生态学杂志2011，Vol.30Issue(9)：2045-2052,8.
光降解在凋落物分解中的作用
Roles of photodegradation in litter decomposition.
摘要
Abstract
In recent years, it has recognized that photodegradation possibly plays a key role in litter decomposition. This paper summarized the action mechanisms of photodegradation, roles of photodegradation in carbon and nutrient cycling, relationships between photodegradation and mi-erobial decomposition, and factors affecting photodegradation. Photodegradation has both positive and negative effects on litter decomposition. The positive effects lie in the photolysis and photoox-idation of organic matter, leading to the changes of litter chemistry, fragmentation, and facilitation to leaching, whereas the negative effects are related to the inhibition of microbial decomposition induced by strong light radiation. The C02 produced by the photochemical mineralization in the process of photodegradation is the main mechanism of the C loss from ecosystems. Besides UV, the blue and green light-wave bands in visible light can affect litter photodegradation. The photodegradation is affected by water status, litter chemical properties, and litter exposed area. It was suggested that the related research priorities in the future could be the research methods of photodegradation, the interactions between photodegradation and environmental factors, the spatial variance of photodegradation, and the relationships between photodegradation and microbial decomposition in the process of litter decomposition.关键词
凋落物光降解/微生物分解/碳循环/养分循环Key words
litter photodegradation/ microbial decomposition/ carbon cycling/ nutrient cycling.分类
农业科技引用本文复制引用
周丽,李彦,唐立松,黄刚..光降解在凋落物分解中的作用[J].生态学杂志,2011,30(9):2045-2052,8.基金项目
国家重点基础研究发展计划项目(2009CB825104)、国家自然科学基金项目(31000217)和西部博士(Y13A061001)资助. （2009CB825104）
