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    Author(s): Herbert L. Wick
    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
    Publication Series: Research Note (RN)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (538 KB)

    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.

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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

    Keywords

    Acacia koa, age determination, ring count, lignin stainin, phlornglucinol

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