image of tree rings

Geography 423/523: Advanced Biogeography
Topic for Spring 2009: Dendrochronology

Dendrochronology (tree-ring analysis) is the study of historical patterns of tree growth for the purposes of dating events, reconstructing past climate, and various other objectives.

Meeting times: Tuesday and Thursdays 12:00-1:20 in 307 Deady.
One required field trip.  FRIDAY APRIL 3rd. This will likely occur in two sessions, so everyone can attend and group size is small (5-6 people). 8:30 to 12:00 or 1:30 to 5:00.

Instructor: Daniel Gavin (dgavin@uoregon.edu)
Office: 110 Condon Hall; Phone: 346-5787
Office Hours: 10-12 Fridays in Pacific 217



Required Texts:

An Introduction to Tree-Ring Dating by Stokes and Smiley is a short book covering the basics.

No single book covers the material that I wish to present in this course.  Most readings will be scanned and placed on Blackboard. One text that will be heavily used is the classic Tree Rings and Climate by H.C. Fritts.

Trees occurring in seasonal climates are one of the few groups of organisms that preserve an annual growth record within their tissues.  The records contained in tree rings are an invaluable source of information of past events: climatic events (including patterns in rainfall, temperature, glacier movement, and river discharge), disturbances to forests, and ages of buildings, archeological sites, and furniture.  Acquiring and using tree-ring data requires special knowledge and tools.

Topics covered will include the basics of wood anatomy and the structure of trees, methods (field, laboratory, and statistical), and overview of some of the most interesting findings of tree-ring research.

A major portion of the course will be an individual research project, requiring significant out-of-class time.  You will gain experience with tree-ring analysis, but more importantly, you will design and execute all parts of a research project.  See below for details.

Prerequisites: Geog 323, or permission of the instructor.  For permission, contact me by email and list relevant course experience including courses in geography, math and biological sciences.  Previous experience summarizing data and preparing data graphics will be an asset.

Further information on the field of dendrochronology is available on the Ultimate Tree-Ring Web Pages.

Grading will be based on:
  • Two exams (20%, 20%)
  • An individual research project, involving all the major steps of conducting a research project (50%):
    • Devising a research question
    • Developing sampling methods
    • Conducting field sampling and laboratory analyses
    • Analyzing results using the proper data graphics and statistics
    • Writing a research paper (Introduction, Methods, Results, Discussion)
    • Students enrolled in Geog 523 will be required to analyze their results using sophisticated statistical methods and write a report using the primary scientific literature.  Students in Geog 423 will also be required to conduct statistical analyses and write a scientific report, but expectations for using the primary literature and the level of statistical analysis will be lower.
    • Grade broken down as follows: 
      • Assessment of consistent progress through course (meets three due dates for project development: 15%)
      • Quality of data collection and analysis (25%)
      • Clarity of writing and presentation of research question (30%)
      • Background research: presenting the context for your question and the connection of your results with other studies (30 %)
  • A 10-minute in-class presentation of your research findings & class participation. (10%)
Each student will be responsible for organizing field work and collecting data for their projects.  I encourage you to work in groups for this part of the project, so that you are in the field collecting data together.  Cores collected for one project may be used for another project if the sampling designs permit such sharing. However, everyone will be working on their own project with unique research questions.  

  • These steps must be completed through the term to make adequate progress on your project.  Turn in hard-copy versions of each of these:
    1. Initial project idea, due April 16th.  This should be a note that contains a question that you wish to address in your project (i.e., phrase it as a question).  A few rules:  First, a good question is succinct and addresses a process, not just a simple fact. Bad question: When was the last wild-land fire at Mount Buford?  Good question: Did the decline of fire at Mount Buford coincide with increasing Euro-American settlement or with earlier decline of Native American populations?  Second, a good question is not so broad it is unanswerable.  The previous question is answerable, but likely too difficult for a 10-week period as good data for that particular question are elusive.  Easily obtainable data are 1) the ages of a common forest tree, and/or 2) growth rates of those trees.  Many good, workable, questions involve forest dynamics, including canopy gap dynamics.  I won't list any here to leave the full spectrum of possible topics untouched!  Also, include a few sentences on where sampling will occur and sample size.  I will provide feedback within a few days.
    2. Final project idea, due Apr 28th.  Same as above.  However, also include a few sentences on how the data will be analyzed.  I will again provide feedback.  You should obtain permission from landowners or managers for coring and obtain cores as soon as possible.
    3. Project data summaries, due May 21st.  A list of 1) trees and core samples taken, and 2) cross-dating results (COFECHA output).  Any other ancillary information would be appreciated.
You will also be responsible for obtaining access and permission for working on the lands you wish to sample. Prof. Gavin will have some suggestions on where to begin.

During lecture please be respectful of everyone's learning experience.  This includes:
  1. No talking amongst each other.  Please leave your social conversations for outside the classroom.  However, questions during lectures are encouraged.  If you have a question, raise your hand or catch me after class.
  2. Please don't leave in the middle of lecture. It is distracting for many people, including me. If you need to leave, then let me know before the lecture starts, then sit near an exit.
  3. Do not have your laptop open to surf the web.  Note-taking on laptops is OK.
  4. Cheating.  Cheating, such as copying material from other students on tests, will result in failing the test at a minimum and I will pass the information on to the Dean of Students.  In serious cases, you will flunk the class or be expelled from the university.
  5. Plagiarizing.  Plagiarizing occurs when you copy materials from other sources without citing the source (i.e., taking credit for someone else’s work), or copy someone else’s lab.  All students should be familiar with the material in this guide on avoiding plagiarism.
All readings are mandatory.  Many lectures will have a lab component to be done in 217 Pacific.  These are listed in parentheses.
Week Date Topic Readings (on Blackboard).
1 Mar 31
Overview of the course.  What are tree-rings? Stokes 1-8
Apr 2
A survey of applications of tree-ring analysis.
Fritts 1-54
Apr 3 (Friday) Coring field trip, Buford Park.  Choose one of two sessions: 8:30 to 12:00 or 1:30 to 5:00. Stokes 21-36
Phipps
2 Apr 7
A brief history of the use of tree-ring analysis  (Core mounting)
Stokes 36-46
Apr 9
Tree-ring anatomy – softwoods & hardwoods (Surface prep and ring counting) Stokes 9-20
Hoadley 1-16; 20-22; 28-34
3 Apr 14
Site selection
Pattern recognition and crossdating (Crossdating practice)
Graph paper for skeleton plots
Schweingruber
Stokes 47-57
Yamaguchi
Apr 16
Tree growth dynamics I (Crossdating practice)
Due: initial project idea
Kozlowski 1-30 
4 Apr 21 Tree growth dynamics II (measurement using a slide micrometer) Fritts 163-193
Apr 23 Tree growth dynamics III
Crossdating: statistics (in class: using COFECHA)
COFECHA manual
also this link
Apr 25 Optional field work day to old growth ponderosa pine, Sisters, OR. All day.
5 Apr 28
Standardization (in class: using ARSTAN)
Due: final project idea
Cook 97-108
Apr 30
Exam I
6 May 5
Climate reconstruction I
May 7
Climate reconstruction II Hughes
7 May 12 Dendroclimatology applications: drought and streamflow Cook
Woodhouse
May 14
Dendroecology – forest dynamics Poage and Tappeiner
8 May 19
Dendroecology – insect outbreaks / tree-line dynamics Swetnam: GTR report
Lloyd and Fastie
May 21
Dendroecology – air pollution, forest declines
Due: project data summaries
Gavin
9 May 26
Dendroecology – fire history
Dendrogeomorphology – glacier fluctuations, fluvial processes
Swetnam: PAGES newsletter
Wiles
May 28
Exam 2
10 Jun 2
Project presentations
Jun 4
Project presentations
Jun 8 Project reports due


Department of Geography, University of Oregon
Modified Apr 13, 2009
Document made with Nvu