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为了探究全球变暖对森林凋落物分解速率及养分释放的影响 ,笔者在跨气候带的大尺度下进行了森林凋落物的交互分解实验 .在热带的尖峰岭和亚热带的鼎湖山各选样地 1个 ,它们有相似的海拔高度、土壤类型、年均降雨量及干湿季节律 ,年均气温为主要差异 ,达 3 7℃ .各样地分别收集了 1 0种当地的优势树种的凋落叶 .其中 2个样地各自的优势种青皮和锥栗 ,2个样地均有的共同种荷木做为单种样 .1 0种凋落叶的等重量混合为混合样 ,共计6类凋落叶 ,交互置于 2个样地分解 .结果表明 :6类凋落叶在尖峰岭的分解速率显著大于在鼎湖山的分解速率 .凋落叶分解的表观Q1 0 在 3 7～ 7 5范围内 .在这个增温范围内 ,凋落叶分解加快的程度可达 1 36～ 3 0 6倍 ,鼎湖山凋落叶第 1年归还的N、P和C将分别增加 32 42、1 0 33和 74 1 1kg hm2 只在鼎湖山的分解中 ,分解速率常数k值与凋落叶初始质量参数木质素 N、木质素、木质素 P、木质素纤维素商 (HLQ)、C有显著的较高相关性 ,而在尖峰岭的分解中k值与凋落叶初始质量参数无显著相关性 .
In order to explore the impact of global warming on the litter decomposition rate and nutrient release, the author conducted an experiment on the interactive decomposition of forest litter under a large scale across the climatic zone.In the selected areas of Jianfengling and Subtropical Dinghushan 1, they have similar altitude, soil type, annual rainfall and wet-dry season law, the annual average temperature is the main difference, up to 37 ℃ .There are 10 kinds of local dominant species were collected litterfall Leaves.The two dominant species of peach and chestnut in two plots and the common species in two plots were single species.The equal weight of 10 kinds of litter was mixed and a total of six types of litter The results showed that the rate of decomposition of six litters in Jianfengling was significantly higher than that in Dinghushan. The apparent decomposition rate of litter leaves was in the range of 37 ~ 75. In this temperature range, litter decomposition accelerated up to 136 ~ 306 times, Dinghu litter fall in the first year returned N, P and C will increase 32 42,1 0 33 and 74 1 1kg hm2 only in the decomposition of Dinghushan, decomposition rate constant k value and The initial quality parameters of deciduous leaves were significantly correlated with lignin, lignin, lignin, HLQ and C, but there was no significant difference between k-value and initial litter leaf litter decomposition in Jianfengling Correlation .