汾河太原段有色可溶性有机物吸收特性及来源分析  

Absorption Characteristics and Source Analysis of Chromophoric Dissolved Organic Matter in the Taiyuan Section of Fenhe River

作　　者：高峰[1] 陈晓玲[2] 杨文府 姚月 汪雯雯 GAO Feng;CHEN Xiaoling;YANG Wenfu;YAO Yue;WANG Wenwen(School of Resources and Environment,Shanxi University of Finance and Economics,Taiyuan 030006,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing/Wuhan University,Wuhan 430079,China;School of Land Science and Technology,China University of Geosciences,Beijing 10083,China;Shanxi Key Laboratory of Resources,Environment and Disaster Monitoring/Shanxi Coal Geology Geophysical Surveying Exploration Institute,Jinzhong 030600,China;Key Laboratory of Digital Earth Science,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]山西财经大学资源环境学院,山西太原030006 [2]武汉大学/测绘遥感信息工程国家重点实验室,湖北武汉430079 [3]中国地质大学土地科学技术学院,北京100083 [4]山西省煤炭地质物探测绘院/资源环境与灾害监测山西省重点实验室,山西晋中030600 [5]中国科学院数字地球重点实验室,北京100094

出　　处：《生态环境学报》2021年第3期569-577,共9页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(41971402);武汉大学测绘遥感信息工程国家重点实验室开放研究基金项目(19R04);资源环境与灾害监测山西省重点实验室开放基金项目(2019-05);山西省应用基础研究计划项目(201901D211407);山西省高等学校科技创新项目(2019L0485)。

摘　　要：加强城市河流水体有色可溶性有机物吸收特性及来源方面的研究,对认识和理解人类活动影响下河流有机污染物的行为特征具有重要意义。以汾河太原段为研究对象,探讨了CDOM吸收系数与总悬浮物(TSM)、有机悬浮物(OSM)、无机悬浮物(ISM)、叶绿素(Chla)、总氮(TN)和总磷(TP)等水质指标之间的关系,同时对CDOM的特征指标M值和指数函数曲线斜率S值进行研究。结果表明,(1)不同采样点CDOM吸收系数差异明显,a(440)的变化范围为0.40-1.20m^(-1),且越到短波处差异越显著。(2)CDOM吸收与水体营养盐状况相关,CDOM吸收系数与水体TP和TN存在显著正相关;CDOM吸收与水体颗粒物浓度相关,CDOM吸收系数与TSM、ISM和OSM呈显著正相关;但CDOM吸收与Chla不存在显著相关性。(3)汾河太原段夏季水体CDOM主要来源于陆源性有机污染物质的输入,浮游植物新陈代谢及腐烂降解对CDOM的贡献很小。(4)a(440)与M值呈显著负相关,M值与S值呈显著正相关,表明汾河太原段水体腐殖酸的相对含量高于富里酸,相对分子质量较大。(5)增加背景项的指数函数拟合模型精度优于常规指数函数模型,且拟合得到的S值较大,这对分析CDOM的组成和来源具有重要影响。该文对城市河流水体CDOM固有光学特性、组成和来源方面的研究可以提供重要参考,同时也可为城市水体CDOM的遥感估算提供理论依据和数据支撑。Strengthening research on the absorption characteristics and sources of chromophoric dissolved organic matter in urban river water is of great significance for understanding the behavioral characteristics of organic pollutants under the influence of human activities.This study takes the Taiyuan section of Fenhe river as the research object.The relationship between CDOM absorption coefficient and total suspended matter(TSM),organic suspended matter(OSM),inorganic suspended matter(ISM),chlorophyll(Chla),total nitrogen(TN)and total phosphorus(TP)are calculated and analyzed.In addition,M values and spectral slope S of CDOM are also discussed.The results show that:(1)The CDOM coefficient differed obviously in different sites;the change range of a(440)is 0.40-1.20 m^(-1);the shorter the wavelength,the more obvious the difference;(2)CDOM absorption is related to the nutrient and particulates level;There is a significant positive linear correlation between a(440)and TN,TP,TSM,ISM and OSM;However,there is no significant linear correlation between a(440)and Chla;(3)CDOM in the Taiyuan section of Fenhe river in summer is mainly come from the input of terrestrial organic pollutants;Phytoplankton metabolism and degradation contribute little to CDOM;(4)M values present a significant negative correlation with a(440)and a significant positive correlation with spectral slope S,which indicated that the relative content of humic acid is higher than that of fulvic acid,and the relative molecular mass is larger;And(5)the accuracy of the exponential function fitting model with the added background item is better than that of the conventional exponential function model,and S value is larger,which has an important influence on the analysis of the composition and source of CDOM.This paper can provide an important reference for the research on the inherent optical properties,composition and source of CDOM in urban river water,and it can also provide theoretical basis and data support for remote sensing estimation of CDOM.

关 键 词：汾河太原段 有色可溶性有机物 吸收特性 城市河流 来源分析 光谱斜率 

分 类 号：X524[环境科学与工程—环境工程]