1 / 30

Tree Rings

Tree Rings. Bilingual section IES Pedro de Valdivia. Starter. Can you, in groups of 4, find the value of Pi? You have 4 pieces of string (20, 30, 40 and 50 cm in length), a piece of graph paper and a ruler. Go!!!. Dendrochronology? It’s all greek to me!. Dendrochronology. Pronounced

armani
Download Presentation

Tree Rings

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Tree Rings Bilingual section IES Pedro de Valdivia

  2. Starter • Can you, in groups of 4, find the value of Pi? • You have 4 pieces of string (20, 30, 40 and 50 cm in length), a piece of graph paper and a ruler. Go!!!

  3. Dendrochronology? It’s all greek to me!

  4. Dendrochronology • Pronounced • den – dro - kron – o - la – gee • Word roots • dendro (from dendros, greek for tree) • chrono (from chronos, greek for time or past events) • logy (from logos, greek for reason or word. “ology” indicates a study or theory)

  5. What are tree rings? • Growth – varies throughout year in our climate • Late Spring/Summer – wide light coloured ring (lots of growth) • Late summer/autumn – narrow darker ring (little growth) • Winter – dormant (no growth)

  6. X From LTTR, Arizona • So one year’s growth is a dark and light ring together = annual growth ring = X

  7. From LTTR, Arizona • Earlywood – appears light in colour – cells are thin walled and large in diameter • Latewood – appears dark in colour – cells have thick walls and are small in diameter • Total ring width = a light and dark band

  8. Photos by Grassino-Mayer at UTK (see web address)

  9. An aerial photo of the wooded area before the felling in 2002. X marks the area where the felled trees came from at grid reference 832396 X Courtesy of Multimap

  10. x Courtesy of Multimap

  11. An area of pine trees showing how close together they are as they grow

  12. The area after the trees were felled in autumn 2002

  13. Young pine trees ready to plant in the cleared area in 2004

  14. A pupil, Bielby junior, collecting measurements from felled pines

  15. Task 1. Is there a relationship between the age (number of rings) and the diameter of the tree?

  16. Stop here to do task

  17. Task 2. Marking off actual years and events on a tree section

  18. 2002 The new millenium? ? When were you born? The year England won the world cup?

  19. Put in some important dates

  20. Task 3. Is there a relationship between the shape of the tree section and where it grew?

  21. Look at the shape of this cross section of a tree trunk. What is unusual about the shape? Think about how it has grown Think about where it might have been in the group of trees that were cut down (go back to the photo and map on slides 9 and 10)

  22. Task 4. Is there a relationship between the width of the summer ring and the weather that year? See slide 6

  23. Sites for primary pupils http://www.safetreekids.net/index.html A public education programme of the Pacific Gas and Electric Company. It has a section on tree rings and an activity to draw rings on downloadable cartoon tree sections. Sites for secondary pupils Tree Rings: A Study of Climate Change http://vathena.arc.nasa.gov/curric/land/global/treestel.html A very comprehensive site that has a glossary, very readable text and a series of activities to help pupils understand the relationship between tree ring growth and climate. Current Useful Websites about Tree Rings and Dendrochronology

  24. Sites for teachers Henri D. Grissino-Mayer's Ultimate Tree-Ring Web Pages http://web.utk.edu/~grissino/principles.htm and ............/gallery.htm • Ideal for a teacher who wants to know a little more about the subject. There is an extensive gallery that has some very clear images of tree rings in a variety of species that could be used to help pupils understand the principle of tree aging. Oxford Dendrochronology Laboratory Daniel Miles, Michael Worthington, and Dr Martin Bridge http://www.dendrochronology.com/ • Technical site that would be useful for background information for the teacher. The University of Arizona. The Laboratory of Tree-Ring Research Dendrochronology http://www.ltrr.arizona.edu/dendrochronology.html • A very detailed site with clear explanations about tree rings supported with comprehensive illustrations. Title: Tree Rings - Dendrochronology (2 Lessons) Prepared by: Claudia Marosz, Garden Grove Unified School District, Westminster, CA, USA http://www-sci.lib.uci.edu/SEP/CTS/TreeRing.html • A rather complex site but there is an excellent description of tree rings by Bruce Palmer (very readable for secondary pupils) if you scroll to the bottom of the page. Tree Rings. A cursory look at these well known features by Paul James, UK • Published in the  January 2002 edition of Micscape Magazine the on-line monthly magazine of the Microscopy UK web. http://www.microscopy-uk.org.uk/mag/artjan02/treering.html • An excellent gallery of sections of a variety of trees.

More Related