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采用分解袋法对自然和UV-B辐射滤减环境下的杉木凋落叶进行分解试验.结果表明:与对照相比,UV-B辐射滤减处理使杉木凋落叶的分解速率降低了69.6%(P<0.001),凋落叶中氮、磷和木质素的相对含量分别增加150%、83.3%和13.8%,抑制了钾和碳的释放.木质素光降解在杉木凋落叶分解过程中的作用不明显.UV-B辐射可以加快杉木凋落叶的分解,促进氮、磷、钾和碳的释放,以及杉木林凋落物层的营养周转速度,增加地表的碳通量,对杉木林的碳源或碳汇功能具有潜在的影响.
Decomposition experiments were carried out on the litter of Chinese fir litter with natural and UV-B radiation filtration by using the decomposition bag method.The results showed that the decomposition rate of Chinese litterfall was reduced by 69.6% compared with the control P <0.001), and the relative contents of nitrogen, phosphorus and lignin in litter increased by 150%, 83.3% and 13.8%, respectively, and inhibited the release of potassium and carbon.The role of photolysis of lignin in litter decomposition was not Obviously, UV-B radiation can accelerate the decomposition of Chinese fir leaf litter, promote the release of N, P, K and C and the nutrient turnover velocity of litter layer of Cunninghamia lanceolata, increase the surface carbon flux, Carbon sink function has potential implications.