Abstract
The selective light-absorption of a typically “sodic” water (Lake Nagyszekto, Great Hungarian Plain) and its changes during a year have been determined by monochromator measurements. It has been found, that in all seasons the rays of the red spectral region have the lowest extinction coefficient (i.e. these rays penetrate to the deepest layers: after a certain depth, only red light carries energy). But just this spectral region has the greatest photosynthetic activity. This gives an explanation for the trophity and extraordinarily high productivity of sodic lakes.
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