黄、渤海沉积物耗氧速率的时空分布特征和环境影响因素  

Characteristics of spatial and temporal distribution of sediment oxygen consumption rate and environmental influence factors in the Yellow Sea and Bohai Sea

作　　者：朱若思 宋国栋[1,2] 刘素美 Zhu Ruosi;Song Guodong;Liu Sumei(Frontiers Science Center of 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;Laboratory for Marine Ecology and Environmental Science,Qingdao Marine Science and Technology Center,Qingdao 266237,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,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]青岛海洋科技中心海洋生态与环境科学功能实验室,山东青岛266237 [3]中国海洋大学化学化工学院,山东青岛266100

出　　处：《海洋学报》2024年第5期16-26,共11页

基　　金：国家自然科学基金项目(42076035,42376044,U1806211);泰山学者项目。

摘　　要：沉积物耗氧(SOC)是海洋沉积物重要参数,是海底沉积物有机质矿化速率的重要表征参数,开展沉积物耗氧的研究有助于了解整个海洋的碳循环过程。陆架边缘海作为有机质矿化和埋藏最重要和最活跃的场所之一,在全世界已经受到广泛关注与研究,但是对于具有海洋环境典型季节变化的中国边缘海区域,尤其是黄、渤海仍然缺乏相应的关注。本文使用整柱培养法,分别于2022年4月、7月和10月对黄、渤海沉积物耗氧进行研究,结果表明黄、渤海沉积物耗氧速率为7.11~17.33 mmol/(m^(2)·d)。黄海春季沉积物耗氧速率与渤海无显著差异(ANOVA,p> 0.05),夏季(ANOVA,p <0.01)和秋季(ANOVA,p <0.01)黄海沉积物耗氧速率低于渤海;黄海春季沉积物耗氧速率最高,秋季次之,夏季最小,渤海夏季和秋季接近,显著高于春季(ANOVA,p <0.05),温度和沉积物Chl a浓度是主要影响因素。同时,用沉积物耗氧速率来评估海底有机质矿化速率,并与初级生产力相比较,结果表明渤海海底有机质矿化与初级生产力的占比范围为42.8%~74.5%,是渤海碳循环的关键环节之一,黄海海底沉积物有机质矿化在黄海碳循环中作用不如渤海显著。本文系统研究了黄、渤海沉积物耗氧速率及其时空分布特征,探究了黄、渤海地区有机质矿化对初级生产力的贡献,为理解黄、渤海区域有机质矿化和埋藏提供理论支持。Sediment oxygen consumption(SOC) is an important parameter of marine sediments and an important characterization parameter of the rate of organic carbon mineralization in seafloor sediments,and the study of SOC can help us to understand the carbon cycling process in the whole ocean.As one of the most important and active sites for organic carbon mineralization and burial,marginal seas have received widespread attention and research around the world,but there is still a lack of relevant attention to the Chinese marginal sea region with typical seasonal variations of the marine environment,especially the Yellow Sea and Bohai Sea.In this paper,the intact core incubation was used to study the SOC in the Yellow Sea and Bohai Sea in April,July and October 2022,and the results showed that the rates of SOC ranged from 7.11 mmol/(m^(2)·d) to 17.33 mmol/(m^(2)·d).There was no significant difference between the SOC of the Yellow Sea and the Bohai Sea in spring(ANOVA,p > 0.05),and the SOC of the Yellow Sea was lower than Bohai Sea in summer(ANOVA,p < 0.01) and autumn(ANOVA,p < 0.01);the SOC of the Yellow Sea was the largest in spring and the smallest in summer,and there was no significant difference between the SOC of the Bohai Sea in summer and autumn,which were significantly higher than that of spring(ANOVA,p < 0.05).Temperature and sediment Chl a concentration were the influencing factors.Meanwhile,the SOC was used to assess the rate of benthic organic carbon mineralization.When compared with the primary productivity,the results indicated that the contribution of benthic organic carbon mineralization to primary productivity in the Bohai Sea ranged from 42.8% to 74.5%,which was one of the key links in the carbon cycle of the Bohai Sea,while the benthic organic carbon mineralization in Yellow Sea plays a less significant role in the carbon cycle of the Yellow Sea carbon cycle than Bohai Sea.This paper systematically studied the SOC in the Yellow Sea and Bohai Sea and its spatial and temporal distribution characteristics,e

关 键 词：沉积物耗氧 有机质矿化 温度 沉积物Chla 黄、渤海 

分 类 号：P736.21[天文地球—海洋地质]