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Phenology

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Phenology. Why is it important to take these measurements? ... With phenology data, you can study... Budburst. Ideal Site Criteria. Native deciduous trees ... – PowerPoint PPT presentation

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Title: Phenology


1
Phenology Budburst, Green-up and Green-down
2
Objectives
  • 1) Learn the definition of phenology.
  • 2) Understand why it is important to study
    phenology
  • 3) Overview when and how to take measurements
    with the Budburst Protocol
  • 4) Overview when and how to take measurements
    with the Green-Up/Green-Down Protocols

3
What is Phenology?
  • Phenology is the study of living
  • organisms response to seasonal and
  • climatic changes in their environment.
  • Seasonal changes include variations in day
    length or duration of sunlight, precipitation, or
    temperature.

4
Plant growing season generally the period
between green-up and green-down.
  • Length of growing season can be dictated by
    changes in temperature, precipitation, length of
    day, etc

5
Phenology
  • Why is it important to take these measurements?

6
With phenology data, you can study
  • Changes in length of growing season over time
    (indicator of climate change)
  • Agriculture
  • Wild fire danger
  • Animal migrations

7
Budburst Ideal Site Criteria
  • Native deciduous trees
  • Choose dominant overstory species
  • Can choose multiple species to do comparative
    studies
  • Easily accessible

8
Budburst observations
  • Twice weekly, starting at least two weeks before
    initial budburst observe selected tree(s) until
    budburst can be seen on three locations on a tree

9
Green-Up and Green-Down Ideal Site Selection
Criteria
  • Native deciduous trees, shrubs or grasses
  • Choose dominant overstory species Always think
    What does the satellite see from above?
  • If over-story plants are evergreen conifers, use
    under-story broadleaf trees or shrubs

10
Green-Up and Green-Down Ideal Site Selection
Criteria
  • Avoid sites near buildings or where watering or
    fertilization is done
  • Easily accessible
  • Try to use the same plants for green-up and
    green-down

11
Green-Up and Green-Down Ideal Site Selection
Criteria
  • Choose a location close to the Atmosphere and
    Soil Moisture Study Sites
  • Keep the horizontal distance less than 2
    kilometers
  • Keep the elevation difference less than 100
    meters
  • Site can be a tree or grasses

12
When to take Green-up observations
  • Twice weekly, starting at least two weeks before
    initial budburst until leaf length stops
    increasing.

13
Green-up and Green-down Trees/Shrubs Branch and
Leaf Selection
  • Choose branch
  • facing equator
  • Exposed to sunlight (not shaded)
  • Determine Genus, species
  • Mark branch for identification
  • Locate bud at end of branch and 3 closest
  • Photos N, S, E, W

14
Green-up Trees/Shrubs
  • Examine bud
  • Determine category Dormant, Swelling, Budburst,
    Lost
  • Measure leaf length (mm) not including petiole
  • Continue until leaf stops increasing in length

15
Green-up Grasses
  • Identify and mark 1 m2 area to study
  • Exposed to sunlight (not shaded)
  • Determine Genus
  • Look for new shoots, mark for identification
  • Measure shoot length (mm)
  • Until shoot stops increasing in length

16
Green-up Grasses
  • Marking of buds and shoots
  • Trees/bushes
  • Grasses

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17
When to take Green-down observations
  • Twice weekly, starting two weeks before initial
    green-down until leaf color change is complete or
    leaves fall off

18
Green-down Trees/Shrubs
  • Examine twice/week
  • Use color guide to choose dominant color (if
    multiple colors) until color change stops
  • Other possible observations -
  • Snow covered
  • Fallen (lost)

19
Green-down Trees/Shrubs
  • Locate and Mark 4 longest shoots within mark 1 m2
    area
  • Examine twice/week
  • Use color guide to choose dominant color (if
    multiple colors) until color change stops
  • Other possible observations -
  • Snow covered
  • Fallen (lost)
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