喀斯特水库碳、硅耦合循环:以红枫湖、普定水库和平寨水库为例  

Coupled Cycling of Carbon and Silica in Karst Reservoirs:Insights from Hongfeng Lake,Puding Reservoir and Pingzhai Reservoir

作　　者：魏榆 杨昌平 晏浩 刘再华[1] WEI Yu;YANG Changping;YAN Hao;LIU Zaihua(State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Chemical Engineering,Guizhou Institute of Technology,Guiyang 550003,China)

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]中国科学院大学,北京100049 [3]贵州理工学院化学工程学院,贵阳550003

出　　处：《地球与环境》2020年第1期1-9,共9页Earth and Environment

基　　金：国家自然科学基金委员会—贵州喀斯特科学研究中心联合基金重大项目(U1612441);国家自然科学基金项目(41430753、41673019)。

摘　　要：通过研究红枫湖、普定水库和平寨水库三个喀斯特水库的碳、硅循环,探讨了水库碳-硅循环的耦合关系。藻类光合作用导致表层水体溶解硅(DSi)及溶解无机碳(DIC)的亏损;当DSi供应不足时,硅藻生长繁殖大量消耗DSi,导致DSi相对DIC快速亏损。沉降颗粒物中内源有机碳含量越高,生物硅(BSi)及有机碳(OC)含量越高,但OC/BSi受控于硅藻对沉积物有机碳贡献率,且与之呈反比。生物硅与有机碳含量之比K值(K=BSi/OC)可作为硅藻贡献率的潜在替代指标,并与之呈正相关;生物硅与内源有机碳(OCauto)含量之比Kauto值(Kauto=BSi/OCauto)可作为水体富营养化程度的潜在替代指标,并与富营养化程度呈负相关。We studied carbon and silicon cycles in Hongfeng Lake,Puding Reservoir and Pingzhai Reservoir and discussed the coupled cycling of carbon and silicon.Photosynthesis caused depletions of dissolved silicon(DSi)and dissolved inorganic carbon(DIC)in the surface water of reservoirs.When the DSi supply is limited,DSi is utilized by diatom and the DSi depletion will happen.Concentrations of organic carbon(OC)and biogenic silicon(BSi)increase when the contribution of autochthonous organic carbon(OCauto)to settled particles increases,the OC/BSi ratio is controlled and relates negatively with the contribution of diatom to OC.The K value(K=BSi/OC),which positively relates with the contribution of diatom to OC,can be used as an indicator of the contribution of diatom to OC.The Kauto(Kauto=BSi/OCauto)relates positively with the eutrophication degree and can be regard as an indicator of the degree of eutrophication.

关 键 词：喀斯特水库 碳循环 硅循环 生物硅 

分 类 号：P593[天文地球—地球化学] X142[天文地球—地质学]