Osservazioni sopra le oscillazioni giornaliere della CO2 dell'aria a disposizione delle piante superiori nei diversi periodi dell'anno

Summary

At intervals of about 4 days and over the whole extension of the respective cycles, samples of air were taken in the morning, noon and evening in fields of wheat, rye, oats, corn, clover and oilnavew bird rape; these samples, taken at foliage level, were assessed for their CO₂ contents. The results were expressed both in form of tables as well of diagrams. In this manner the daily and annual periodical pattern of the CO₂ contents in the air is shown. The reasons of this periodical pattern are discussed with particular reference to the action developed by the surronding conditions (such as temperature, water availability, etc.) acting on the soil microflora, by which CO₂ is produced, and on the CO₂ consumption by green plants, as well as to the relationships existing between CO₂ consumption and different biological types of plants.