Research on the growth characteristics of Populus × euramiricana cv. 'San Martino' (I-72/58) on beach land of Yangtze River.

The study on forest growth characteristics was conducted on Populus×euramiricana cv.'San Martino'(I-72/58)on beach land of Yangtze River.The results indicated:Populus×euramiricana cv.'San Martino'(I-72/58)growth process could be divided into 3 stages: 1—4 a was the young stand stage,5—10 a was the fast-growing stage,11—14 a was the near mature stage.The fast-growing stage of tree height was in 3—8 a,that of the breast diameter was in 5—10 a,and that of the timber volume was in 6—10 a.Populus×euramiricana cv.'San Martino'(I-72/58)' tree height grew earlier than the breast diameter,and Populus×euramiricana cv.'San Martino'(I-72/58)' later period grew by the breast diameter and timber volume growth primarily;Compared to the mean annual increment maximum,the current annual increment maximum of the tree height arrived much more earlier,so as the breast diameter;The current annual increment of tree height was intersected with the mean annual increment in about 7 a,the current annual increment and mean annual increment of the breast diameter intersected in 9 a;The current annual increment and the mean annual increment of the timber volume was not able to intersect in 14 a,that means that the Populus×euramiricana cv.'San Martino'(I-72/58)'growth process could not reach its quantitative maturity period,its period was in 14 a.Competition of the tree height among individual trees was primarily in 3—8 a;Competitions of the breast diameter and timber volume among individual trees were primarily in later period.With the Richards equation was used to fir the breast diameter,the tree height and the timber volume of Populus×euramiricana cv.'San Martino'(I-72/58),the fitting effect was excellent.