贵州龙架山国家森林公园水桥河水体DOM荧光特征及来源分析  

Characterization and source analysis of DOM fluorescence in the water of Shuiqiao River in Longjiashan National Forest Park,Guizhou Province,China

作　　者：苟雪 肖瑾 黎光娅 陈瑞芳 GOU Xue;XIAO Jin;LI Guang-ya;CHEN Rui-fang(State-owned Longli Forestry Farm,Longli 551200,China;Chengdu Nature Museum(Chengdu Polytechnic University Museum),Chengdu 610059,China)

机构地区：[1]贵州省国有龙里林场,贵州龙里551200 [2]成都自然博物馆(成都理工大博物馆),四川成都610059

出　　处：《环境生态学》2024年第6期23-30,共8页Environmental Ecology

基　　金：贵州省龙架山国家森林公园科研项目[黔财预(2024)1号]资助。

摘　　要：为探究贵州龙架山国家森林公园流域水体中溶解性有机物的组成、来源和影响因素,本研究于2023年夏季在水桥河流域采集了16个水样,应用紫外和荧光光谱技术研究了水桥河水中DOM的分子组成和来源,并结合主成分分析和多元线性回归分析方法定量评估了DOM各组分的相对贡献。结果表明:水桥河干流水质整体情况较好,流域内DOM主要由类腐殖质物质、类富里酸和类蛋白物质构成。荧光组分主要受内源控制(FI>1.9,HIX<4.0),上游支流水体中外源作用更强,但长坝河水质受人类活动影响相对较多。河水中DOM的自生源作用和腐殖化程度从上游到下游呈现逐渐增强趋势。水质较差的水体中DOM的总荧光强度和腐殖化程度较高。主成分分析结果显示,流域内内源输入对DOM贡献率为58%,人类活动对DOM贡献率为25%。河水中类富里酸和类蛋白物质主要来源于长坝河周边污水的输入。To investigate the sources of dissolved organic matters in the watershed of Longjiashan National Forest Park from human activities,this study applied ultraviolet and fluorescence spectroscopic techniques to investigate the molecular composition and sources of dissolved organic matter(DOM)in the water of Shuiqiao River.Meanwhile,the relative contribution of DOM was also quantitatively assessed by combining principal component analysis(PCA)and multiple linear regression analysis methods.The results showed that the overall water quality of the main stream in the Shuiqiao River was good.The DOM in the river was mainly composed of humus-like,fulvic acid-like and protein-like substances.The fluorescence component is mainly controlled by internal sources(FI>1.9,HIX<4.0),with a stronger external role in the upper tributary waters.However,the water quality of the Changba River is relatively more affected by human activities.The autochthonous source and humification of DOM in the river showed a gradual increasing trend from upstream to downstream.The total fluorescence intensity and humification degree of DOM were higher in the water with poorer water quality.The PCA results showed that internal inputs to the watershed contributed 58%to DOM,and the human activities contributed 25%to DOM.The fulvic acid-like and protein-like compounds in the study area mainly originated from the input of sewage around the Changba River.

关 键 词：溶解性有机质 紫外光谱 荧光光谱 主成分分析 水桥河 

分 类 号：X52[环境科学与工程—环境工程]