robert Shriver Dept. of Botany, University of Wyoming

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Presentation transcript:

Fire and Vegetation history of the Pine Forest Range, NV over the past 4,000 years Robert Shriver Dept. of Botany, University of Wyoming Funding: WSGC Undergrad Fellowship

Background Fire is an important and widespread disturbance in western forests Fire histories provide information on the natural range of variability and relationship to climate and vegetation. Short Term - Dendrology Long Term - Lake Sediments http://www.uoregon.edu/%7Edonovan/images/Forest%20Fire.bmp

Research Questions 1. What is the historic range of variability of fire in the Pine Forest Range? 2. How have changes in vegetation interacted with fire regimes?

Blue Lakes Pine forest range, Northwest Nevada Pater Noster series of lakes Coring Lake: 9 meters deep

Reconstructing fire history from lake sediments Reconstructing fire history from lake sediments. Reconstructing fire history from lake sediments. In the upper part: charcoal production, transport and deposition in lacustrine sediments (including taphonomy); In the lower part: paleofire-regime reconstruction by [1] charcoal collection (sampling techniques and procedures), [2] preparation and extraction of the sediment fraction of interest using physical (sieving, filtering, washing, etc.) or chemical processes (oxidation, digestion, etc.), [3] quantification and characterization of the pyrogenic fraction (manual counting, automatic counting, weight measurements, spectrometry, chromatography, NMR spectroscopy, thermogravimetry, differential scanning calorimetry, scanning electron microscopy, etc.), [4] analysis and processing of the data Conedera et al. 2009 QSR

Vegetation History

Raw Data

Charcoal“Peak” Data dfsfgsdfg

Fire Frequency

Discussion Lake likely dry prior to 4,000 cal yr BP; Lake reformed during period of increasing moisture in Rockies and Great Basin. Long term fire frequency seems to interact with vegetation composition, particularly pine abundance. Results show variation in fire frequency, with modern fire return interval of ~ 83 yrs.

What's Next? Potential for Dendrology study in nearby limber pine forest. Target detailed pollen sampling to randomly selected fires, hoping to find evidence of specific fires on vegetation composition.

Research Questions 1. What is the historic range of variability of fire in the Pine Forest Range? 2. How have changes in vegetation interacted with fire regimes?

Conclusions Historic range of variability (last 4,000 years) has been 2.5-6 fires/ 500 yrs. Average fire return interval over entire record: -125 yrs ± 25 yrs Long term changes in vegetation show: Relatively stable vegetation composition over past 4,000 yrs. Vegetation appears to respond to long term changes in fire frequency. More detailed sampling approach needed to address specific impacts of fire episodes.

Acknowledgements Dr. Tom Minckley Dr. Bryan Shuman-Furnace and Geotech Wyoming Nasa Space Grant Consortium