Fig. 6

Simulation of 9-year-old poplar tree structures, based on observations of Caraglio et al. (1990). Each year is divided into 60 CUs, and the trees are shown at CU 530. In total, there are three PAs. The GUs of PA 1 may contain two parts, a preformed part and a neoformed part. The extension period of each preformed part follows a binomial law (15, 1), while that of the neoformed part is (20, 0.8). At each CU, the probability of producing a metamer is 0.8. For axes of PA 2, which may also contain a preformed part and a neoformed part, the extension period of the preformed part follows a binomial law (10, 1), and the neoformed part (10, 0.8). At each CU, the probability of producing a metamer is 0.8. For PA 3, only preformed GUs is produced, whose extension period follows a binomial law (5, 1). At each CU, the probability of producing a metamer is 0.6