水环境中木质素光降解及其对有机物相关指示参数影响研究进展

Research progress in photodegradation of lignin in aquatic environments and its effect on relevant indicative parameters of organic matter

木质素是陆源有机物的重要组成部分,同时也是一种良好的陆源有机物的生物标志物。光化学降解是造成木质素在水环境中指示参数变化的重要原因。简要介绍了木质素的分子结构、特征指示参数和作为生物标志物的指示原理,重点介绍水环境中木质素光化学降解的机理及影响因素,总结了由木质素光降解引起的木质素指示参数及其他有机物相关参数(例如13 C同位素、CDOM)的变化特征,综述了陆地湖泊、河流、河口及海洋等水环境中木质素光降解的研究情况。最后,指出水环境中木质素光降解的一些研究方向,包括利用CDOM光谱特征研究光降解过程、与其他参数结合表征来源以及加强光降解与生物降解相互作用的研究等。

Lignin is one of the major components of terrestrial organic matter,as well as a good biomarker of terrestrial organic matter.The photodegradation of lignin in aquatic environments can significantly affect its indicative parameters.Firstly,this review introduced the structure of lignin and its application as a biomarker.Then,the mechanism and influencing factors of lignin photodegradation in aquatic environments were described and discussed.Meanwhile,the changes of lignin indicative parameters and other organic matter parameters(13 C isotope,CDOM,et al.)caused by the photodegradation,as well as researches about lignin photodegradation in rivers,estuaries and offshore were summarized.Finally,some possible research fields of lignin photodegradation in water environment were pointed out,including the use of CDOM optical spectrum measurements to characterize the photodegradation of lignin,combining with other parameters to characterize the sources and strengthening the study of the interaction between photodegradation and biodegradation.