摘要
内陆水体(湖泊、水库、河流)在全球碳循环过程中起着重要作用,其中有色溶解有机物(CDOM)是内陆水体中溶解态有机物质,对水体的光学特性和生物地球化学过程具有重要的影响.由于受到时空变化和人类活动的影响,内陆水体的CDOM组分、来源与光学性质较为复杂.不同区域内或者同一研究区不同的水体类型,CDOM光学特性之间存在着较大差异,通常选取CDOM的吸收系数表征CDOM浓度,通过三维荧光光谱(EEM)表征CDOM荧光组分与来源.首先论述了CDOM的重要作用,并从文献计量学的角度分析了CDOM近20多年的研究进展;其次阐述了CDOM吸收与荧光特性的变化特征,进而分析CDOM荧光组分或者吸收系数变化的驱动因素,阐明了光化学作用与微生物作用对其组分与吸收的影响;最后根据CDOM与溶解有机碳(DOC)的关系,简述了遥感在估算内陆水体CDOM及DOC方面的作用,并讨论了CDOM研究的不足与展望.
Inland waters( including lakes,reservoirs and rivers) play significant roles in global carbon cycles.Colored dissolved organic matter( CDOM) is the dissolved organic matter in inland waters,which have important effect on the optical characteristics and biogeochemical process of waters. The compositions,sources and optical features of CDOM for inland waters could be influenced by the spatial variation and human activities. There are large variations of CDOM characteristics in different regions or the various types of waters in the same regions,CDOM absorption coefficient is generally used to represent CDOM concentration and fluorescence excitation-emission matrix( EEMs) was used to represent CDOM fluorescent compositions and sources. Firstly,in this study the significance of CDOM is demonstrated and the research progress of CDOM study for recent 20 years is analyzed through bibliometrics method. Secondly,the variations of CDOM absorption and fluorescence characteristics are analyzed and then the factors for the variation of CDOM fluorescent compositions and absorption coefficients are also analyzed and the effect of photo-chemical process and microbial process on CDOM absorption and fluorescence are demonstrated. Finally,according to the relationship between CDOM and DOC,the role of remote sensing techniques for the estimation of CDOM and DOC for inland waters is described and the shortage and prospect of CDOM study is discussed as well.
引文
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