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引用本文:汪旋,李致春,李翔,许晓光,张思远,王慧敏,厉荣强,王国祥.蓝藻水华衰亡对沉积物碳库有机碳组分的影响.湖泊科学,2020,32(2):346-356. DOI:10.18307/2020.0212
WANG Xuan,LI Zhichun,LI Xiang,XU Xiaoguang,ZHANG Siyuan,WANG Huimin,LI Rongqiang,WANG Guoxiang.Effect of the decline of cyanobacterial bloom on the organic carbon composition of lake sediment carbon pool. J. Lake Sci.2020,32(2):346-356. DOI:10.18307/2020.0212
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蓝藻水华衰亡对沉积物碳库有机碳组分的影响
汪旋1,2, 李致春1,2,3, 李翔1,2, 许晓光1,2, 张思远1,2, 王慧敏1, 厉荣强1, 王国祥1,2
1.南京师范大学环境学院, 南京 210023;2.江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023;3.宿州学院环境与测绘工程学院, 宿州 234000
摘要:
湖泊沉积物碳库作为湖泊生态系统的重要组成部分,对湖泊碳循环起重要作用,而蓝藻水华衰亡过程对湖泊碳库稳定性影响研究较少.本研究采集太湖蓝藻、湖水、沉积物样品,建立蓝藻-水-沉积物室内模拟实验系统,分析蓝藻水华衰亡过程中沉积物碳库易氧化有机碳(EOC)、惰性有机碳(ROC)、微生物量碳(MBC)、轻组有机碳(LFOC)和重组有机碳(HFOC)的变化规律,探究蓝藻水华衰亡过程对湖泊碳库稳定性的影响.结果表明,蓝藻水华衰亡前期(1~9天),ROC缓慢下降,EOC和LFOC快速下降,MBC有所增加;衰亡中期(10~45天),沉积物TOC和ROC含量升高;衰亡末期(46~63天),HFOC和ROC等稳定有机碳进入一个从缓慢分解逐渐趋于稳定的阶段.周期性的蓝藻水华暴发、衰亡和湖泊稳定性有机碳的日渐累积,最终会对沉积物碳库有机碳组分及其稳定造成显著影响.
关键词:  沉积物碳库  有机碳  蓝藻  碳循环
DOI:10.18307/2020.0212
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07203-003)、国家自然科学基金项目(41573061)和安徽省高校自然科学研究重点项目(KJ2019A0667)联合资助.
Effect of the decline of cyanobacterial bloom on the organic carbon composition of lake sediment carbon pool
WANG Xuan1,2, LI Zhichun1,2,3, LI Xiang1,2, XU Xiaoguang1,2, ZHANG Siyuan1,2, WANG Huimin1, LI Rongqiang1, WANG Guoxiang1,2
1.School of Environment, Nanjing Normal University, Nanjing 210023, P. R. China;2.Jiangsu Center for Collaborative Innovation in Geographical Information Resource development and application, Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Jiangsu Engineering Lab of Water and Soil Eco-remediation, Nanjing 210023, P. R. China;3.School of Environment and Surveying Engineering, Suzhou University, Anhui 234000, P. R. China
Abstract:
Sedimentary carbon pool, as an important part of lake ecosystems, plays an important role in carbon cycle. However, there is little information on the impact of the cyanobacteria decomposition on the stability of sedimentary carbon pool. In this study, a simulated water-cyanobacteria-sediment system was established to investigate the effects of algal-derived organic carbon during the decline of cyanobacteria on easily oxidized organic carbon (EOC), recalcitrant organic carbon (ROC), microbial biomass carbon (MBC), light fraction organic carbon (LFOC) and heavy fraction organic carbon (HFOC) of sedimentary carbon pool. The results showed that, in the early stage of incubation (1-9 Days), ROC declined slowly, EOC and LFOC declined rapidly, in contrast, MBC increased. After incubation of 10-45 Days, the sediment TOC and ROC content increased. At the end of experiment (46-63 Days), organic carbon contents such as HFOC and ROC only slightly changed. With the outbreak of periodic cyanobacterial blooms, decomposition and accumulation of organic carbon in lake sediments will have a significant impact on the organic carbon composition and stability of the sediment carbon pool.
Key words:  Sediment carbon pool  organic carbon  cyanobacteria  carbon cycle
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