生态与农村环境学报2017，Vol.33Issue(8)：762-768,7.DOI:10.11934/j.issn.1673-4831.2017.08.013
鄱阳湖枯水期CDOM光吸收特性与DOC浓度的定量关系研究
Optical Absorption Properties of Chromophoric Dissolvable Organic Matter ( CDOM ) and Their Quantitative Relationships With Dissolved Organic Carbon in the Poyang Lake in Dry Season
摘要
Abstract
Optical absorption properties of chromophoric dissolvable organic matter ( CDOM) in the waters of the Poyang Lake including estuaries and the main waterbody in the dry season of 2015 were studied and their relationships with dis?solved organic carbon ( DOC) discussed. Results show that CDOM absorption coefficient in the Poyang Lake at 254, 280, 350, and 440 nm ( wave length) varied in the range of 7. 86-20. 24, 5. 64-14. 58, 1. 46-4. 41 and 0. 36-1. 06 m-1 , re?spectively, and M value, an index characterizing relative molecule size, did in the range from 5. 27 to 7. 66. During the dry season, wetlands were a major factor affecting CDOM concentrations in the lake, whereas the five major incoming riv?ers did not have much contribution to CDOM. Among the numerous parameters, SR was the major index reflecting optical absorption properties of CDOM in the lake during the dry season. DOC in the dry season varied in the range from 1. 61 to 4. 86 mg·L-1 , with a mean value of 2. 31 mg·L-1 . CDOM optical absorption coefficient( a254 ,x) was positively related to DOC concentration ( y) . The relationship was fitted with the linear regression equation y=-0. 53+0. 27x and calibrated with the equation Adj. R2=0. 76, P<0. 01. Validation with the field measurements conducted in the Poyang Lake in Janu?ary 2016 demonstrates that it is feasible to use optical absorption properties of CDOM in the waterbody of the Poyang Lake during the dry season to explore DOC concentration in the lake water, which means that CDOM in the Poyang Lake in the dry season can be used as an indicator in the study on carbon pool in the lake.关键词
有色可溶性有机物(CDOM)/吸收系数/溶解性有机碳(DOC)/鄱阳湖Key words
chromophoric dissolved organic matter/absorption coefficient/dissolved organic carbon/Poyang Lake分类
资源环境引用本文复制引用
刘丽贞,黄琪,吴永明,吴代赦,游海林,邓觅..鄱阳湖枯水期CDOM光吸收特性与DOC浓度的定量关系研究[J].生态与农村环境学报,2017,33(8):762-768,7.基金项目
国家自然科学基金(41561093,41661102,41661018) （41561093,41661102,41661018）
江西省青年科学基金(20151BAB213033,20161BAB213076) （20151BAB213033,20161BAB213076）
江西省科学院引进博士项目(2014-YYB-30) （2014-YYB-30）
江西省科学院协同创新专项普惠制项目(2014-XTPH1-30) （2014-XTPH1-30）
江西省重大生态安全问题监控协同创新中心资助项目( JXS-EW-00) （ JXS-EW-00）
鄱阳湖湿地与流域研究教育部重点实验室开放基金( PK2015007) （ PK2015007）
