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Research Note
Title: Lignin staining ...a limited success in identifying koa growth rings
Author: Wick, Herbert L.
Date: 1970
Source: Res. Note PSW-RN-205. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 4 p
Station ID: RN-PSW-205
Description: Among the lignin stains tested in trying to identify growth rings in koa (Acacia koa Gray), phloroglucinol was the most effective. The light colored sapwood of mature trees stained readily, with growth rings apparent. But staining failed to emphasize rings in the dark colored heartwood. Growth rings were not apparent on samples from young fast growing, sapling size trees. In none of the samples could growth rings be used to estimate tree age or periodic growth.
Keywords: Acacia koa, age determination, ring count, lignin stainin,phlornglucinol
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Citation
Wick, Herbert L. 1970. Lignin staining ...a limited success in identifying koa growth rings. Res. Note PSW-RN-205. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 4 p.