Dynamics of coast redwood sprout clump development in variable light environments |
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Authors: | Kevin L O’Hara John-Pascal Berrill |
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Institution: | (1) Department of Environmental Science, Policy and Management, University of California, 137 Mulford Hall, Berkeley, CA 94720-3114, USA;(2) Department of Forestry and Wildland Resources, Humboldt State University, One Harpst Street, Arcata, CA 95521, USA |
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Abstract: | Post-thinning stump sprout response was assessed in a coast redwood Sequoia sempervirens (D. Don) Endl.] stand from 5 to 9 years after five treatments were initiated. Nine years after treatment, leaf area index
(LAI) ranged from 5.9 to 14.1 and the percent above canopy light (PACL) ranged from 0.8 to 3.9. Sprout responses included
rapid self-thinning in all treatments with complete sprout mortality at low light regimes. Self-thinning of clumps increased
with greater overstory LAI and poorer light regimes. Leaf area of individual sprout clumps also declined in low light regimes.
The probability of sprout survival declined rapidly below 10 PACL and coincided with declining leaf area in sprout clumps.
A conceptual model is presented that shows the sensitivity of redwood sprouts to light regime. Results have implications for
management of multiaged stands and indicate these redwood coppice systems require relatively severe overstory treatments to
provide sufficient light for sprout vigor and growth. |
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