Analysis about CWD indicates that a five-class decay classification system of fallen wood is developed,and the decomposition time of each class is 4a,18a,38a,68a and 92a,respectively.

• 基于对粗死木质残体的调查分析,表明鳞毛蕨天山云杉林的倒木粗死木质残体从外部形态特征上可划分为5级,平均分解时间依次为4a、18a、38a、68a和92a。