Fig. 4From: Management breaks the natural productivity-biodiversity relationship in forests and grassland: an opinionGrowth of managed age class coniferous and deciduous forest in Thuringia, Germany, and Boisoara, Romanian as related to tree species number (Bouriaud et al. 2016). The lower vertical line and equation describes the average change of volume increment with tree species number while the upper blue line and equation describes the change of volume increment with tree diversity of the single highest value at each level of diversityBack to article page