Introduction to Dendrochronology and San Juan Fire Histories.
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Transcript of Introduction to Dendrochronology and San Juan Fire Histories.
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Introduction to
Dendrochronologyand
San Juan Fire Histories
Introduction to
Dendrochronologyand
San Juan Fire Histories
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DendrochronologyDendrochronology
Dendron = Tree
Chronos = Time
Logos = Study of
Dendron = Tree
Chronos = Time
Logos = Study of
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Building a master chronology
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Principles of
Dendrochronology
Principles of
Dendrochronology•Uniformity
•Limiting Factors
•Sensitivity•Ecological Amplitude
•Site Selection
•Crossdating
•Uniformity
•Limiting Factors
•Sensitivity•Ecological Amplitude
•Site Selection
•Crossdating
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Principle of UniformityPrinciple of UniformityPrinciple of UniformityPrinciple of Uniformity
““The present is the key to the past.”The present is the key to the past.”
~James Hutton, 1785~James Hutton, 1785
““The past is the key to the future.”The past is the key to the future.”
~Dendro quote ~Dendro quote
““The present is the key to the past.”The present is the key to the past.”
~James Hutton, 1785~James Hutton, 1785
““The past is the key to the future.”The past is the key to the future.”
~Dendro quote ~Dendro quote
1726-17971726-1797James HuttonJames Hutton1726-17971726-1797James HuttonJames Hutton
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Principle of Limiting Factors
Principle of Limiting Factors
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Principle of Ecological Amplitude
Principle of Ecological Amplitude
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Principle of Site SelectionPrinciple of Site Selection
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Principle of CrossdatingPrinciple of Crossdating
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Principle of Crossdating
18991899
19021902
19041904
18961896
18931893 18941894
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San Juan Fire HistoriesSan Juan Fire Histories
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Recorder Recorder TreesTreesRecorder Recorder TreesTrees
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Jackson MtnJackson Mtn
JAK5JAK5
JAK3JAK3
JAK1JAK2JAK1JAK2
JAK4JAK4
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Archuleta MesaArchuleta Mesa
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L A R G E F I R E S
M E D I U M F I R E S
FFIREIRE H HISTORYISTORY P PLOTLOT
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A Brief History….A Brief History….
Aristotle350 BC
Aristotle350 BC
da Vinci1500
da Vinci1500
Duhamel & Buffan1737
Duhamel & Buffan1737
Alexander Twining1827
Alexander Twining1827
Charles Babbage1838
Charles Babbage1838
Theodor Hartig1855
Theodor Hartig1855
Jacob Keuchler1859
Jacob Keuchler1859
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Principle of Aggregate Tree Growth
Principle of Aggregate Tree Growth
Rt = Ring GrowthGt = Age related growth curveCt = Climate related growth variation & trendD1t = Endogenous disturbance pulseD2t = Exogenous disturbance pulseEt = Random variation
Rt = Ring GrowthGt = Age related growth curveCt = Climate related growth variation & trendD1t = Endogenous disturbance pulseD2t = Exogenous disturbance pulseEt = Random variation
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Principle of ReplicationPrinciple of Replication
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Fire scar formationFire scar formation
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Piedra AreaPiedra Area
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Sheep CreekSheep Creek
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Fire History LocationsFire History Locations
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AllFires
Site Period MFI Range
Archuleta MesaDry Ponderosa Pine
1650 – 1900 10 2 – 24
Turkey SpringsPonderosa Pine
1700 – 1880 6 1 – 18
Bear ParkWarm-Dry Mixed Conifer
1685 – 1880 8 1 – 31
Jackson MtnCool-Moist Mixed Conifer
1685 – 1873 10 2 – 25
Corral MtnCold-Wet Mixed Conifer
1685 – 1851 18 3 – 45
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25%Scarre
d
Site Period MFI Range
Archuleta MesaDry Ponderosa Pine
1650 – 1900 17 7 – 40
Turkey SpringsPonderosa Pine
1700 – 1880 18 10 – 33
Bear ParkWarm-Dry Mixed
Conifer1685 – 1880 22 9 – 71
Jackson MtnCool-Moist Mixed Conifer
1685 – 1873 21 10 – 65
Corral MtnCold-Wet Mixed Conifer
1685 – 1851 42 24 – 65
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