冬季汾河太原段水体pCO_(2)的分布变化及影响因素  

Distribution and influencing factors of pCO_(2)in the Taiyuan Section of the Fenhe River in winter

作　　者：党佳佳 李云霄 DANG Jiajia;LI Yunxiao(College of Resource and Environment,Shanxi Agricultural University,Taigu 030801,China)

机构地区：[1]山西农业大学资源环境学院,太谷030801

出　　处：《环境保护科学》2025年第1期89-95,共7页Environmental Protection Science

基　　金：国家自然科学基金(41376123);山西省基础研究计划青年项目(20210302124317);山西省高等学校科技创新项目(2020L0151)。

摘　　要：逐渐增强的人为干扰导致黄土区河流水系CO_(2)变化及其控制越发复杂,特别是城市化河段。基于2020年11月至次年4月对汾河太原段3个固定站点(兰村站、祥云桥站和汾河二坝桥站)碳酸盐参数的月间调查,探讨了表层水CO_(2)分压(pCO_(2))的时空分布和影响因素。结果显示:相较于作为背景断面的兰村站高的溶解无机碳(DIC)(40.8 mg/L)和pCO_(2)(643μatm)水平,水生初级生产使得位于生态修复公园的祥云桥站DIC(37.9 mg/L)和pCO_(2)(574μatm)有所降低;城市污水的直接输入和有机物的降解使得位于市区下游的汾河二坝桥站DIC(55.7 mg/L)和pCO_(2)(4413μatm)明显升高。同时,在月间上,初级生产和有机物的降解分别是祥云桥站和汾河二坝桥站p CO_(2)变化的主导因素。整体上,3个站位在冬季都表现为大气CO_(2)的源,但相较于兰村站的水—气CO_(2)通量(169.0 mmol/m^(2)/d),祥云桥站(14.0 mmol/m^(2)/d)和汾河二坝桥站(2832.4 mmol/m^(2)/d)的CO_(2)通量呈现一减一增的变化过程,可见,生态修复和污水输入之间的博弈关系可能是促进城市河流CO_(2)增汇减源的关键。The increasing anthropogenic interference makes the CO_(2)change of river system and its control more complicated in loess area,especially in urbanized river reach.Based on the monthly investigation of carbonate parameters at three fixed stations(Lancun Station,Xiangyunqiao station and Fenhe Erbaqiao Station)in Taiyuan Section of the Fenhe River from November 2020 to April next year,the temporal and spatial distribution of surface water partial pressure of CO_(2)(pCO_(2))and its influencing factors were discussed.The results showed that compared with the dissolved inorganic carbon(DIC)(40.8 mg/L)and pCO_(2)(643μatm)levels of Lancun station as the background section,the DIC(37.9 mg/L)and pCO_(2)(574μatm)levels of Xiangyunqiao Station located in the ecological restoration park were reduced by aquatic primary production.DIC(55.7 mg/L)and pCO_(2)(4413μatm)increased significantly in Erbaqiao Station downstream of the city due to the direct input of municipal sewage and degradation of organic matter.At the same time,the primary production and the degradation of organic matter are the main factors of pCO_(2)change in Xiangyunqiao Station and Fenhe Erbaqiao Station,respectively.On the whole,all the three stations were atmospheric CO_(2)sources in winter,but compared with the water-air CO_(2)flux of Lancun Station(169.0 mmol/m^(2)/d).The CO_(2)flux of Xiangyunqiao Station(14.0 mmol/m^(2)/d)and Fenhe Erbaqiao Station(2832.4 mmol/m^(2)/d)showed a decreasing and increasing process,indicating that the game relationship between ecological restoration and sewage input may be the key to promote the increase of CO_(2)sink and decrease of CO_(2)source in urban rivers.

关 键 词：溶解无机碳(DIC) CO_(2)分压(pCO_(2)) 水生初级生产 污水输入 汾河太原段 

分 类 号：X522[环境科学与工程—环境工程]