First measurements of the C1- and C2- organic acids and aldehydes exchange between boreal lichens and the atmosphere

Abstract

We report on the initial results of measurements of the exchange of organic acids and aldehydes between lichens and the atmosphere under controlled climate chamber conditions. We found a formic acid deposition to lichens depending on thallus water content. Investigation of aldehyde exchange revealed a small and time limited emission of acetaldehyde which is enhanced by anoxic conditions. Formaldehyde emission was never observed.