1. Chlorophyll fluorescence and gas exchange measurements in field research: an ecological case study.
- Author
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Bucher, S. F., Bernhardt-Römermann, M., and Römermann, C.
- Subjects
CHLOROPHYLL spectra ,GAS exchange in plants ,PHOTOSYNTHETIC rates ,CARBON isotopes ,HERBACEOUS plants ,RED clover - Abstract
We tested whether cheap and quick chlorophyll (Chl) fluorescence can be used in ecophysiological field studies as proxies for gas-exchange measurements. We measured net photosynthetic rate at saturating irradiance and ambient atmospheric CO
2 concentrations (PNsat ), maximum carboxylation rate (Vcmax ), maximum quantum yield of PSII (Fv /Fm ), the performance index (PIabs), leaf nitrogen (Narea), and carbon isotope discrimination (Δ13 C) within four herbaceous species along two elevational gradients. We analysed the relationship between Chl fluorescence and gas-exchange parameters and their link to indirect assessment of plant performance via ecophysiological traits. Fv /Fm showed no relationship to PNsat and only weak relationships to Vcmax . PIabs was positively related to PNsat and Vcmax . PIabs , PNsat , and Vcmax were positively associated with Narea and negatively to Δ13 C, whereas Fv /Fm showed no relationship to Narea and a positive to Δ13 C. Thus, PIabs might be suitable to characterize the photosynthetic activity when aiming on large numbers of samples. [ABSTRACT FROM AUTHOR]- Published
- 2018
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