首页  |  本刊简介  |  编委会  |  投稿须知  |  订阅与联系  |  微信  |  出版道德声明  |  Ei收录本刊数据  |  封面
基于三维荧光及平行因子分析的川西高原河流水体CDOM特征
摘要点击 3842  全文点击 1164  投稿时间:2017-08-24  修订日期:2017-10-20
查看HTML全文 查看全文  查看/发表评论  下载PDF阅读器
中文关键词  三维荧光及平行因子法(EEM-PARAFAC)  有色溶解性有机质  天然水体  川西高原河流
英文关键词  EEM-PARAFAC  chromophoric dissolved organic matter (CDOM)  natural waters  rivers in the western Sichuan plateau
作者单位E-mail
刘堰杨 四川大学环境科学与工程系, 四川省土壤环境保护工程技术中心, 成都 610065 vivianalau@qq.com 
秦纪洪 成都大学环境系, 成都 610106  
刘琛 中国科学院水利部成都山地灾害与环境研究所, 成都 610041  
孙辉 四川大学环境科学与工程系, 四川省土壤环境保护工程技术中心, 成都 610065 sunhuifiles@gmail.com 
唐翔宇 中国科学院水利部成都山地灾害与环境研究所, 成都 610041  
范诗雨 四川大学环境科学与工程系, 四川省土壤环境保护工程技术中心, 成都 610065  
中文摘要
      川西高原草甸和高寒湿地是青藏高原重要土壤碳库之一,高原河流水体溶解性有机碳特征及其与土壤碳库关系研究,对于理解高寒区域土壤碳输出通量及强度具有重要意义.本文对川西高原高山峡谷区河流(岷江上游、杂谷脑河、抚边河)和高原夷平面河流(白河)水体有色溶解性有机质(CDOM)采用三维荧光及平行因子法(EEM-PARAFAC)进行了分析.结果表明:①高原河流中CDOM主要有3种组分,即C1(260/480,UVC类腐殖质)、C2[310/420(570),UVA类腐殖质]和C3(280/370,类色氨酸);②河流沿程变化特征显示,高山峡谷区河流总荧光强度值较低,变化范围窄,高原夷平面河流(白河)与其相反;同时白河类腐殖质(C1、C2)荧光强度远高于其他3条河流,表明白河中源于沿岸草甸和湿地的陆源腐殖质高,而其余高山峡谷区3条河流陆源腐殖质输入相对低;③水体荧光特征参数(荧光指数FI、自生源指数BIX、腐殖化系数HIXb、新鲜度指数βα)表明,高山峡谷区河流CDOM来源具有外源兼内源双重特征,腐殖化程度低;高原夷平面河流CDOM腐殖化程度相对较高且降解程度低;④相关性分析发现4条河流中C1、C2极显著正相关,且白河C1、C2、C3呈极显著正相关;所有河流βα与BIX呈极显著正相关,溶解性有机碳(DOC)与355 nm处吸收系数[a(355)]相关性不显著.
英文摘要
      Alpine meadows and wetlands of western Sichuan plateau are essential organic carbon pools for Tibetan plateau; thus, a thorough understanding of the characteristics of dissolved organic carbon (DOC) and its association with soil carbon storage pool helps to reveal the flux and intensity of DOC export in the area. Surface water samples were collected from three rivers (the upper reaches of Min River, Zagunao River, and Fubian River) in the alpine-gorge region and Bai River in the plateau planation surface distributed among the watersheds in western Sichuan plateau, Southwest China. UV absorbance and EEM fluorescence spectroscopy with parallel factor analysis (PARAFAC) was used to characterize chromophoric dissolved organic matter (CDOM). PARAFAC produced a three-component model:C1(260/480) and C2(310/420) represented terrestrial humic-like fluorophores, and C3(280/370) belonged to tyrosine-like substances. The total fluorescence intensity of CDOM in the alpine-gorge region showed fewer changes along the rivers and was lower than that of the Bai River in the hilly plateau. The Bai River had much higher concentrations of humic-like substances (C1,C2) compared to the other three rivers, indicating its terrestrial sources with high humification degree originated from meadows and watersheds along the river. The calculated fluorescence indices (FI, BIX, HIX, β:α) showed that CDOM in the alpine-gorge region was a mixture with both autochthonous and allochthonous origins with low humification degree, while CDOM in the plateau planation surface had a higher degree of humification and lower extent of degradation. Statistical analysis showed that the C1 and C2 components in four rivers were significantly positively correlated, and C1, C2 and C3 components in Bai River were significantly positively correlated. β:α and BIX were significantly positively correlated in four rivers, but there was no significant correlation between DOC and CDOM[a(355)].

您是第51721049位访客
主办单位:中国科学院生态环境研究中心 单位地址:北京市海淀区双清路18号
电话:010-62941102 邮编:100085 E-mail: hjkx@rcees.ac.cn
本系统由北京勤云科技发展有限公司设计  京ICP备05002858号-2