珠江流域东江至虎门出口的河流有机碳来源与输运特征（英文）

编号 zgly0001584927

文献类型 期刊论文

文献题名 珠江流域东江至虎门出口的河流有机碳来源与输运特征（英文）

作者 付迎春  唐丛国  李军  赵耀龙  钟巍  曾献铁 

作者单位 SchoolofGeography  SouthChinaNormalUniversity  StateKeyLaboratoryofEnvironmentalGeochemistry  InstituteofGeochemistry  CAS  TianjinKeyLaboratoryofWaterResourcesandEnvironment  TianjinNormalUniversity 

母体文献 Journal of Geographical Sciences 

年卷期 2014年01期

年份 2014 

分类号 P342 

关键词 DongjiangRiver  Humenoutlet  totalorganiccarbon  flux  δ13C  C/N 

文摘内容 Transport of organic carbon via rivers to estuary is a significant geochemical process in the global carbon cycle.This paper presents bulk total organic carbon(TOC) from the Dongjiang catchment to the adjacent Humen outlet,and discusses the applicability of δ13C and ratio of carbon to nitrogen(C/N) as indicators for sources of organic matter in the surface sediments.Survey results showed that organic carbon concentration in summer were higher than in the winter.An elevated trend of TOC occurred along the river to the Humen outlet in both surveys,and the highest mean values of dissolved and particular organic carbon(DOC~279 μmol L–1 and POC~163 μmol L–1) were observed in the urban deltaic region in summer flood flow.Winter samples had a wide range of δ13C and C/N(δ13C –24.6‰ to –30.0‰,C/N 4–13),and summer ones varied slightly(δ13C –24.2‰ to –27.6‰,C/N 6–18).As results suggest that POC in the three zones of upstream-delta-outlet dominantly came from riverbank soil,phytoplankton and agricultural C3 plants in winter,whereas main sources were from the riverbank and mangrove soil in summer.Moreover,anthropogenic sewage inputs had 11% and 7% contribution to POC in the deltaic and outlet.Transport accompanied with seasonal freshwater variation,phytoplankton production and degradation,and removal behavior caused variation of organic carbon concentration.The results also discovered that TOC export bulk in Dongjiang was approximately one quarter of Humen flux in the dry flow,and anthropogenic activity significantly impacted the river export contribution.