title: [Dissolved organic matter release of Zizania caduciflora and Phragmites australis from Lake Dianchi].
abstract: Ground dry leaves of two emerged macrophytes Zinania Caduciflora and Phragmites australis from Lake Dianchi were soaked in distilled water in laboratory to track their DOM release process. The results showed that: (1) during soaking, concentration of DOM which was released to the overlying water by the two species increased at first, then decreased and increased again at last. Concentrations of DOC, DON, and DOP released by both species reached their peaks at the 8th, 8th, and 24th hour, respectively; (2) the two species showed the same DOM release trend, i.e., release rates and intensities of DOC, DON, and DOP by both species reached the peaks at the 8th hour, and for both of them, the release rates and intensities of DOC, DON, and DOP at the 8th hour followed the order of DOC > DON > DOP; (3) the SUVA254 value obtained by the UV-visible spectroscopy increased at first and then decreased; (4) Fourier transform infrared (FT-IR) spectroscopy showed that the characteristic peak -OH disappeared during the decomposition process; (5) intensity of the humic-acid fluorescence peak as showed by the 3D-EEM fluorescence intensity (F/DOC) increased along with degradation.
authors.affiliation: School of Geography Science, Nanjing Normal University, Nanjing 210023, China. xie705049124@126.com
authors.forename: Li
authors.initials: L
authors.lastname: Xie
authors.forename: Hao
authors.initials: H
authors.lastname: Yang
authors.forename: Xiao-xia
authors.initials: XX
authors.lastname: Qu
authors.forename: Yuan-rong
authors.initials: YR
authors.lastname: Zhu
authors.forename: Yuan-bo
authors.initials: YB
authors.lastname: Yan
authors.forename: Ming-li
authors.initials: ML
authors.lastname: Zhang
authors.forename: Feng-nhang
authors.initials: FN
authors.lastname: Wu
mesh_terms: D002244:Carbon / Q000032:analysis; D002681:China; D006812:Humic Substances / Q000032:analysis*; D060106:Lakes / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D006109:Poaceae / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D006812:Humic Substances; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen