UV-B辐射对香樟凋落叶化学组成和分解的影响  

Effect of UV-B Radiation on Chemical Composition and Subsequent Decomposition of Leaf Litter of Cinnamomum camphora

作　　者：卢娟[1] 卜涛[1] 郭宝华 朱鹏飞[1] 江洪[1] 宋新章[1] 

机构地区：[1]浙江农林大学,亚热带森林培育国家重点实验室培育基地,浙江省森林生态系统碳循环与固碳减排重点实验室,浙江临安311300 [2]国际竹藤中心,北京100102

出　　处：《浙江林业科技》2013年第4期68-73,共6页Journal of Zhejiang Forestry Science and Technology

基　　金：国家自然科学基金项目(31070440;30800152);浙江省自然科学基金项目(Y5090007);浙江农林大学人才启动项目(2012FR023)

摘　　要：采用模拟UV-B辐射增强方法研究了UV-B辐射香樟(Cinnamanun camphora)叶片化学组成及其凋落后分解和养分释放的影响。结果表明:UV-B辐射增强导致香樟凋落叶中的N、P、K和C含量分别比对照组显著减少了36.0%、14.3%、42.7%和7.4%(p<0.05),致使凋落叶中的C:N、木质素:N和C:P比分别显著增加了44.7%、77.1%和7.3%(P<0.05),木质素含量显著增加13.3%;在之后1 a分解过程中,生长期间接受增强UV-B辐射的凋落叶分解的更快,但与对照组差异不显著(P>0.05)。An experiment was carried out on the effects of UV-B radiation on leaf litter chemical composition and subsequent decomposition in humid subtropical forest systems. The leaf litter was derived from Cinnamornum camphora seedlings exposed to elevated and ambient ultraviolet B （UV-B） radiation treatments during growth for one year. The results showed that UV-B treatment significantly decreased the original N, P, K and C content in leaf litter by 36.0%, 14.3%, 42.7% and 7.4%, and increased the ratios of C：N, lignin：N and C：P in leaf litter by 44.7%, 77.1% and 7.3%. The decomposition of leaf litter derived from seedlings exposed to elevated UV-B treatment during growth was faster, but did not show significant difference with that of the control.

关 键 词：UV-B辐射 香樟 凋落叶分解 化学组成 

分 类 号：S789.4[农业科学—林学]