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- Coste, S, et al.
(författare)
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Assessing foliar chlorophyll contents with the SPAD-502 chlorophyll meter: 165 a calibration test with thirteen tree species of tropical rainforest in French Guiana
- 2010
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Ingår i: Annals of Forest Science. - 1286-4560. ; 67:6
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Tidskriftsartikel (refereegranskat)abstract
- • Chlorophyll meters such as the SPAD-502 offer a simple, inexpensive and rapid method to estimate foliar chlorophyll content. However, values provided by SPAD-502 are unitless and require empirical calibrations between SPAD units and extracted chlorophyll values. • Leaves of 13 tree species from the tropical rain forest in French Guiana were sampled to select the most appropriate calibration model among the often-used linear, polynomial and exponential models, in addition to a novel homographic model that has a natural asymptote. • The homographic model best accurately predicted total chlorophyll content (µg cm-2) from SPAD units (R² = 0.89). Inter-specific differences in the homographic model parameters explain less than 7% of the variation in chlorophyll content in our dataset. • The utility of the general homographic model for a variety of research and management applications clearly outweighs the slight loss of model accuracy due to the abandon of the species-effect.
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