摘要
在“岩溶效应”背景下,对典型喀斯特地区水库中溶解性有机碳(DOC)进行探究,有助于提高对水体有机碳循环过程及机理的认识.本研究联合运用双碳同位素(δ^(13)C-Δ^(14)C),对喀斯特地区夏季开放型水库(阿哈水库)和封闭型水库(观山湖)的DOC来源进行示踪,定量其端元贡献率,辨析差异性.并结合阿哈水库入库水流量,对丰水期生物源和岩石源DOC输入量分别进行估算,进一步细化了水库碳源汇过程.结果显示,夏季阿哈水库DOC平均含量((5.39±0.39) mg·L^(-1))低于观山湖((6.29±0.47) mg·L^(-1)).其中,入库河流携带的DOC是阿哈水库DOC的主要来源(贡献值为55%±22%),其次为藻类(29%±10%),最小的是沉积物(16%±7%),而观山湖DOC的主要来源为藻类(60%±15%).河流向阿哈水库输入岩石碳通量为0.24 t·km^(-2)·月-1,生物源碳通量为0.43 t·km^(-2)·月^(-1),所以夏季水库汇集岩石碳量不可忽视.本研究表明,喀斯特地区开放和封闭型水库DOC的迁移转化过程差异显著,入库河流向水库输送生物源碳量较大,水库对岩石源“老碳”具有汇的作用.
In the background of the“karst effect”,investing the migration and transformation of dissolved organic carbon(DOC)in karst reservoirs will help to improve the understanding of the process and mechanism of the organic carbon cycle.We used the two-carbon isotope method(δ^(13)C-Δ^(14)C)to trace the sources of DOC in an open reservoir(Aha reservoir)and a closed reservoir(Guanshan Lake)in summer,and assess its sources(biospheric and petrogenic DOC from rivers,i.e.DOCbio and DOCpetro,respectively).The results showed that the DOC in Aha Reservoir((5.39±0.39)mg·L^(-1))was lower than that in Guanshan Lake((6.29±0.47)mg·L^(-1)).In the Aha reservoir,the inflow rivers were the largest contributor of DOC,which accounted for 55%±22%,followed by the algae(29%±10%),and the last was sediment(16%±7%).While in the Guanshan Lake,the algae played as the largest contributor(60%±15%).In the open reservoir,the inflow rivers transported about 0.24 t·km^(-2)·mon-1 DOCpetro and 0.43 t·km^(-2)·mon^(-1) DOCbio. Hence there exists a significant difference between open and closed reservoirs regarding the migration and transformation of DOC in karst areas, and the open reservoirs played as a huge sink for “old carbon” derived from rocks.
作者
刘浩
王琴淋
于霞
邱泽琼
陈小草
程鹏
安艳玲
LIU Hao;WANG Qinlin;YU Xia;QIU Zeqiong;CHEN Xiaocao;CHENG Peng;AN Yanling(College of Resources and Environmental Engineering,Guizhou Institute of Technology,Guiyang 550003;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061;Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application,Xi’an Accelerator Mass Spectrometry Center,Xi’an 710061;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081;Key Laboratory of Karst Geological Resources and Environment(Guizhou University),Ministry of Education,Guiyang 550025;College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第8期383-392,共10页
Acta Scientiae Circumstantiae
基金
中国科学院战略性先导项目(B类)课题(No.XDB4000000)
黄土与第四纪地质国家重点实验室开放基金(No.SKLLQG2036)
贵州省科技支撑计划(No.黔科合基础-ZK[2024]一般511)
2023年贵州理工学院高层次人才科研启动项目(No.2023GCC082)。
