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Dendrochronology Presentation by Richard Nesslar


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Tall Trees - Dendrochronology Presentation by Richard Nesslar of the Wisconsin DNR

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Dendrochronology Presentation by Richard Nesslar

  1. 1. Richard Nesslar Forest Ranger- WI DNR Dendrochronology
  2. 2. Presentation Summary: What you should learn 1) Define Dendrochronology 2) How Rings Form 3) How Dendrochronology is Utilized
  3. 3. What is Dendrochronology?
  4. 4. Dendrochronology: Definition  Dendro: Tree  Chrono: Time  Dendrochronology= is the study of data from tree ring growth over time
  5. 5. How Do Tree Rings Form?
  6. 6. Two Types of Tree Growth 1) Primary- Height Growth Stem elongation- Tree grows taller and branches extend.
  7. 7. Two Types of Tree Growth  Secondary Growth- Diameter Growth -Each year trees form new cells arranged in circles, called annual rings -These annual rings show the amount of wood produced in one year
  8. 8. Annual Rings  Spring: (beginning of growing season) large cells are produced that are light in appearance- springwood  Summer/Fall: (end of growing season) cells produced are small, with thick walls that are darker in appearance- latewood  No portion of the ring is formed during the winter (dormant season)
  9. 9. Who Uses Dendrochronology? Foresters (Dendrologists) Climatologists Archeologists
  10. 10. Foresters  Stand Age  Site Index- Measure of site quality  Stand Vigor  Tree Growth/ Yield Estimates
  11. 11. Climatologists  A record dating back thousands of Years (4800yr old bristlecone pine)  Used to determine both short- term and long-term climate trends -Little Ice Age -Medieval Warming Period
  12. 12. Archeologists  Cross-Referencing -approximate age -location  Radiocarbon Dating -amount of radiocarbon-14 isotope in a sample - compared to known reference
  13. 13. Conclusion  Dendrochronology: is the study of data from tree ring growth over time  Rings Formed by: Seasonal cycles and differences in resource availability  Uses: -Forestry -Climatology -Archeology
  14. 14. Helpful Websites  https://www.environmentalscien rings-tell-us  https://www.theforestacademy.c om/tree-knowledge/annual- growth-rings/#.XufdlUxFxPZ  540/tree-rings-provide-snapshots- of-earths-past-climate/  ex.php/dendrochronology  ournals/2017/rmrs_2017_derose_j 001.pdf