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    Author(s): O. Gordon Langdon; Dean S. DeBell; Donal D. Hook
    Date: 1978
    Source: Fifth North American Forest Biology Workshop Proceedings
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    PDF: Download Publication  (943.0 KB)


    Patterns of diameter growth and the relation of diameter growth to water table levels were determined for 90-yearold swamp tupelo (Nyssa sylvatica var. biflora (Walt.) Sarg.) trees growing in an undisturbed habitat. Initiation and cessation of diameter growth varied from year to year and tree to tree. Initiation occurred over a ~~-month period (late March through May) and cessation over a 3½-month period (mid-July through October). Growth peaked in late May, declining only slightly in June through mid-July. Although growth occurred over a 32-week period, the average length of the growing season was 21 weeks, and within this 21weeks there were nearly 6 weeks on an average in which no measurable growth occurred. Diameter growth during the May 2- July 25 period when 75 percent of growth occurred was related positively (r2=0.431) to average water table level for the period. An analysis of the monthly relationships between water table and growth during this period revealed that higher water tables in April, June, and July and lower ones in May were related (R 2=0.916) to improved periodic growth.

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    Langdon, O. Gordon; DeBell, Dean S.; Hook, Donal D. 1978. Diameter growth of swamp tupelo: seasonal pattern and relation to water table level. In: Fifth North American Forest Biology Workshop Proceedings; 1978 March; Gainesville, FL: 326-333.


    Nyssa sylvatica var. biflora, swamp drainage, growth initiation, intermittent growth, growth cessation

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