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On Drawing up the Variable-density Yield Table for Chinese Fir Plantation

Jiang Xidian;Cai Li juan(Resources & Enviroment Dept. Fujian College of Forestry. Nanping 353001 )Lan Jingde;Cheng Yisen (Shaowu Forestry Committee of Fujian. 354000)Wu Zhongyuan;Jian Xiongliang(Resources & Enviroment Dept. Fujian College of Forestry. Nan  
By using Richards equation.the growthmodel of Chinese fir plantation was built,while input variates tvers stand age, site indexes and stand desities. and output were totle basal area of stands and even diameters al breast height, error analysis showed that the model was fit. Based on it. foe variable-density yield table for Chinese fir Plantation was drown up.
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