胶州湾有机碳来源、碳储量的沉积记录及环境响应  

Sedimentary records and environmental responses of organic carbon sources and carbon stock in the Jiaozhou Bay

作　　者：刘珂[1,2,3] 张海龙 朋鹏[1,2] 肖晓彤 LIU Ke;ZHANG Hailong;PENG Peng;XIAO Xiaotong(Frontiers Science Center for Deep Ocean Multispheres and Earth System,and Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Laoshan Laboratory,Qingdao 266237,China;National Marine Environmental Monitoring Center,Dalian 116023,China)

机构地区：[1]中国海洋大学深海圈层与地球系统前沿科学中心和海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]崂山实验室,山东青岛266237 [3]国家海洋环境监测中心,辽宁大连116023

出　　处：《海洋环境科学》2024年第5期776-786,共11页Marine Environmental Science

基　　金：崂山实验室“十四五”重大项目(2022QNLM040003-2);国家自然科学基金-山东省联合基金(U1706219);中央高校基本科研业务费专项(202242001);大连青年科技之星项目(2022RQ052)。

摘　　要：为探究近几十年来胶州湾沉积有机碳来源及埋藏对人类活动的响应,评估胶州湾碳储能力,本研究对胶州湾不同区域的3根沉积柱年代、矿物学参数和有机质参数进行测定,并进行有机碳储量估算。基于二端元模型计算获得JZB28、JZB20和JZB14柱陆源有机质平均贡献分别为39%±14%、37%±6%和17%±5%,靠近东部河口的JZB28柱陆源有机质贡献较高。20世纪80年代之前,高降水量和输砂量等因素导致较高的陆源有机质输入;到2000年前后,受降水量和输砂量减少以及高营养盐的废水输入增加导致海源有机质贡献增加;2000年以后,有机质组成逐渐趋于平稳。基于有机碳含量和干密度计算JZB28、JZB20和JZB14柱单位厘米平均有机碳储量分别为(0.78±0.09)t/ha、(0.50±0.07)t/ha和(0.45±0.06)t/ha,较高的有机碳储量表明胶州湾是重要的沉积碳库,该研究结果可为胶州湾海域碳储生态服务功能可持续发展提供科学依据。In order to explore the sources and burial of OC in the sediments of Jiaozhou Bay and to evaluate the carbon stock,three cores sediments were collected from different areas of Jiaozhou Bay.The radionuclide,mineralogical parameters and total organic carbon parameters were determined.Based on the binary end member model,the average contribution of terrestrial OC from cores JZB28,JZB20 and JZB14 is 39%±14%,37%±6%and 17%±5%,the highest terrestrial contribution in the core JZB28 was located near the eastern estuary of the bay.Before the 1980s,the higher contribution of terrestrial OC in Jiaozhou Bay was mainly influenced by sufficient precipitation and sediment transport;by the year 2000,the OC contribution from marine sources increased due to a combination of decreasing of precipitation and sediment transport,as well as increasing of high-nutrient wastewater input;after 2000,the OC composition was stable.The average carbon stock of the cores JZB28,JZB20 and JZB14 is(0.78±0.09)t/ha,(0.50±0.07)t/ha and(0.45±0.06)t/ha,respectively.Compared to bays and coastal seas,the relatively high carbon stock reveals that the Jiaozhou Bay is an important sedimentary carbon reservoir.The results based on this study could provide scientific basis for the sustainable development of the ecological service function of carbon storage in the Jiaozhou Bay.

关 键 词：胶州湾 有机碳 来源 碳储量 人类活动 

分 类 号：P736[天文地球—海洋地质] X142[天文地球—海洋科学]