摘要
经过１０４周对２个试验点上包括３种立竹度和２种林分组成共５种处理条件下的毛竹林凋落叶的分解过程研究，结果表明：分解初期失重迅速，而后趋于缓慢。分解剩余率与分解时间之间存在着指数函数关系。林分立竹度和组成对竹林凋落叶分解速度有着显著影响，竹栎混交林及立竹度为３０１５株／ｈｍ２纯竹林处理下，凋落叶的分解速度分别高于纯竹林的其它２种立竹度处理。剩余物中的Ｎ、Ｐ的浓度随分解呈增加趋势，两者变化模式相似，而Ｋ、Ｃａ、Ｍｇ的浓度则趋于减小。处理对Ｎ、Ｋ、Ｍｇ的浓度变化模式无显著影响。分解剩余物中各种养分浓度之间有着一定的关联。Ｎ、Ｐ在凋落叶分解初期为累积阶段，而后才释放归还，Ｋ、Ｃａ、Ｍｇ在整个分解过程中均为释放。分解失重决定着分解后期Ｎ、Ｐ养分的释放归还；而对于Ｋ、Ｃａ来说。
Decomposition of leaf litter originating from Moso bamboo stands in five stand structure treatments with different stand density and different species component was measured at two trial sites over 104 weeks during 1993 to 1995.The mass loss rate can be expressed as the exponential function of decomposing time.The trial treatments have marked influences on the mass loss rate,which was higher in bamboo oak mixed stands and in pure bamboo stands of density 3 015 culms·ha -1 than in bamboo stands with other treatments.Patterns of N concentration change in decomposing leaf litter is very similar to that of P.They both increased during the whole decomposing process,by contraries,concentration of K、Ca and Mg decreased.No obvious effect of the different treatments was gotten on the dynamics of concentration of N、K and Mg.N was initially accumulated and lately released,while K、Ca and Mg were released from the decomposing leaf litter during the whole observation period.The release of N and P during the late stage was mainly caused by mass loss,but to K and Ca release,leaching is more important than mass loss,especially in the early stage of the decomposition.
出处
《林业科学研究》
CSCD
北大核心
1997年第3期303-308,共6页
Forest Research
基金
浙江省自然科学基金
关键词
毛竹林
凋落叶分解
林分结构
养分积累
Moso stands leaf litter decomposition stand structure nutrient accumulation pattern
