Introduction to Dendrochronology and San Juan Fire Histories.

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Presentation transcript:

Introduction to Dendrochronology and San Juan Fire Histories

Dendrochronology Dendron = Tree Chronos = Time Logos = Study of Dendron = Tree Chronos = Time Logos = Study of

Building a master chronology

Principles of Dendrochronology Uniformity Limiting Factors Sensitivity Ecological Amplitude Site Selection Crossdating Uniformity Limiting Factors Sensitivity Ecological Amplitude Site Selection Crossdating

Principle of Uniformity “The present is the key to the past.” ~James Hutton, 1785 ~James Hutton, 1785 “The past is the key to the future.” ~Dendro quote ~Dendro quote “The present is the key to the past.” ~James Hutton, 1785 ~James Hutton, 1785 “The past is the key to the future.” ~Dendro quote ~Dendro quote James Hutton

Principle of Limiting Factors

Principle of Ecological Amplitude

Principle of Site Selection

Principle of Crossdating

San Juan Fire Histories

Recorder Trees

Jackson Mtn JAK5 JAK3 JAK1 JAK2 JAK1 JAK2 JAK4

Archuleta Mesa

F IRE H ISTORY P LOT

A Brief History…. Aristotle 350 BC Aristotle 350 BC da Vinci 1500 da Vinci 1500 Duhamel & Buffan 1737 Duhamel & Buffan 1737 Alexander Twining 1827 Alexander Twining 1827 Charles Babbage 1838 Charles Babbage 1838 Theodor Hartig 1855 Theodor Hartig 1855 Jacob Keuchler 1859 Jacob Keuchler 1859

Principle of Aggregate Tree Growth R t = Ring Growth G t = Age related growth curve C t = Climate related growth variation & trend D 1t = Endogenous disturbance pulse D 2t = Exogenous disturbance pulse E t = Random variation R t = Ring Growth G t = Age related growth curve C t = Climate related growth variation & trend D 1t = Endogenous disturbance pulse D 2t = Exogenous disturbance pulse E t = Random variation

Principle of Replication

Fire scar formation

Piedra Area

Sheep Creek

Fire History Locations

All Fires SitePeriodMFIRange Archuleta Mesa Dry Ponderosa Pine 1650 – – 24 Turkey Springs Ponderosa Pine 1700 – – 18 Bear Park Warm-Dry Mixed Conifer 1685 – – 31 Jackson Mtn Cool-Moist Mixed Conifer 1685 – – 25 Corral Mtn Cold-Wet Mixed Conifer 1685 – – 45

25% Scarred SitePeriodMFIRange Archuleta Mesa Dry Ponderosa Pine 1650 – – 40 Turkey Springs Ponderosa Pine 1700 – – 33 Bear Park Warm-Dry Mixed Conifer 1685 – – 71 Jackson Mtn Cool-Moist Mixed Conifer 1685 – – 65 Corral Mtn Cold-Wet Mixed Conifer 1685 – – 65