摘要
为探究铜藻(Sargassum horneri)的有机碳释放速率、与净初级生产力(NPP)之间的关系及主要的调控因素等问题,本研究采用三变量三水平的正交实验,测定铜藻在不同温度(5、15和25℃)、光照[86、172和258μmol/(m^(2)·s)]和光照周期(L∶D=6 h∶18 h、L∶D=12 h∶12 h、L∶D=24 h∶0 h,L表示光照时长,D表示黑暗时长)条件下溶解有机碳(DOC)、颗粒有机碳(POC)的释放速率和初级生产力。结果显示,DOC和POC释放速率的范围分别为0.653~4.785 mg/(g·h)和0.066~0.322 mg/(g·h);温度和光照强度分别是铜藻释放DOC和POC的主要调控因素;铜藻在高温、中光、L∶D=6 h∶18 h条件下的DOC释放速率最高[4.785 mg/(g·h)],在高温、高光、L∶D=24 h∶0 h条件下的POC释放速率最高[0.322 mg/(g·h)];铜藻释放的DOC和POC占NPP的比值分别为4%~130%和0.4%~5.9%;DOC释放速率与NPP之间存在负相关关系,POC释放速率与NPP之间无明显相关性。研究结果为深入了解铜藻的生理生态学特性及其对沿海生态系统碳循环的影响提供了科技支撑。
The ocean is the largest carbon pool on earth and plays an important role in the global carbon cycle.Marine organisms contribute over half of the global carbon fixed by photosynthesis every year.Therefore,much attention has been paid to the role of the ocean in the carbon cycle and carbon sequestration.Macroalgae are an important component of coastal ecosystems,with strong and highly efficient carbon fixation capacity.The net primary productivity(NPP)of macroalgae was higher than that of phytoplankton and other primary producers in coastal waters.Parts of the photosynthates are released into the sea in the form of dissolved organic carbon(DOC)and particulate organic carbon(POC)during algae growth.Dissolved organic carbon and POC have attracted widespread attention because they can play important roles in carbon cycling and carbon sequestration in coastal ecosystems.However,the organic carbon release rate of macroalgae,its relationship with primary productivity,and the regulatory factors require further study.The growth of algae and the organic carbon release are influenced by temperature,light intensity,photoperiod,and other factors.However,organic carbon release rates among algae species might be quite different.Therefore,studying the regulatory effects of different factors on organic carbon release by algae and organic carbon release rate distribution has important implications for quantitatively evaluating the organic carbon release ability of algae and its contribution to the coastal ecosystem carbon cycle.In recent years,Sargassum horneri is the most common wild macroalgae in the Yellow Sea.Its ecological role in the coastal ecosystem has attracted widespread attention.Few studies have focused on organic carbon release by S.horneri.This study conducted an orthogonal experiment to measure DOC and POC release rates of S.horneri at different temperatures(5,15,and 25℃),light intensity[86,172,and 258μmol/(m^(2)·s)]and photoperiod(L:D=6 h:18 h,L:D=12 h:12 h,L:D=24 h:0 h,L means light time,D means dark time)to
作者
孙威
吴文广
刘毅
仲毅
王新萌
张继红
SUN Wei;WU Wenguang;LIU Yi;ZHONG Yi;WANG Xinmeng;ZHANG Jihong(School of Fisheries and Life Sciences,Shanghai Ocean University,Shanghai 201306,China;Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Laboratory of Marine Fisheries and Sustainable Development,Ministry of Agriculture and Rural Affairs,Qingdao 266071,China)
出处
《渔业科学进展》
CSCD
北大核心
2024年第3期46-54,共9页
Progress in Fishery Sciences
基金
科学技术部重点研发计划(2020YFA0607603)
国家自然科学基金委员会–山东省人民政府联合基金(U1906216)
山东省自然科学基金(ZR2022QD035)
中国水产科学研究院黄海水产研究所基本科研业务费专项(20603022022012,20603022022024)共同资助。
关键词
铜藻
净初级生产力
溶解有机碳
颗粒有机碳
Sargassum horneri
Net primary productivity
Dissolved organic carbon
Particulate organic carbon
