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Diameter Decreases as a Function of Height?

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From: John Korienek City: Duluth, MN
Hello - I wanted to know (as a rule of thumb) how the diameter of a black walnut decreases with height. For example, a 32" (DBH) diameter black walnut typically decreases in diameter by X inches every Y feet in height. I have seen this on here before, however I could not find it. Can you please fill in X and Y so I get a feel for diameter decrease as you move up a black walnut tree. Thanks, John
	Extension Message From: Jay Hayek Extension Specialist, Forestry Department of Natural Resources and Environmental Sciences jhayek@illinois.edu
Sorry John, but I'm confident that I've never responded to such a "rule of thumb" inquiry regarding walnut diameter growth decline as a function of tree height. However, the link listed below is to a USDA Forest Service publication on the "DIAMETER GROWTH, SURVIVAL, AND VOLUME ESTIMATES FOR TREES IN INDIANA AND ILLINOIS." It includes estimates for black walnut. http://www.nrs.fs.fed.us/pubs/rp/rp_nc257.pdf Best of luck!
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