Height is more important than light in determining leaf morphology in a tropical forest
Both within and between species, leaf physiological parameters are strongly related to leaf dry mass per area (LMA, g/m²), which has been found to increase from forest floor to canopy top in every forest where it has been measured. Although vertical LMA gradients in forests have historically been a...
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Published in | Ecology (Durham) Vol. 91; no. 6; pp. 1730 - 1739 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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United States
Ecological Society of America
01.06.2010
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Abstract | Both within and between species, leaf physiological parameters are strongly related to leaf dry mass per area (LMA, g/m²), which has been found to increase from forest floor to canopy top in every forest where it has been measured. Although vertical LMA gradients in forests have historically been attributed to a direct phenotypic response to light, an increasing number of recent studies have provided evidence that water limitation in the upper canopy can constrain foliar morphological adaptations to higher light levels. We measured height, light, and LMA of all species encountered along 45 vertical canopy transects across a Costa Rican tropical rain forest. LMA was correlated with light levels in the lower canopy until approximately 18 m sample height and 22% diffuse transmittance. Height showed a remarkably linear relationship with LMA throughout the entire vertical canopy profile for all species pooled and for each functional group individually (except epiphytes), possibly through the influence of gravity on leaf water potential and turgor pressure. Models of forest function may be greatly simplified by estimating LMAâcorrelated leaf physiological parameters solely from foliage height profiles, which in turn can be assessed with satelliteâ and aircraftâbased remote sensing. |
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AbstractList | Both within and between species, leaf physiological parameters are strongly related to leaf dry mass per area (LMA, g/m2), which has been found to increase from forest floor to canopy top in every forest where it has been measured. Although vertical LMA gradients in forests have historically been attributed to a direct phenotypic response to light, an increasing number of recent studies have provided evidence that water limitation in the upper canopy can constrain foliar morphological adaptations to higher light levels. We measured height, light, and LMA of all species encountered along 45 vertical canopy transects across a Costa Rican tropical rain forest. LMA was correlated with light levels in the lower canopy until approximately 18 m sample height and 22% diffuse transmittance. Height showed a remarkably linear relationship with LMA throughout the entire vertical canopy profile for all species pooled and for each functional group individually (except epiphytes), possibly through the influence of gravity on leaf water potential and turgor pressure. Models of forest function may be greatly simplified by estimating LMA-correlated leaf physiological parameters solely from foliage height profiles, which in turn can be assessed with satellite- and aircraft-based remote sensing. Both within and between species, leaf physiological parameters are strongly related to leaf dry mass per area (LMA, g/m²), which has been found to increase from forest floor to canopy top in every forest where it has been measured. Although vertical LMA gradients in forests have historically been attributed to a direct phenotypic response to light, an increasing number of recent studies have provided evidence that water limitation in the upper canopy can constrain foliar morphological adaptations to higher light levels. We measured height, light, and LMA of all species encountered along 45 vertical canopy transects across a Costa Rican tropical rain forest. LMA was correlated with light levels in the lower canopy until approximately 18 m sample height and 22% diffuse transmittance. Height showed a remarkably linear relationship with LMA throughout the entire vertical canopy profile for all species pooled and for each functional group individually (except epiphytes), possibly through the influence of gravity on leaf water potential and turgor pressure. Models of forest function may be greatly simplified by estimating LMAâcorrelated leaf physiological parameters solely from foliage height profiles, which in turn can be assessed with satelliteâ and aircraftâbased remote sensing. |
Author | Steven F. Oberbauer Michael G. Ryan Cavaleri, Molly A Deborah A. Clark David B. Clark |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/20583714$$D View this record in MEDLINE/PubMed |
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Snippet | Both within and between species, leaf physiological parameters are strongly related to leaf dry mass per area (LMA, g/m²), which has been found to increase... Both within and between species, leaf physiological parameters are strongly related to leaf dry mass per area (LMA, g/m2), which has been found to increase... |
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SubjectTerms | Adaptation, Physiological canopy Ecosystem epiphytes forest litter gravity leaf water potential leaves Light phenotype Plant Leaves - anatomy & histology Plant Leaves - physiology remote sensing transmittance Trees Tropical Climate tropical rain forests turgor |
Title | Height is more important than light in determining leaf morphology in a tropical forest |
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