Seasonal changes of leaf area index (LAI) in a tropical deciduous forest in west Mexico

Seasonal changes of leaf area index (LAI) in a tropical deciduous forest in west Mexico Light canopy transmittance and the Beer-Lambert equation were utilized to assess monthly leaf area index (LAI) of a tropical deciduous forest ecosystem on the west coast of Mexico. The light transmittance coefficient ( k ) was obtained by analyzing vertical leaf and light distribution in the forest canopy. An independent LAI estimate was obtained using litterfall data. The calculated k value was 0.610 ± 0.035 (standard error). Average maximum LAI obtained with litterfall data was 4.2 ± 0.4 m 2 m −2 . There was a significant correlation ( P < 0.001, r = 0.98) between litter-LAI estimations and those obtained with the Beer-Lambert equation. The regression explained 95% of the variation; however, light-LAI overestimated litter-LAI by a constant of 0.87 ± 0.12 m 2 m −2 (the slope was 1.03 and Y intercept was 0.87). The discrepancy is partially attributed to leaf retention of the few evergreen species, and perhaps leaf retention of a few deciduous species beyond the end of the litterfall collection. Maximum annual LAI was similar in both study years (4.5 ± 0.3 m 2 m −2 in 1990 and 4.9 ± 0.4 in 1991). Minimum LAI showed considerable variation between years with similar values in the dry seasons of 1990 and 1991 (1.0 ± 0.1 m 2 and 0.9 ± 0.1 m 2 m −2 , respectively), but much higher values in 1992 (2.7 ± 0.2 m 2 m −2 ). The difference is probably attributed to an atypical rainfall event in January 1992 (644 mm), which retarded leaf abscission. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Forest Ecology and Management Elsevier

Seasonal changes of leaf area index (LAI) in a tropical deciduous forest in west Mexico

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Ltd
ISSN
0378-1127
eISSN
1872-7042
D.O.I.
10.1016/0378-1127(94)03485-F
Publisher site
See Article on Publisher Site

Abstract

Light canopy transmittance and the Beer-Lambert equation were utilized to assess monthly leaf area index (LAI) of a tropical deciduous forest ecosystem on the west coast of Mexico. The light transmittance coefficient ( k ) was obtained by analyzing vertical leaf and light distribution in the forest canopy. An independent LAI estimate was obtained using litterfall data. The calculated k value was 0.610 ± 0.035 (standard error). Average maximum LAI obtained with litterfall data was 4.2 ± 0.4 m 2 m −2 . There was a significant correlation ( P < 0.001, r = 0.98) between litter-LAI estimations and those obtained with the Beer-Lambert equation. The regression explained 95% of the variation; however, light-LAI overestimated litter-LAI by a constant of 0.87 ± 0.12 m 2 m −2 (the slope was 1.03 and Y intercept was 0.87). The discrepancy is partially attributed to leaf retention of the few evergreen species, and perhaps leaf retention of a few deciduous species beyond the end of the litterfall collection. Maximum annual LAI was similar in both study years (4.5 ± 0.3 m 2 m −2 in 1990 and 4.9 ± 0.4 in 1991). Minimum LAI showed considerable variation between years with similar values in the dry seasons of 1990 and 1991 (1.0 ± 0.1 m 2 and 0.9 ± 0.1 m 2 m −2 , respectively), but much higher values in 1992 (2.7 ± 0.2 m 2 m −2 ). The difference is probably attributed to an atypical rainfall event in January 1992 (644 mm), which retarded leaf abscission.

Journal

Forest Ecology and ManagementElsevier

Published: Jun 1, 1995

References

  • Ecology of tropical dry forest
    Murphy, P.G.; Lugo, A.E.
  • Simulation of evapotranspiration and drainage from mature and clear-cut deciduous forest and young pine plantation
    Swift, L.W.; Swank, W.T.; Mankin, J.B.; Luxmoore, R.J.; Goldstein, R.A.

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