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Leaf litterfall, leaf area index, and radiation transmittance in cypress wetlands and slash pine plantations in north-central Florida

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Abstract

The seasonal dynamics of leaf litterfall and leaf area index (LAI, all-sided basis), light penetration and the vertical distribution of surface area index, and the feasibility of estimating LAI from radiation transmittance were studied from April 1993 to March 1994 in the canopies of three cypress (Taxodium ascendens) wetlands and their surrounding slash pine (Pinus elliottii) uplands in Florida flatwoods. Annual leaf litterfall ranged from 324 to 359 g m−2 in the wetlands, which was very close to the average for 11 sites throughout Florida of 340±26 g m−2. The seasonal pattern of the normalized LAI obtained for the dominant tree species in the ecosystems could be used to construct the seasonal dynamics of LAI at the ecosystem scale. The vertical distribution of surface area index in the wetlands was significantly different from that in the surrounding pine uplands. The maximum LAI of cypress wetlands in this area was about 8 m2 m−2, which was higher than the maximum of slash pine plantations of 6 m2 m−2. Cypress leaves were strongly erectophile in space. Results showed that the LAI-2000 canopy analyzer could generally be used to estimate forest LAI, whether the forest canopy was closed or not, if an overall clum** index of 2.00 was applied. However, as LAI decreased, the relative error contained in the radiation-based LAI estimates increased. This indicated that foliage clum** at the stand scale was more important than that at the tree or branch scale.

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Author notes

  1. S. Liu

    Present address: Department of Botany, University of Wyoming, 82071-3165, Laramie, WY, USA

Authors and Affiliations

  1. School of Forest Resources and Conservation, University of Florida, 32611, Gainesville, FL, USA

    S. Liu, H. Riekerk & H. L. Gholz

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  1. S. Liu
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  2. H. Riekerk
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  3. H. L. Gholz
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Correspondence to S. Liu.

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Liu, S., Riekerk, H. & Gholz, H.L. Leaf litterfall, leaf area index, and radiation transmittance in cypress wetlands and slash pine plantations in north-central Florida. Wetlands Ecol Manage 4, 257–271 (1996). https://doi.org/10.1007/BF02150539

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