L'Azione Fisiologica del Nichel Sulle Piante di un Terreno Serpenitinoso

Abstract

The Author, on the basis of numerous results of pollen analysis on turfy-clayey deposits especially in Delta Padano, shows the gradual impoverishment, the main ancient species (Pinus haploxylon, Abies nordmanniana, Tsuga, Cedrus, Carya, Pterocarya, Zelkova, Castanea latifolia) suffered from during middle and upper Pleistocene.