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.
出处
《浙江林业科技》
北大核心
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)
关键词
UV-B辐射
香樟
凋落叶分解
化学组成
UV-B radiation
Cinnamomum camphora
leaf litter decomposition
chemical composition