Geographical Gradient of Fungal Decay Type in Norway Spruce Logs in Europe and Its Impact onSeedling Establishment | Geographical Gradient of Fungal Decay Type inNorway Spruce Logs in Europe and Its Impact onSeedling Establishment
2025
Fukasawa, Yu | Orman, Olga | Pouska, Václav | Bace, Radek | Panayotov, Momchil | Tsvetanov, Nickolay | Zíbarova, Lucie | Nordén, Jenni | Kawasaki, Yuki | Mikoláš, Martin | Polemis, Elias | Král, Kamil | Přívětivý, Tomáš | Svoboda, Miroslav
Aim: Norway spruce (Picea abies) is a dominant tree species across Eurasia, and is known to regenerate on decaying logs.Understanding its regeneration dynamics is crucial for predicting forest sustainability under climate change. The decay typeof the logs, indicative of fungal decay capabilities of lignin and holocellulose and traditionally categorised into white rot andbrown rot, markedly influences spruce seedling density on the logs, because brown rot reduces their establishment. As fungaldistribution and wood decay types are affected by macroclimate, the success of spruce seedling establishment is expected tovary continentally and may be further influenced by climate change. The goal of the present study is to examine the relationshipbetween decay type frequencies and spruce seedling densities on decaying logs, assessing effects on regeneration success alonga climatic gradient.Location: Fifteen sites in six European countries.Taxa: Norway spruce (Picea abies [L.] H. Karst.).Methods: We collected wood samples from spruce logs naturally decaying in the forest to evaluate their decay types. Spruceseedling numbers were recorded on the logs. The occurrence of certain decay types, seedling density, and their relationshipswith climate, stand, and log variables were analysed using generalised linear mixed models (GLMM) and structural equationmodelling (SEM).Results: White rot type of decay was dominating in central Europe compared with southern and northern Europe, where brownrot was prevalent. Spruce seedling densities were positively correlated with white rot in heartwood, which was explained by highprecipitation seasonality in central Europe. brown rot | climate | decay type | nurse logs | Picea abies | white rot
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