Fluorescence methods for estimation of post-fire response of pine needles

Abstract

This paper discusses the possibility of using fluorescent methods to assess the thermal effects on Scots pine (Pinus sylvestris L.) needles’ assimilation apparatus. Assimilation apparatus of pine needles was proved to be able to reestablish after exposure to convective, simulating the effect of ground fire heat flow, though the recovery rate depends on the impact force. The analysis of fast and delayed fluorescence characteristics revealed differences in the thermostability of the Scots pine needles evidencing certain modification of physiological processes in plants under the influence of stress factors with a positive acclimation effect. The Scots pine needles grown after ground fire are more resistant to the repeating sublethal temperature, and this effect is maintained during the next growing season.