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采用凋落物分解袋法,研究了神农架不同海拔3种典型森林凋落物的分解动态.结果表明:依据分解速率,常绿阔叶林、常绿落叶阔叶混交林和落叶阔叶林3种典型森林凋落物的分解过程明显分为两个阶段,前期(0~360 d)凋落物的质量损失率为后期(361~720 d)的2.62~4.08倍,前期的分解速率分别为后期的2.71、1.72和2.69倍.凋落物分解95%所需的时间分别为3.84、4.54和4.16 a.分解后期凋落物的分解速率与C/N及N、半纤维素、纤维素、木质素含量均呈显著相关关系.
The litter decomposition bag method was used to study the decomposition dynamics of litter in three typical forest litters at different elevations in Shennongjia.The results showed that according to decomposition rate, three kinds of typical evergreen broad-leaved forest, evergreen and deciduous broad- The decomposition process of forest litter is obviously divided into two stages. The mass loss rate of litter in the early stage (0 ~ 360 d) is 2.62 ~ 4.08 times of that in the later stage (361 ~ 720 d), and the decomposition rate in the early stage is 2.71, 1.72 and 2.69 times respectively.The litter decomposition 95% of the time required were 3.84, 4.54 and 4.16 a respectively.The litter decomposition rate and C / N and N, hemicellulose, cellulose and lignin contents in late decomposition stage were all significant relationship.