黄、东海秋季群落净生产力的分布特征及其影响因素  

High-Resolution Distribution and Regulating Factors of Net Community Production in the East China Sea and Yellow Sea in Autumn

作　　者：韩宗奕 秦川[1,2] 郑文静 张桂玲 简慧敏[1,2] Han Zongyi;Qin Chuan;Zheng Wenjing;Zhang Guiling;Jian Huimin(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;Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,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]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2023年第12期85-94,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41776122,42176044);国家自然科学基金联合基金项目(U1806211)资助。

摘　　要：群落净生产力(Net Community Production,NCP)代表了总初级生产力与群落呼吸的差值,是衡量生物活动对上层海洋碳循环影响的重要指标。O_(2)/Ar比值消除了物理过程对海水中溶解氧(O_(2))饱和度的影响,因此基于生物氧饱和度(ΔO_(2)/Ar)可以估算海洋混合层群落净生产力。本研究于2015年10月,首次利用膜进样质谱法走航获取了黄东海表层海水中高分辨率O_(2)/Ar数据,并估算了其NCP,探讨了其分布特征及影响因素。本航次观测到的Δ(O_(2)/Ar)范围为-30.21%~44.38%,平均值为(0.32±8.29)%,低值主要出现在长江口北侧,而长江口(11.75±13.75)%和浙闽沿岸(5.42±5.21)%的Δ(O_(2)/Ar)明显高于南黄海(-2.62±5.96)%和东海陆架区(-0.79±5.02)%。南黄海和东海陆架区平均NCP为(-9.24±23.15)和(-4.04±18.68)mmol·m^(-2)·d^(-1),总体表现为异养状态,而长江口和浙闽近岸NCP均值分别为(24.49±35.74)和(10.85±12.17)mmol·m^(-2)·d^(-1)。东、黄海NCP的空间分布格局主要受到陆源输入和水团混合的影响,营养盐和光照也是秋季影响NCP分布的重要因素。本研究有助于深入认识高度动态的东、黄海碳循环过程及控制机制。Net Community Production(NCP)represents the difference between gross primary productivity and community respiration,indicating the impact of biological activity on the carbon cycle in the upper ocean.The biological oxygen(O_(2))saturation(ΔO_(2)/Ar)is used to estimate NCP in marine surface waters,with O_(2)/Ar ratio used to correct for physical effects on O_(2) supersaturation.In order to obtain high-resolution distribution of NCP and improve our understanding of its regulating factors in the East China Sea(ECS)and the Yellow Sea,we conducted continuous shipboard measurements of dissolved O_(2) and Ar using membrane inlet mass spectrometry(MIMS)in October 2015.The observedΔ(O_(2)/Ar)ranged from-30.21%to 44.38%,with the mean value of(0.32±8.29)%.Among them,the lowest values were found in the region north of the Yangtze River estuary,whileΔ(O_(2)/Ar)was significantly higher in the Yangtze River estuary(11.75±13.75)%and off the Min-Zhe coast(5.42±5.21)%than in the South Yellow Sea(-2.62±5.96)%and East China Sea shelf(-0.79±5.02)%.The mean NCP was(-9.24±23.15)and(-4.04±18.68)mmol·m^(-2)·d^(-1) in the South Yellow Sea and the ECS shelf,indicating net heterotrophy,while NCP was(24.49±35.74)and(10.85±12.17)mmol·m^(-2)·d^(-1) in the Yangtze estuary and the Min-Zhe coast,respectively.The distribution of NCP in the YS and ECS showed obvious spatial heterogeneity and was mainly influenced by land-source input and water mass mixing.Nutrient and light availability were the major environmental factors regulating the distribution of NCP.This study improves our understanding of the carbon cycle in the highly dynamic coastal area such as the ESC and Yellow Sea.

关 键 词：东海 黄海 群落净生产力 Δ(O 2/Ar) 陆源输入 碳循环 

分 类 号：P734[天文地球—海洋化学]