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Project ID: 11-3-1-27

Year: 2011

Date Started: 08/01/2011

Date Completed: 11/29/2013

Title: Reconstruction of Fire History Using Tree-Ring and Alluvial Sediment Records in the Western San Juan Mountains, Colorado

Project Proposal Abstract: There has been an increase in severe forest fires across the western US in recent decades, which is associated with multi-year droughts and warming temperatures. In the southwestern US, high-severity fires in ponderosa pine and mixed conifer ecosystems are considered unprecedented by many fire ecologists. This dissertation research of the Co-PI combines alluvial stratigraphy and dendrochronology at the scale of four tributary drainage basins, in order to reconstruct the fire history of ponderosa pine and mixed-conifer forests in the western San Juan Mountains of Colorado. Alluvial sediment deposits will be sampled from multiple exposures in the valley bottoms of tributary basins and their alluvial fans. When sediment deposits contain charcoal, they are used to interpret past fire events in the contributing basin. The sediment characteristics are used to infer the severity of past fire events, and radiocarbon dating yields a chronology of all sedimentation events. Fire-related sedimentation events have been collected and dated for three of four basins, and a fourth basin is needed, in order to create a regional fire history record. Tree-ring data has already been collected from the four tributary basins, and will help define fire severity interpretations associated with the most recent alluvial deposits (< 500 years). Tree-ring methods reconstruct fire events with annual to decadal precision, by dating fire-scarred trees and tree regeneration ages. Furthermore, a charcoal analysis will be applied to the charcoal samples, which will enhance the interpretations of fire severity based on sediment deposits. The results from the two proxy methods will be combined at the scale of four tributary basins, yielding a fire history record covering the past 4,000 years before present. The GRIN award would support the final data collection, data analysis and the publication of three papers as part of the dissertation project of the Co-PI.

Principal Investigator: Thomas W. Swetnam

Agency/Organization: University of Arizona-Tucson

Branch or Dept: Laboratory of Tree-Ring Research


Other Project Collaborators

Type

Name

Agency/Organization

Branch or Dept

Agreements Contact

Lee Anne T. Peters

University of Arizona-Tucson

Office of Research & Contract Analysis

Budget Contact

Sherry L. Esham

University of Arizona-Tucson

Sponsored Projects Services

Co-Principal Investigator

Erica R. Bigio

University of Arizona-Tucson

Laboratory of Tree-Ring Research


Project Locations

Consortium

Southern Rockies


Level

State

Agency

Unit

STATE

CO

FS

San Juan National Forest


Project Deliverables

Final Report view or print

("Results presented in JFSP Final Reports may not have been peer-reviewed and should be interpreted as tentative until published in a peer-reviewed source.")

There are no deliverables available for this project.

Supporting Documents

There are no supporting documents available for this project.

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