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引用本文:耿悦,吕喜玺,于瑞宏,孙贺阳,刘心宇,曹正旭,李向伟,朱鹏航,葛铮.乌梁素海悬浮颗粒物和沉积物有机碳同位素特征及来源.湖泊科学,2021,33(6):1753-1765. DOI:10.18307/2021.0612
Geng Yue,Lv Xixi,Yu Ruihong,Sun Heyang,Liu Xinyu,Cao Zhengxu,Li Xiangwei,Zhu Penghang,Ge Zheng.Isotopic characteristics and sources of organic carbon in suspended particulates and sediments in Lake Wuliangsuhai. J. Lake Sci.2021,33(6):1753-1765. DOI:10.18307/2021.0612
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乌梁素海悬浮颗粒物和沉积物有机碳同位素特征及来源
耿悦1,2, 吕喜玺1,2, 于瑞宏1,2,3, 孙贺阳1,2, 刘心宇1,2, 曹正旭1,2, 李向伟1,2, 朱鹏航1,2, 葛铮1,2
1.内蒙古大学生态与环境学院, 呼和浩特 010021;2.内蒙古自治区河流与湖泊生态重点实验室, 呼和浩特 010021;3.蒙古高原生态学与资源利用教育部重点实验室, 呼和浩特 010021
摘要:
悬浮颗粒物和沉积物是湖泊有机污染物的主要承载物质,其稳定同位素研究对有效识别有机质污染导致的湖泊富营养化具有重要意义.本研究选取乌梁素海为研究区,于2019年4月(融冰期)、7月(夏灌期)和10月(秋灌期)对湖区及入湖渠道的表层沉积物和悬浮颗粒物中有机碳的δ13C、C/N比及总有机碳(TOC、POC)和总氮(TON、PON)含量进行测定分析,联合采用δ13C、C/N及同位素多元混合模型研究湖泊有机碳来源及其贡献率.结果表明,乌梁素海悬浮颗粒物有机碳δ13CPOC的变化范围为-23.29‰~-29.75‰,呈现10月>4月>7月、入湖渠道>湖区的趋势,悬浮颗粒物POC/PON比变化范围为4.10~21.35,呈现出4月<7月<10月的时间变化,悬浮颗粒有机质主要来源于浮游植物(51.59%)、入湖渠道泥沙(34.60%)和大型水生植物(13.76%).沉积物有机碳δ13CTOC变化范围为-27.58‰~-22.68‰,呈现4月<10月<7月的变化,沉积物TOC/TON比变化范围为3.06~23.77,时空变化明显,沉积物有机质则主要源于入湖渠道挟带的泥沙,贡献达72.79%以上,而浮游植物与大型水生植物的贡献率相差较小,分别为11.85%和15.36%.本研究可以初步判定受入湖渠道影响的富营养化湖泊中悬浮颗粒物和沉积物有机碳来源,为改善湖泊有机污染和研究有机碳来源提供更多理解.
关键词:  悬浮颗粒物  沉积物  有机碳  稳定同位素  乌梁素海
DOI:10.18307/2021.0612
分类号:
基金项目:国家自然科学基金项目(51869014)、内蒙古自治区科技计划项目(2019GG019)、内蒙古自治区重大专项(ZDZX2018054,2020ZD0009)、国家重点研发计划项目(2016YFC0500508)和内蒙古高原生态与资源利用教育部重点实验室开放课题(KF2020006)联合资助.
Isotopic characteristics and sources of organic carbon in suspended particulates and sediments in Lake Wuliangsuhai
Geng Yue1,2, Lv Xixi1,2, Yu Ruihong1,2,3, Sun Heyang1,2, Liu Xinyu1,2, Cao Zhengxu1,2, Li Xiangwei1,2, Zhu Penghang1,2, Ge Zheng1,2
1.College of Ecology and Environment, Inner Mongolia University, Hohhot 010021, P. R. China;2.Inner Mongolia Key Laboratory of River and Lake Ecology, Hohhot 010021, P. R. China;3.Mongolian Plateau Key Laboratory of Ecology and Resource Utilization, Ministry of Education, Hohhot 010021, P. R. China
Abstract:
Suspended particulates and sediments are the main substances of lake organic pollutants and organic carbon, and their stable isotope research is of great significance for effectively identifying lake eutrophication. We select Lake Wuliangsuhai as our research site to measure and analyze the index, such as δ13C, C/N, total organic carbon (TOC, POC) and total nitrogen (TON, PON) content of organic matter in surface sediments and suspended particulates of the lake area and the inflow canal in April (melting period), July (summer irrigation period) and October (autumn irrigation period) in 2019. We used δ13C and C/N in combination with isotope multivariate mixed model to investigate the sources and contributions of the lake organic carbon. The results indicate that the variations of δ13CPOC in the suspended particulates organic carbon range from -23.29‰ to -29.75‰, with a trend of October>April>July and inflow canal>lake area. POC/PON ratio of the suspended particulates changes from 4.10 to 21.35, with a trend of October>July>April. The suspended particulate organic matter mainly comes from phytoplankton (51.59%), silt of the inflow canal (34.60%) and macrophyte (13.76%). The δ13CTOC value of the bottom sediment organic carbon varies from -27.58‰ to -22.68‰, with a tendency of April72.79%), while the contribution rate of phytoplankton and macrophyte is relatively low (11.85% and 15.36%, respectively). This study estimates the sources of organic carbon in the suspended particulates and bottom sediments in a eutrophic lake affected by the inflow canal, and provides an in-depth understanding for improving the lake pollution and studying organic carbon sources.
Key words:  Suspended particulates  sediments  organic carbon  stable isotope  Lake Wuliangsuhai
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