Integrating fire-scar, charcoal and fungal spore data to study fire events in the boreal forest of northern Europe ...

• Main Authors: Stivrins, Normunds, Aakala, Tuomas, Ilvonen, Liisa, Pasanen, Leena, Kuuluvainen, Timo, Vasander, Harri, Gałka, Mariusz, Disbrey, Helena R, Liepins, Janis, Holmström, Lasse, Seppä, Heikki
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Figshare 2019
• Subjects: Geography; History; Fennoscandian
• Online Access: https://dx.doi.org/10.25384/sage.c.4538567; https://sage.figshare.com/collections/Integrating_fire-scar_charcoal_and_fungal_spore_data_to_study_fire_events_in_the_boreal_forest_of_northern_Europe/4538567

Fire is a major disturbance agent in the boreal forest, influencing many current and future ecosystem conditions and services. Surprisingly few studies have attempted to improve the accuracy of fire-event reconstructions even though the estimates of the occurrence of past fires may be biased, influencing the reliability of the models employing those data (e.g. C stock, cycle). This study aimed to demonstrate how three types of fire proxies – fire scars from tree rings, sedimentary charcoal and, for the first time in this context, fungal spores of Neurospora – can be integrated to achieve a better understanding of past fire dynamics. By studying charcoal and Neurospora from sediment cores from forest hollows, and the fire scars from tree rings in their surroundings in the southern Fennoscandian and western Russian boreal forest, we produced composite fire-event data sets and fire-event frequencies, and estimated fire return intervals. Our estimates show that the fire return interval varied between 126 and 237 ...