UV-B辐射对杜英凋落叶化学组成及其分解的影响  

Effects of UV-B radiation on the leaf litter chemistry and subsequent decomposition of Elaeocarpus sylvestris

作　　者：郭宝华 卜涛[2] 王志坤[2] 宋新章[2] 刘广路 范少辉 

机构地区：[1]国际竹藤中心竹藤科学与技术重点实验室,北京100102 [2]浙江农林大学,浙江临安311300

出　　处：《生态学杂志》2013年第9期2314-2319,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30800152)资助

摘　　要：采用模拟UV-B辐射增强方法研究了UV-B辐射对中国亚热带常见树种杜英(Elaeocarpus sylvestris)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:增强的UV-B辐射显著增加了杜英凋落叶中的N含量,显著降低了凋落叶中的C、P、K、木质素含量和C∶N、木质素∶N;在分解过程中,对照和UV-B辐射增强处理凋落叶的分解差异不显著,在前10个月的分解过程中均发生了N的富集,且对照凋落叶的N富集程度显著强于UV-B辐射增强处理;2组处理下凋落叶均发生了P和K的释放,但处理间差异不显著。A simulation experiment was conducted to study the effects of ultraviolet B （UV-B） radiation on the leaf litter chemistry and subsequent decomposition of Elaeocarpus sylvestris, a common tree species in China subtropical zone. The leaf litter was derived from E. sylvestris seedlings, and exposed to elevated （10% enhancement） UV-B radiation and ambient UV-B radi- ation for one year. Elevated UV-B radiation increased the leaf litter N content significantly, but decreased the leaf litter C, P, K, and lignin contents and C ： N and ]ignin ： N ratios. The de- composition of the leaf litter derived from E. sylvestris seedlings and exposed to elevated UV-B ra- diation had no significant difference with that in ambient UV-B treatment. During the first 10 months of decomposition, the N enrichment occurred, and the enrichment degree was significant- ly higher in treatment ambient UV-B radiation than in treatment elevated UV-B radiation. The re- lease of P and K occurred during litter decomposition, but had no significant difference between the two treatments.

关 键 词：紫外线-B辐射 凋落叶分解 基质质量 养分释放 

分 类 号：Q947[生物学—植物学]