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Affection of Terrain Factors on Growth of Plantation Chinese fir in High Altitude Mountains in Eastern Fujian Province

LU Ji-che(Forest Farm of Gufeng in Pingnan County,Pingnan,Fujian 352300,China)  
The orthogonal design with five terrain factors under two levels was performed to systematically analyze the variation rules on growth of 14-year-old plantation Chinese fir.The results of each terrain factor affecting diameter and height of the plantation Chinese were obtained.The affecting intensity was slope shapesitedirectionaltitudegradient.The affecting intensity on its crown width was slope shapesitedirectiongradientaltitude.The affecting intensity on its height under branches was slope shapesitedirectionaltitudegradient.Slope shape was the most important factor which affected diameter,height and height under branch of plantation Chinese fir.Slope site was the second important factor which only affected height of plantation Chinese fir.The first affection factor affecting on the growth of plantation Chinese fir was slope shape,then slope site.Slope direction,altitude and gradient(45°) were not the significant factors affecting plantation Chinese fir.
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