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The effect of tree height and light availability on photosynthetic leaf traits of four neotropical species differing in shade tolerance
Author(s) -
Rijkers T.,
Pons T. L.,
Bongers F.
Publication year - 2000
Publication title -
functional ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 154
eISSN - 1365-2435
pISSN - 0269-8463
DOI - 10.1046/j.1365-2435.2000.00395.x
Subject(s) - biology , photosynthesis , botany , shade tolerance , canopy , chlorophyll , specific leaf area , acclimatization , stomatal conductance , horticulture
1. Light‐saturated rate of photosynthesis ( A max ), nitrogen (N), chlorophyll (Chl) content and leaf mass per unit area (LMA) were measured in leaves of trees of different heights along a natural light gradient in a French Guiana rain forest. The following four species, arranged in order from most shade‐tolerant to pioneer, were studied: Duguetia surinamensis, Vouacapoua americana, Dicorynia guianensis and Goupia glabra . Light availability of trees was estimated using hemispherical photography. 2. The pioneer species Goupia had the lowest LMA and leaf N on both an area and mass basis, whereas Duguetia had the highest values. In general, leaf variables of Vouacapoua and Dicorynia tended to be intermediates. Because A max /area was similar among species, Goupia showed both a much higher light‐saturated photosynthetic nitrogen‐use efficiency (PNUE max ) and A max /mass. Leaves of Vouacapoua demonstrated the greatest plasticity in A max /area, particularly in small saplings. 3. A distinction could be made between the effect of tree height and light availability on the structural, i.e. LMA, and photosynthetic leaf characteristics of all four species. The direction and magnitude of the variation in variables were similar among species. 4. LMA was the key variable that mainly determined variation in the other leaf variables along tree height and light availability gradients, with the exception of changes in chlorophyll concentration. A max /area, N/area, LMA and stomatal conductance to water vapour ( g s ) increased, whereas Chl/mass decreased, with both increasing tree height and canopy openness. A max /mass, PNUE max and A max /Chl increased with increasing openness only. N/mass and Chl/area were independent of tree height and openness, except for small saplings of Goupia which had a much lower Chl/area.