UV-B辐射对植物残体分解的影响及其机理

Effects of UV-B Radiation on Litter Decomposition and Mechanism

UV-B辐射对植物残体分解的影响在植物营养循环中起着重要的作用,就UV-B辐射对植物残体分解的影响及其机理进行了综述。UV-B辐射对植物残体分解的影响包括直接影响和间接影响。直接影响指分解期接受UV-B辐射,从而对分解者产生直接作用以及光降解,这与植物类型、微生物对UV-B辐射响应的种内和种间的差异、微生物的色素、微生物的特性、环境因素等相关。间接影响是指植物生长期接受UV-B辐射,导致植物化学成分的改变,从而对分解者产生影响,这些化合物包括丹宁、木质素等酚类化合物。

This article mainly outlines effects of UV-B radiation on litter decomposition and mechanism.The effects of UV-B radiation on litter decomposition include direct effects and indirect effects,respectively.The direct effects mean UV-B irradiation affect decomposer and photodegradation during decomposition period.The direct affects relate to the functional types on plants,the interspecific differences and intraspecific differences of microorganism responses to UV-B radiation,the pigments and characters of microorganisms,and the environmental factors.The indirect effects are related to the changes of chemical compositions in plant,which can alter litter decompositions.These chemicals include mainly phenolic compounds,such as tannis and lignin,which are changed by UV-B radiation during plant growth stages.In addition,effects of UV-B radiation on litter decomposition significantly affect nutrient cycling.