1. Aspen Phenology— Results of Field Observation Lab Meeting June 10 th, 2009

2. Outline General introduction General introduction Measurement Measurement Aspen Phenology Aspen Phenology Observation Results Observation Results

3. Aspen (aspen poplar) Populus tremuloides Soft-wooded, quick-growing tree propagating primarily through root sprouts leaving only the top with leafy branches black pots on the northward side and white power on the southward side

4. Spatial Distribution in Western Canada

5. Provenance Trail in Athabasca

6. 1 2 3 4 5 6

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

8. Phenology: flowering 772, foothill of rock mountain

9. Phenology: diseases & position

10. Phenology: Genotype

11. Spatial Variance of Phenotype

12. Phenology: weather Temperature-driver chili day, warm weather Water-driver precipitation, soil moisture Frost damage bud burst(spring), bud set(fall) 789, MN May 18 th Snow Min temperature: -10 °C

13. Temperature and budburst

14. Delta of Temperature and development of bud burst 785, SK 793, BC 785 793

15. Heat sum The accumulation of temperature above a threshold 5 °C Temperature Threshold: 5 °C 5 °C 3 From the first day average temperature above 5 °C to the day bud developed to stage 3 n°C 5°C Σ(Temperature )

17. Heat sum SEEDLOTLATLONGELEVREGIONHeatsumdayHeatsum 75155.03-118.73649ABf142190.2914 75256.41-117.76739nAB143202.8289 75357.12-117.74606nAB143202.8289 75456.61-117.98709nAB145227.2956 75557.78-117.96459nAB141178.2664 75658.56-115.64343nAB136170.6206 75755.19-114.61726cAB148262.2081 75855.34-115.01646cAB151294.0289 75958.2-123.331177BC130155.7539 76058.6-122.33335BC129145.1248 76155.6-116.67632cAB145227.2956 76255.6-116.67632cAB145227.2956 76355.6-116.67632cAB145227.2956 76455.64-114.69709cAB152304.7373 76554.18-115.78731ABf143202.8289 76654.1-116.51018ABf146237.6831 76754.14-116.58868ABf144215.0123 76854.21-116.44803ABf148262.2081 76954.21-116.44803ABf137170.6206 77054.21-116.59914ABf145227.2956 77153.2-115.6939ABf144215.0123 77253.31-115.46939ABf149275.6748 77353.3-115.43927ABf142190.2914 77453.08-115.26912ABf143202.8289 77555.6-113.41762cAB148262.2081 77654.93-112.74545cAB146237.6831 77754.94-112.86546cAB142190.2914 77855.14-113.02601cAB147248.2789 77955.06-112.11624cAB146237.6831 78054.2-105.7490SK149275.6748 78154.2-106.8513SK144215.0123 78254-106.9519SK149275.6748 78353.9-105.8517SK143202.8289 78453.8-106.7583SK149275.6748 78554.03-108530SK146237.6831 78653.8-108.5710SK147248.2789 78753.9-107.5570SK150284.6998 78847-93384MN141178.2664 78947.2-93.8405MN143202.8289 79047.6-93.4424MN140170.6206 79147.5-93.6433MN143202.8289 79247.2-93.4395MN137170.6206 79358.4-123511BC130155.7539 Climate data were downloaded from Environment Canada; Calculated from April 6 (95 th 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: 57 Mean bursting day: 48.62

18. 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... ?

19. Acknowledgement Thanks Andreas Hamann, Barb Thomas, David Kamelchuk, Elisabeth Beaubien, Evan Miller-Tait, Stefan Schreiber, Xianli Wang and others