Daylight ultraviolet radiation and the photoinhibition of phytoplankton carbon uptake

Publisher Website
Google Scholar
Abstract
14C carbonate uptake by phytoplankton in quartz and laborator4y glass vessels was compared in full daylight. Carbon uptake in the Laboratory glass vessels was –25% higher during 1.5 and 3.7 h incubations. Covering the quartz vessels with 6 rum thick soda-lime glass led to carbon uptake rates 80% higher than in unshaded quartz bottles. The differences in carbon uptake rates can be explained by the transmittance characteristics of the different glass types (approximate cut-off wavelength for laboratory glass = 320 mm and for soda-lime glass = 350 mm). Additional expenrnents yielded preliminary data on the effective photoinhibiting spectrum in daylight (the product of the action spectrum of photoinhibition and the downwelling spectral irradiance at noon). It is concluded that at Latitudes of central Europe in the summer the donunant photoinhibition wavelength, during noon hours on a bright day, is between 320 nm and 360 nm.

This publication has 0 references indexed in Scilit: