Figure 4.
Growth as determined by our heuristic allocation model. (a) The growth in the stem height (Hs)−sapwood area (As) plane and (b) the corresponding growth trajectory in the total tree height (Htot)−basal area plane. Initial allocation is focused on crown size growth. Once the switching crown size (1) is reached, allocation switches to stem height growth. Once the switching stem height is reached (marked (2)), the allocation strategy again switches to crown size. However, if the condition for simultaneous growth is met, the optimal growth trajectory will follow along an arc and allocation gradually shifts from full stem height investment to full crown size investment (marked (2′)). From mark (2)/mark (2′) crown size growth recommences and lasts until an optimal size is reached (marked (3)), where size growth stops, and seed production starts.