文献类型：期刊文献

英文题名：High stability of autochthonous dissolved organic matter in karst aquatic ecosystems: Evidence from fluorescence

作者：Xia, Fan Liu, Zaihua Zhao, Min Li, Qiang Li, Dong Cao, Wenfang Zeng, Cheng Hu, Yundi Chen, Bo Bao, Qian Zhang, Yi He, Qiufang Lai, Chaowei He, Xuejun Ma, Zhen Han, Yongqiang He, Haibo

第一作者：Xia, Fan

通信作者：Liu, ZH[1]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Chinese Acad Sci, Puding Karst Ecosyst Res Stn, Chinese Ecosyst Res Network, Puding 562100, Peoples R China;[4]CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China;[5]China Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R China;[6]Guizhou Inst Technol, Resources & Environm Engn, Guiyang 550008, Peoples R China;[7]Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400700, Peoples R China;[8]Chinese Acad Geol Sci, Inst Karst Geol, Key Lab Karst Dynam, Minist Nat Resources Guangxi, Guilin 541004, Peoples R China;[9]Guizhou Univ Finance & Econ, Guiyang 550025, Peoples R China;[10]Sichuan Normal Univ, Key Lab Land Resources Evaluat & Monitoring Southw, Minist Educ, Chengdu 610066, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China.

年份：2022

卷号：220

外文期刊名：WATER RESEARCH

收录：;EI(收录号：20222412224318);Scopus(收录号：2-s2.0-85131715059);WOS:【SCI-EXPANDED(收录号:WOS:000815781200001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (42130501, 42141008, 42177248, 42072278 and 41921004) , the Strategic Priority Research Program of Chinese Acad-emy of Sciences (XDB40020000) and the Natural Science Foundation of Guizhou Province ( [2020] 1Y412) , Youth Science and Technology Talent Growth Program of Guizhou Provincial Education Department (Grant No.KY [2021] 137) and Guizhou Science and Technology Department Fund (Grant No. [2021] 456) .

语种：英文

外文关键词：BCP; Autochthonous dissolved organic matter; Stability; Planktonic bacteria; Karst aquatic ecosystem; EEM-PARAFRAC

摘要：Biological carbon pump (BCP) in karst areas has received intensive attention for years due to their significant contribution to the global missing carbon sink. The stability of autochthonous dissolved organic matter (Auto-DOM) produced by BCP in karst aquatic ecosystems may play a critical role in the missing carbon sink. However, the source of dissolved organic matter (DOM) in inland waters and its consumption by planktonic bacteria have not been thoroughly examined. Recalcitrant dissolved organic matter (RDOM) may exist in karst aquatic ecosystem as in the ocean. Through the study of the chromophoric dissolved organic matter (CDOM) and the interaction between CDOM and the planktonic bacterial community under different land uses at the Shawan Karst Water-carbon Cycle Test Site, SW China, we found that C2, as the fluorescence component of Auto-DOM mineralised by planktonic bacteria, may have some of the characteristics of RDOM and is an important DOM source in karst aquatic ecosystems. The stability ratio (Fmax((C2/(C1+C2)))) of Auto-DOM reached 89.6 +/- 6.71% in winter and 64.1 +/- 7.19% in spring. Moreover, correlation-based network analysis determined that the planktonic bacterial communities were controlled by different fluorescence types of CDOM, of which C1 (fresh Auto-DOM), C3 (conventional allochthonous DOM (Allo-DOM)) and C4 (the Allo-DOM mineralised by bacteria) were clustered in one module together with prevalent organic-degrading planktonic bacteria; C2 was clustered in another tightly combined module, suggesting specific microbial utilization strategies for the C2 component. In addition, some important planktonic bacterium and functional genes (including chemotrophic heterotrophs and photosynthetic bacteria) were found to be affected by high Ca2+ and dissolved inorganic carbon (DIC) concentrations in karst aquatic ecosystems. Our research showed that Auto-DOM may be as an important carbon sink as the Allo-DOM in karst ecosystems, the former generally being neglected based on a posit that it is easily and first mineralized by planktonic bacteria.