陆海交互区较高的固碳效率和较强的固碳潜力是基于自然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、汇的认识，于2021 年11~12 月采集钻孔岩芯间隙水，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）都呈现第二次海侵 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芯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。

Abstract： The 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 peaking” and “carbon neutrality”. In order 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 to enrich the understanding of carbon sources and sinks in the land-sea interaction region, the interstitial water from drill core was collected from November to December 2021 and analyzed for 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) are both characterized by large and high concentrations after the second transgression. The difference in dissolved organic matter composition and properties of terrestrial-phase interstitial water is greater than that of marine-phase interstitial water. Of the five fluorescence components identified by parallel factor analysis and matched by OpenFlour, the humus-like components contributed 77% of the total fluorescence intensity, except for the bottom stratum. The fluorescence index and biogenic index show that the core interstitial water chromophoric dissolved organic matter is dominated by the contribution of microbial reproduction activities, and the longer the burial, the more significant the microbial contribution, and there is no significant difference between the terrestrial and marine phases. The results of principal component analysis show that the compositions have some differences in different sedimentary stages, but the composition and properties of the interstitial water dissolved organic matter gradually converge as the sedimentary process occurs. The humus is highly matured in long time scales.