Annual report 2021

As expected, the excellent seed year 2020 was followed by a year without seed production (no mast) in all main tree species. Among the total of over 1300 observations, there were a few silver fir stands with partial mast and one each with half and full mast.

Fig. 1: Map of observed and modelled seed production of Norway spruce (Picea abies) in 2021 (left). Observations of seed production along the altitudinal gradient (right).
Fig. 2: Map of observed and modelled seed production of silver fir (Abies alba) in 2021 (left). Observations of seed production along the altitudinal gradient (right).
Fig. 3: Map of observed and modelled seed production of European beech (Fagus sylvatica) in 2021 (left). Observations of seed production along the altitudinal gradient (right).
Fig. 4: Map of observed and modelled seed production of oaks (Quercus petraea, Quercus robur, Quercus pubescens) in 2021 (left). Observations of seed production along the altitudinal gradient (right).