Distribution Characteristics and Sources of Sedimentary Organic Matter in the Pearl River Estuary and Adjacent Coastal Waters,Southern China  

作　　者：张凌 殷克东 杨永强 张德荣 

机构地区：[1]State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology,Chinese Academy of Sciences [2]School of Marine Sciences, Sun Yat-Sen University [3]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences

出　　处：《Journal of Earth Science》2013年第2期262-273,共12页地球科学学刊（英文版）

基　　金：supported by the National Key Basic Research Program of China(973 Program)(No.2012CB956004);the National Natural Science Foundation of China(No.40903047)

摘　　要：Geochemical descriptors （carbon, nitrogen contents, and their isotopes） of sedimentary organic matter （OM） were investigated in the Pearl River estuary （PRE） and adjacent coastal waters.The comprehensive geochemical data of surface and deep sediments were provided, and the sources of sedimentary OM were discussed in this area mainly impacted by human activities. Surface （1-10 cm）and deep （190-200 cm） sedimentary total organic carbon （TOC） were 1.2% and 0.6%, and total nitrogen （TN） contents were 0.09% and 0.05%, with δ^13C of-24.3%0 and -24.5%0, on the average, respectively.Higher TOC and TN contents combining with relatively negative 613C values in surface sediments suggested the increasing OM inputs from rivers in recent years. Terrestrial organic carbon （OC） contents were 0.70% and 0.36%, and marine OC contents were 0.50% and 0.28% on the average, respectively, in surface and deep sediment. Surface terrestrial and marine OC were lower in river outfalls due to the high current energy, and deep terrestrial and marine OC showed the increasing trend away from the coast. Lower δ^15 was mainly attributed to the influence of river sewage discharge in this study.Geochemical descriptors （carbon, nitrogen contents, and their isotopes） of sedimentary organic matter （OM） were investigated in the Pearl River estuary （PRE） and adjacent coastal waters.The comprehensive geochemical data of surface and deep sediments were provided, and the sources of sedimentary OM were discussed in this area mainly impacted by human activities. Surface （1-10 cm）and deep （190-200 cm） sedimentary total organic carbon （TOC） were 1.2% and 0.6%, and total nitrogen （TN） contents were 0.09% and 0.05%, with δ^13C of-24.3%0 and -24.5%0, on the average, respectively.Higher TOC and TN contents combining with relatively negative 613C values in surface sediments suggested the increasing OM inputs from rivers in recent years. Terrestrial organic carbon （OC） contents were 0.70% and 0.36%, and marine OC contents were 0.50% and 0.28% on the average, respectively, in surface and deep sediment. Surface terrestrial and marine OC were lower in river outfalls due to the high current energy, and deep terrestrial and marine OC showed the increasing trend away from the coast. Lower δ^15 was mainly attributed to the influence of river sewage discharge in this study.

关 键 词：organic matter concentration ISOTOPE Pearl River estuary 

分 类 号：P736.21[天文地球—海洋地质]