Hydrochemical characteristics and the ecological effect of algal carbonic anhydrase in carbon cycle in the Taiyuan section of Fenhe River  

作　　者：Jing YANG Xin LI Shulian XIE Jia FENG 

机构地区：[1]Shanxi Key Laboratory of Yuncheng Salt Lake Ecological Protection and Resource Utilization,College of Life Sciences,Yuncheng University,Yuncheng 044000,China [2]School of Life Science,Shanxi University,Taiyuan 030006,China

出　　处：《Journal of Oceanology and Limnology》2024年第5期1507-1524,共18页海洋湖沼学报（英文）

基　　金：Supported by the Fundamental Research Program of Shanxi Province(Nos.202103021223266,202203021211313,202303021211114,202303021222246);the Excellent Doctoral Research Project in Shanxi Province(No.QZX-2023005);the Shanxi Scientific and Technological Innovation Team of Halophiles Resources Utilization(No.202204051001035)。

摘　　要：Water scarcity and pollution pose a threat to the sustainable development of cities and society.Therefore,it is crucial to analyze the hydrochemical characteristics and carbon dynamics of waterdeficient areas.Taking the Taiyuan section of Fenhe River as the research object,we systematically explored the hydrochemical characteristics of surface water and its evolutionary processes,as well as the ecological effect of algal carbonic anhydrase in carbon cycle using the hydrochemical evolution method and correlation analysis.The ternary diagram demonstrates that the main water chemical type in Fenhe River was SO^(2-)_(4)·Cl^(-)-Na^(+).The Gibbs and end-member diagrams of each ion display that the chemical composition of surface water was mainly controlled by silicate decomposition.The chemical ions originated mainly from dissolution of some minerals,such as plagioclase,halite,dolomite,calcite,and gypsum.The diatoms had a lower CO_(2)requirement because they exhibited a higher abundance at a lower partial pressure of CO_(2)(p CO_(2)).However,high CO_(2)concentration had a positive effect on cyanobacteria,which reduced the active transport of HCO_(3)^(-),saved the energy needed for this part of active transport,and indirectly improved the overall photosynthetic efficiency of algae.Carbonic anhydrase(CA)activity was significantly negatively correlated with p CO_(2)and positively correlated with HCO_(3)^(-)concentration,indicating that CA in water promoted the conversion of CO_(2)to HCO_(3)^(-).The HCO_(3)^(-)generated from this process continued to participate in the erosion of silicate rocks,sequestering CO_(2)in the form of Ca CO_(3),which has a non-negligible impact on the carbon sink in the Fenhe River.These consequences may have important implications for the biogeochemical cycling occurring in urban water.

关 键 词：HYDROCHEMISTRY inorganic carbon phytoplankton community carbonic anhydrase Fenhe River 

分 类 号：P342[天文地球—水文科学] X143[天文地球—地球物理学]