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Effects of UV-B Radiation on Leaf Litter Decomposition in Humid Subtropical Region in China

UV-B辐射对亚热带森林凋落叶分解的影响


采用分解袋法研究自然和UV-B辐射滤减2种环境下6种亚热带代表性树种(杉木、马尾松、木荷、香樟、青冈和甜槠)凋落叶的分解情况。结果表明: 除个别分解阶段外,各树种凋落叶在2种UV-B辐射环境下的干质量剩余率均存在显著差异,且随着分解时间延长,差异逐渐加大; 与对照相比,UV-B辐射滤减显著降低了6个树种凋落叶的分解速率(P<0.01),降幅为33.3%~69.6%,对香樟凋落叶分解的影响最小,对杉木凋落叶分解的影响最大; UV-B辐射处理和凋落物类型对凋落叶的分解速率均有极显著影响(P<0.001),以UV-B辐射的影响更强烈; 自然和UV-B辐射滤减环境下凋落叶的分解速率均与C:N呈显著负相关(P <0.05)。

The leaf litter decomposition of six representative tree species, Cunninghamia lanceolata, Pinus massoniana, Schima superba, Cinnamomum camphora, Cyclobalanopsis glauca and Castanopsis eyeri, in subtropical region was investigated with litterbag method under ambient and reduced ultraviolet-B (UV-B) radiation (22.1% below ambient) treatments. The results showed that there were differences in litter mass remaining rates of each species under two UV-B radiation treatments, except for a few decay stages during decomposition, and the difference became more obvious with decay time. The reduced UV-B significantly decreased the litter decomposition rates of six species by an extent from 33.3% for C. camphora to 69.6% for C. lanceolata (P<0.01). Both UV-B radiation treatment and litter type significantly affected litter decomposition rate (P<0.001), with a stronger effect of UV-B radiation than litter type. There were significantly negative correlations between decomposition rate and C:N ratio of leaf litter under both ambient and reduced UV-B radiation treatments (P<0.05).


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