Web-Based Tools for Teaching Dendrochronology

This article describes two web-based tools for teaching dendrochronology, the scientific study of tree rings, and presents quantitative evaluations of their value in a large class. Because of its wide scientific applicability, dendrochronology is appropriate for teaching in a wide array of courses, including those in the fields of natural resources and life sciences. Until recently, professors have not had quick and efficient ways to teach basic tenets of tree-ring analysis, including crossdating. One strategy is to apply technological tools, especially the World Wide Web, to teaching topics such as dendrochronology generally and crossdating specifically. To fill this need, I developed a Java-language applet simulation for teaching crossdating by skeleton plotting. I also compiled a web-based module on forest fire management in the Southwest, a real and current environmental issue that incorporates dendrochronology. To evaluate the effectiveness of these web-based teaching tools, they were used in a large course and the students were then surveyed and tested with multiplechoice and true-false questions covering the topics of crossdating and forest firemanagement. The crossdating applet package resulted in substantial comprehension of what was a new concept for most of the students. The southwestern forest fire management module also resulted in significant improvement in understanding of that complex environmental issue. I welcome other educators to use these web-based tools, currently available here: http://www.ltrr.arizona.edu/skeletonplot/introcrossdate.htm (verified 10Oct. 2002) and http://www.ltrr.arizona.edu/ ~sheppard/swland/swfire.html (verified 10 Oct. 2002).