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Leaf Area Index and Above-Ground Biomass of terra firme Rain Forest and Adjacent Clearings in Amazonia

A.-L. C. McWilliam, J. M. Roberts, O. M. R. Cabral, M. V. B. R. Leitao, A. C. L. de Costa, G. T. Maitelli and C. A. G. P. Zamparoni
Functional Ecology
Vol. 7, No. 3 (Jun., 1993), pp. 310-317
DOI: 10.2307/2390210
Stable URL: http://www.jstor.org/stable/2390210
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Leaf Area Index and Above-Ground Biomass of terra firme Rain Forest and Adjacent Clearings in Amazonia
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Abstract

1. Leaf area index (L*) and above-ground biomass were determined by destructive sampling for a 400-m2 area of terra firme amazonian rain forest and for an adjacent clearing. 2. While L* in the forest varied considerably with height through the canopy for four separately sampled 100-m2 subplots, the cumulative L* was similar with a mean value of 5.7\pm 0.5. 3. The total above-ground dry biomass of the forest was 265\pm 95 t ha-1, while the leaf dry biomass was 6.3\pm 0.5 t ha-1. 4. The specific leaf area (SLA, cm2 g-1) was determined, and found to vary linearly with canopy depth rising from 65 cm2 g-1 at the canopy top, to 114 cm2 g-1 at 5 m above the forest floor. The average for the four subplots was 90 cm2 g-1. 5. The leaf area index of grass in the clearing (blade only) averaged 0.8\pm 0.4, and total green area index (blade+stem) averaged 1.2\pm 0.6. Total above-ground dry biomass (blade, stem) was 2.3\pm 0.6 t ha-1, while including dead plant material gave a total dry biomass of 5.6\pm 2.1 t ha-1. Specific leaf area of the grass was 79 cm2 g-1. 6. The results clearly demonstrate the profound change in leaf area and biomass which accompany amazonian deforestation.

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