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采用凋落物分解袋法,研究了亚热带常绿阔叶林区马尾松、柳杉、杉木、香樟、红椿、麻栎6个典型树种凋落叶的Ca、Mg、Mn在第一个分解年不同雨热季节的释放特征.结果表明:经历1年的分解,6种凋落叶Ca、Mg、Mn释放率分别为-13.8%~92.3%、4.0%~64.8%和41.6%~81.1%.马尾松和香樟凋落叶Ca释放动态呈现富集-释放模式,其余4种凋落叶整体上呈现释放的模式;香樟凋落叶Mg释放动态呈现富集-释放模式,其余5种凋落叶呈现直接释放模式;柳杉和红椿凋落叶Mn释放动态呈现富集-释放模式,其余4种凋落叶呈现直接释放模式.凋落叶Ca、Mg、Mn的释放明显受到季节性降雨的影响,且因凋落叶种类不同而有差异.Ca、Mg、Mn在雨季的释放率和释放量均高于旱季.初始养分含量和降雨量是影响凋落物分解过程元素释放的重要因子.
The litter decomposition bag method was used to study the effects of Ca, Mg and Mn on leaf litter decomposition of six typical tree species of Pinus massoniana, Cryptomeria japonica, Cunninghamia lanceolata, Cinnamomum camphora, Toona sinensis and Quercus acutissima in the subtropical evergreen broad-leaved forest. The results showed that the release rates of Ca, Mg and Mn in the six litters were -13.8% -92.3%, 4.0% -64.8% and 41.6% -81.1%, respectively, after one year of decomposition. The Ca release dynamics of litter and camphor litter presented a pattern of enrichment-release, and the four litterfalls showed a pattern of release as a whole. Mg released from the litter of Pinus camphorata showed a pattern of enrichment-release, and the other five litters showed direct release patterns ; The release of Mn from the litters of Cryptomeria fortunei and Toona sinensis showed dynamic enrichment-release patterns, and the other four kinds of leaf litter showed direct release patterns.The release of Ca, Mg and Mn from litter was significantly affected by seasonal rainfall, While Ca, Mg and Mn released in the rainy season were higher than those in the dry season.The initial nutrient content and rainfall were the important factors affecting the release of elements in litter decomposition process.