Abstract:

Growth characteristic of Populus×xiaohe i plantaion had been studied in sand land of North China. The results showed: Tree height growth of P.×xiao hei was earlier than the breast diameter growth, the competition for resources grew cruelly among the trees in later growth period; The maximum of current annual increment and mean annual increment of tree height appeared nearly synchronously, so did the breast diameter, But the maximum of current annual increment of timber volume appeared much more earlier than the maximum of mean annual increment; The current annual increment and mean annual increment of tree height, breast diameter and timber volume were respectively intersected in about 6, 10 and close to 16 a; The growth process of P.×xiaohei was divided into four periods: 0～3 a was the young stand period, 4～14 a was the fastgrowing period, 15～16 a was the near mature period, 17～26 a was the overmature period; The rotation of P.×xiaohei was 16 a.

Key words: Populus×xiaohei, sand land of North China, plantation, growth characteristic