Effect of slope on growth of three hard broadleaved tree species in Northeast China

Analysis on tree hegiht and diameter(DBH) growth of the belt-mixed plantations of Fraxinus mandshurica,Phellodendron amurense and Juglans mandshurica(panted in 1986) were conducted by using the methods of variance analysis and multiple comparison. The results show that the position of slope is a significant physical factor to affect height growth and DBH growth. Fraxinus mandshurica grew best at meddle hill. Juglans mandshurica grew best at mid-down slope, and Phellodendron amurense grew best at down slope. The analysis of the positive edge effect was also made for belt-mixed plantation of Juglans mandshurica and Larix dahurica. The result indicated that Larix dahurica presented positive edge effect to growth of Juglans mandshurica present.