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

溶解有机碳 有色溶解有机物 浮游生物 水生生态系统 环境科学 环境化学 有机质 碳循环 淡水生态系统 生态系统 喀斯特 浮游细菌 总有机碳 生态学 化学 浮游植物 生物 营养物 古生物学
作者
Fan Xia,Zaihua Liu,Min Zhao,Qiang Li,Dong Li,Wenfang Cao,Cheng Zeng,Yundi Hu,Bo Chen,Qian Bao,Yi Zhang,Qiufang He,Chaowei Lai,Xuejun He,Zhen Ma,Yongqiang Han,Haibo He
出处
期刊:Water Research [Elsevier BV]
卷期号:220: 118723-118723 被引量:48
标识
DOI:10.1016/j.watres.2022.118723
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.
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