Effect of Betula alnoides on the Afforestation of Different Exposures

[Objective]The aim was to research the effect of exposure on the afforestation of man-made forest of Betula alnoides.[Method]The investigated plots of 3 repeats were set in sunny slope,half-sunny slope,shady slope and half-shady slope at elevations of 450,550 and 600 m resp.in experimental afforestation field and the afforestation experiment of man-made forest of B.alnoides was performed for evaluating the effect of exposure on the growth of B.alnoides.[Result]All the test exposures showed significant effect on the height,diameter and capacity growth of B.alnoides.The order of average tree heights of different exposures was: shady slope half-shady slope half-sunny slope sunny slope and the average tree height of shady slope was 7.9% higher than that of sunny slope.The order of average diameters at breast height of different exposures was: shady slope half-shady slope = half-sunny slope sunny slope and the average diameters at breast height of shady slope was 11.1% larger than that of sunny slope.The order of average single-plant capacities of different exposures was: shady slope half-shady slope half-sunny slope sunny slope and the average single-plant capacities of shady slope was 33.0% more than that of sunny slope.[Conclusion]The effect of exposure on the growth of B.alnoides was significant and the growth of B.alnoides of shady slope was better than that of sunny slope.