莱州湾南岸陆海交互地层间隙水有色溶解有机物的光谱特征研究  

Spectral Characterization of Chromophoric Dissolved Organic Matter in the Interstitial Water of Land-sea Interaction Strata Along the South Coast of Laizhou Bay

作　　者：祝唐刘 刘智丹 邹立[1] 钟希煌 奚嘉鸿 江雪艳[2] ZHU Tangliu;LIU Zhidan;ZOU Li;ZHONG Xihuang;XI Jiahong;JIANG Xueyan(Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Key Laboratory of Marine Chemistry Theory and Engineering Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学,海洋环境与生态教育部重点实验室,山东青岛266100 [2]中国海洋大学,海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《地球科学进展》2024年第6期647-658,共12页Advances in Earth Science

基　　金：国家重点研发计划项目(编号:2022YFC2803803);国家自然科学基金项目(编号:41876077)资助。

摘　　要：陆海交互区较高的固碳效率和较大的固碳潜力是在自然条件下长期解决气候变化和实现“碳达峰”“碳中和”的重要方案。为揭示莱州湾南岸陆海交互层中溶解有机物的来源和赋存形式,丰富对陆海交互区的碳源和碳汇的认识,于2021年11~12月采集钻孔岩心间隙水,分析其有色溶解有机物的紫外可见吸收光谱和三维荧光光谱。分析结果表明,溶解有机碳与a(320)均呈现出第二次海侵后变化大、浓度高的特征,陆相间隙水溶解有机物组成和性质差别大于海相间隙水。经平行因子分析法鉴别和OpenFlour匹配的5种荧光组分中,除底层外,类腐殖质组分贡献为总荧光强度的77%。荧光指数和自生源指数表明岩心间隙水有色溶解有机物由微生物再生产活动贡献为主,埋藏越久,微生物贡献越为显著,陆相层和海相层没有明显差别。主成分分析结果表明,不同沉积阶段溶解有机物组成存在一定差别,但随着沉积过程的发生,间隙水溶解有机物组成和性质逐渐趋同。长时间尺度下腐殖质高度成熟。High sequestration efficiency and strong sequestration potential of land-sea interaction regions are important nature-based long-term solutions to climate change and the achievement of“carbon peak”and“carbon neutrality”.To reveal the sources and forms of Dissolved Organic Matter(DOM)in the land-sea interaction stratigraphy along the south coast of Laizhou Bay and enrich the understanding of carbon sources and sinks in the land-sea interaction region,interstitial water from a drill core was collected from November to December 2021 and analyzed for ultraviolet(UV-)visible absorption spectra and three-dimensional fluorescence spectral signatures of Chromophoric Dissolved Organic Matter(CDOM).The analyses showed that dissolved organic carbon and a(320)were both characterized by large and high concentrations after the second transgression.The differences in the DOM composition and properties of terrestrial-phase interstitial water were greater than those of marine-phase interstitial water.Excluding the bottom stratum,of the five fluorescence components identified by parallel factor analysis and matched using OpenFlour,humus-like components contributed 77%of the total fluorescence intensity.The fluorescence and biogenic indices showed that the core interstitial water chromophoric dissolved organic matter was dominated by the contribution of microbial reproduction activities;the longer the burial was,the more significant the microbial contribution,and there was no significant difference between the terrestrial and marine phases.The results of principal component analysis show that the compositions exhibit several differences in different sedimentary stages,but the composition and properties of the interstitial water DOM gradually converge as the sedimentary process occurs.Humus matures over long timescales.

关 键 词：莱州湾南岸 陆海交互地层 间隙水 有色溶解有机物 

分 类 号：P734[天文地球—海洋化学] X142[天文地球—海洋科学]