【摘要】 研究了鼎湖山自然保护区内季风常绿阔叶林林下凋落物层现存量及其化学性质，研究结果表明：１）林下凋落物现存量与年凋落物总量相当，分别为８．７４和８．８４（７～１１）ｔｈｍ－２，系统养分循环速率参数为０．９９，循环强度强烈，说明枯枝落叶分解快，养分周转快；２）营养元素在凋落物层中的含量分布格局为：Ｎ、Ｃａ、Ｍｇ、Ｍｎ元素未分解层（Ｌ层）＞半分解层（Ｆ层）＞已分解层（Ｙ层），Ｐ、Ｋ、Ｆｅ则是Ｙ层＞Ｆ层＞Ｌ层；３）元素贮量（ｋｇｈｍ－２），Ｎ１０２．０８，Ｐ４．３３，Ｋ４８．９４，Ｃａ１７．３８，Ｍｇ１０．４３，Ｆｅ５４．８７，Ｍｎ１．８０，在各亚层中的分布有Ｌ层＞Ｆ层＞Ｙ层（Ｎ、Ｐ、Ｃａ、Ｍｇ、Ｍｎ），Ｙ层＞Ｆ层＞Ｌ层（Ｋ、Ｆｅ）；４）有机物质含量和贮量均为Ｌ层＞Ｆ层＞Ｙ层；５）林下凋落物的分解过程是一个养分释放过程，这一过程和营养元素及有机物质在各亚层的分布格局对林木生长极为有利。体现了作为顶极群落的季风常绿阔叶林生态系统本身在养分循环和利用效率的优越性。更多还原

【Abstract】 The standing pool and chemical properties of the forest floor litter in Dinghushan monsoon evergreen broadleaved forest were studied in this paper.Rusults show that the average standing pool was 874 thm-2,similar to the annual litter fall(884t·hm-2),and the nutrient turnover rate parameter of the system was 099,indicating a high tunover rate of the forest litter.The elements contents can be ordered as follows:undecomposed layer(Y layer)>semidecomposed layer(F layer)>decomposed layer (Y layer) for N,Ca,Mg,Mn and Y layer>F layer for P,K,Fe.The pool(kg·hm-2) of elements was 10208(N),433(P),4894(K),1738(Ca),1043(Mg),5487(Fe) and 180(Mn),respectively.They can be ordered as follows:L layer>F layer>Y layer for N,P,Ca,Mn,and Y layerF>layer>L layer for K,Fe.The content and pool of the organic matter can be ordered as follows:L layer >F layer>Y layer.The decomposition of forest floor was a process of nutrient release.The process and the allocation pattern in varoius layers provided an advantageous condition for vegetation growth.更多还原