Aspen Phenology—Results of Field Observation

Lab Meeting June 10th, 2009

Outline

• General introduction • Measurement • Aspen Phenology • Observation Results

Aspen (aspen poplar) Populus tremuloides

Soft-wooded, quick-growing treepropagating primarily through root sproutsleaving only the top with leafy branchesblack pots on the northward side and white power on the southward side

Spatial Distribution in Western Canada

Provenance Trail in Athabasca

120 130 140

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6In

dex

of B

ud-b

reak

Days

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6

What’s affect the timing of phenology• Genotype • Weather• Flowering • Diseases • Position on the tree

Phenology: flowering

772, foothill of rock mountain

2 4 6 8 10

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23

45

Time

Ind

ex

of B

ud

bu

rst

Phenology: diseases & position

Phenology: Genotype

Bud090504 Bud090507 Bud090511 Bud090515 Bud090518 Bud090522 Bud090525 Bud090527 Bud090529 Bud0906020

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751 752753 754755 756757 758759 760761 762763 764765 766767 768769 770771 772773 774775 776777 778779 780781 782783 784785 786787 788789 790791 792793

Spatial Variance of Phenotype

Phenology: weather

• Temperature-driverchili day, warm weather

• Water-driverprecipitation, soil moisture

• Frost damagebud burst(spring),bud set(fall) 789, MN

May 18th SnowMin temperature: -10 °C

Temperature and budburst

4-May

5-May

6-May

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31-May

1-Jun

2-Jun

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16 Temperature

Bud090504 Bud090507 Bud090511 Bud090515 Bud090518 Bud090522 Bud090525 Bud090527 Bud090529 Bud0906020

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P793

P785

Delta of Temperature and development of bud burst

1 2 3 4 5 6 7 8 905

10152025303540

Temperature

1 2 3 4 5 6 7 8 90

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1.4

785, SK 793, BC

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0

0.5

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1.5

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2.5

785

793

Heat sum

• The accumulation of temperature above a threshold

• Temperature Threshold: 5 °C• From the first day average temperature above

5 °C to the day bud developed to stage 3

n°C

5°C

Σ(Temperature )

4-May

5-May

6-May

7-May

8-May

9-May

10-May

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31-May

1-Jun

2-Jun

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16 Temperature

Heat sumSEEDLOT LAT LONG ELEV REGION Heatsumday Heatsum

751 55.03 -118.73 649 ABf 142 190.2914752 56.41 -117.76 739 nAB 143 202.8289753 57.12 -117.74 606 nAB 143 202.8289754 56.61 -117.98 709 nAB 145 227.2956755 57.78 -117.96 459 nAB 141 178.2664756 58.56 -115.64 343 nAB 136 170.6206757 55.19 -114.61 726 cAB 148 262.2081758 55.34 -115.01 646 cAB 151 294.0289759 58.2 -123.33 1177 BC 130 155.7539760 58.6 -122.33 335 BC 129 145.1248761 55.6 -116.67 632 cAB 145 227.2956762 55.6 -116.67 632 cAB 145 227.2956763 55.6 -116.67 632 cAB 145 227.2956764 55.64 -114.69 709 cAB 152 304.7373765 54.18 -115.78 731 ABf 143 202.8289766 54.1 -116.5 1018 ABf 146 237.6831767 54.14 -116.58 868 ABf 144 215.0123768 54.21 -116.44 803 ABf 148 262.2081769 54.21 -116.44 803 ABf 137 170.6206770 54.21 -116.59 914 ABf 145 227.2956771 53.2 -115.6 939 ABf 144 215.0123772 53.31 -115.46 939 ABf 149 275.6748773 53.3 -115.43 927 ABf 142 190.2914774 53.08 -115.26 912 ABf 143 202.8289775 55.6 -113.41 762 cAB 148 262.2081776 54.93 -112.74 545 cAB 146 237.6831777 54.94 -112.86 546 cAB 142 190.2914778 55.14 -113.02 601 cAB 147 248.2789779 55.06 -112.11 624 cAB 146 237.6831780 54.2 -105.7 490 SK 149 275.6748781 54.2 -106.8 513 SK 144 215.0123782 54 -106.9 519 SK 149 275.6748783 53.9 -105.8 517 SK 143 202.8289784 53.8 -106.7 583 SK 149 275.6748785 54.03 -108 530 SK 146 237.6831786 53.8 -108.5 710 SK 147 248.2789787 53.9 -107.5 570 SK 150 284.6998788 47 -93 384 MN 141 178.2664789 47.2 -93.8 405 MN 143 202.8289790 47.6 -93.4 424 MN 140 170.6206791 47.5 -93.6 433 MN 143 202.8289792 47.2 -93.4 395 MN 137 170.6206793 58.4 -123 511 BC 130 155.7539

Climate data were downloaded from Environment Canada;

Calculated from April 6 (95th day).

The mean temperature of this day is 5.395652;

Min heatsum: 145.1248 Max heatsum: 304.7373 Mean heatsum: 220.6493

Min bursting day: 34 Max bursting day: 57Mean bursting day: 48.62

What’s the next

1, calculating the greenup day from RS imagery (2000 to 2005)

2, calculating the heatsum day based on ClimateBC/PP/WNA software packages;

3, comparing the two results;4, your advices... ?

Acknowledgement

ThanksAndreas Hamann, Barb Thomas,

David Kamelchuk, Elisabeth Beaubien, Evan Miller-Tait, Stefan Schreiber, Xianli Wang

and others