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Feb 25 Soung-Ryoul Ryu, Asko Noormets, and Jiquan Chen

Comparisons of Modeled ( PnET-Day ) and Measured Carbon Flux of mature Forests in Northern Wisconsin. Feb 25 Soung-Ryoul Ryu, Asko Noormets, and Jiquan Chen. Study Objectives. To evaluate the applicability of PnET-Day for different forest ecosystems

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Feb 25 Soung-Ryoul Ryu, Asko Noormets, and Jiquan Chen

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  1. Comparisons of Modeled (PnET-Day) and Measured Carbon Flux of mature Forests in Northern Wisconsin Feb 25 Soung-Ryoul Ryu, Asko Noormets, and Jiquan Chen

  2. Study Objectives • To evaluate the applicability of PnET-Day for different forest ecosystems • To evaluate the capability of PnET-Day to predict yearly variation • To determine the sources of variation between measured and modeled values

  3. Foliar N concentration PnET-Day Amax Maximum Gross Photosynthesis Basal Respiration Day Temperature Foliage Biomass Night Temperature PAR Radiation VPD Hours Realized Gross Photosynthesis Realized Respiration

  4. Model Parameters Note: * means the values are not constant

  5. Parameters used for the Study

  6. Parameters Preparation South North • Foliar N, SLW, and SLWdel • 8 major species • 5 reps for mature (20~25m tall, 40~60 year old) dominant trees, 3 reps for young (1.5~3.5m tall, 10 years old) dominant trees • DBH is measured • Foliage biomass was measured using field survey (500m2, 5 for each ecosystem) and published allometric equations Top Middle Bottom

  7. Parameters Preparation • k • Beer’s law • Io = Ii * exp(-k*LAI) • LAI was measured using biometric method • Light intensity was measured during daytime (12:00~3:00pm) in- and out-side of the canopy • Phenological parameters were estimated using empirical data

  8. OptTemp = 24 OptTemp = 22 OptTemp = 20 OptTemp = 18

  9. MinTemp = 2 MinTemp = 3 MinTemp = 4

  10. Half Saturation = 150 Half Saturation = 200 Half Saturation = 250

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