[1]赵宗权,张 洁,焦树林*,等.龙滩水库溶解无机碳来源及变化特征[J].山地学报,2020,(1):19-30.[doi:10.16089/j.cnki.1008-2786.000487]
　ZHAO Zongquan,ZHANG Jie,JIAO Shulin*,et al.Sources and Variation Characteristics of Dissolved Inorganic Carbon in Longtan Reservoir, China[J].Mountain Research,2020,(1):19-30.[doi:10.16089/j.cnki.1008-2786.000487]
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龙滩水库溶解无机碳来源及变化特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年第1期
页码:
19-30
栏目:
山地环境
出版日期:
2020-02-01

文章信息/Info

Title:
Sources and Variation Characteristics of Dissolved Inorganic Carbon in Longtan Reservoir, China
文章编号:
1008-2786-(2020)1-019-12
作者:
赵宗权1; 2;  张 洁1; 2;  焦树林1; 2*;  莫跃爽1; 2;  曹玉平1; 2
1.贵州师范大学 地理与环境科学学院,贵阳 550025; 2.贵州省山地资源与环境遥感应用重点实验室,贵阳 550025
Author(s):
ZHAO Zongquan1; 2;  ZHANG Jie1; 2;  JIAO Shulin1; 2*;  MO Yueshuang1; 2;  CAO Yuping1; 2
1.School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550025, China; 2.Key Laboratory of Remote Sensing Application on Mountain Resources and Environment in Guizhou Province, Guiyang 550025, China
关键词:
溶解无机碳;  碳稳定同位素;  筑坝;  龙滩水库;  红水河
Keywords:
dissolved inorganic carbon;  stable carbon isotope;  damming;  Longtan Reservoir;  Hongshui River
分类号:
P593; P951
DOI:
10.16089/j.cnki.1008-2786.000487
文献标志码:
A
摘要:
河流在碳的运输过程中扮演着重要角色。为探究河流筑坝拦截后龙滩水库溶解无机碳(DIC)的来源和变化特征,于2016年7月和2017年1月采集水样,然后分析了河水DIC及其碳稳定同位素(δ13C)值。研究结果表明:(1)δ13CDIC值具有显著的时空差异,表明两个季节影响DIC的主要因素和DIC的来源并不相同。雨季,DIC及其 δ13C主要分布在2.04～4.12 mmol·L-1和-5.52‰～-2.87‰的范围内; 旱季,水体DIC为3.33～4.61 mmol·L-1,而δ13CDIC显著低于雨季为-15.90‰～-9.12‰。雨季,稀释效应显著降低了DIC浓度,由于水体热分层使得DIC在水柱剖面上差异显著,而旱季由于混合作用的影响,在剖面上差异较低。(2)在雨季,河流 δ13CDIC较旱季明显偏正,碳酸盐岩的强烈风化输入大量HCO3-是DIC的主要来源。在旱季,DIC和 δ13CDIC成反比关系, δ13CDIC在旱季变得更低,其大部分的DIC来自于土壤CO2输入和原位有机呼吸作用。旱季水体热分层消失,混合作用使得底部具有较低 δ13C值的含碳水体上涌,并与表水层混合导致其 δ13CDIC值低于雨季。这种季节性模式与自然河流不同,而是与湖泊的季节变化特征更为类似,说明河流拦截蓄水后逐渐湖沼化,并显著影响了DIC的循环。
Abstract:
Rivers are crucial in the transportation of carbon. In order to determine the composition and variation of dissolved inorganic carbon(DIC)in Longtan Reservoir after damming and interception, water samples were collected in July 2016 and January 2017 respectively, and then the DIC and its stable carbon isotope(δ13C)values were analyzed. The results showed that:(1)The δ13CDIC values of reservoir had significant temporal and spatial differences, indicating that the main factors and sources of DIC were different during dry and rainy seasons. In rainy season, the DIC and δ13C of reservoir were distributed in the range of 2.04 ～ 4.12 mmol·L-1 and -5.52‰～-2.87‰ respectively; in dry season, the DIC of water was3.33 ～ 4.61 mmol·L-1, while δ13CDIC was significantly lower than that in rainy season, which was -15.90‰～-9.12‰. In rainy season, the diluted effect significantly reduced the concentration of DIC. Because of the thermal stratification of water, the difference of DIC on the water column was significant, while in the dry season, due to the influence of mixing, the difference was lower on the water column.(2)In rainy season, the δ13CDIC of the river was obviously more positive than that in dry season, and the strong weathering of carbonate rocks input a large amount of HCO-3, which was the main source of DIC. In dry season, DIC was inversely proportional to δ13CDIC, and δ13CDIC became lower in the dry season, indicating that most of the DIC came from soil CO2 and situ organic respiration. The thermal stratification of reservoir disappeared in dry season, and the mixing action made the monimolimnion with lower δ13C value upwelling, and mixing with the epilimnion subsequently resulted in its δ13CDIC value lower than that in rainy season. This seasonal variation was different from that of natural rivers, but more similar to the seasonal variation of lakes, indicating that the river gradually became limnetic after interception and impoundment, which significantly affected the cycle of DIC.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-08-05; 改回日期(Accepted date):2020-01-23
基金项目(Foundation item):国家自然科学基金(41263011); 贵州省国内一流学科建设项目“贵州师范大学地理学”(黔教科研发[2017]85号)。[National Natural Science Foundation of China(41263011); Guizhou Province First-Class Subject Construction Project “Geography of Guizhou Normal University”(85[2017])]
作者简介(Biography):赵宗权(1992-), 男, 安徽阜阳人,硕士研究生,主要研究方向:环境变化与地表水体碳循环。[ZHAO Zongquan(1992-), male, born in Fuyang, Anhui province, M.Sc. candidate, research on environmental change and carbon cycle of surface water] E-mail: zhaozq1992@126.com
*通讯作者(Corresponding author):焦树林(1969-),男,教授,博士生导师,主要研究方向:流域地表过程与环境变化。[JIAO Shulin(1969-), male, professor, Ph.D. supervisor, research on surface process and environmental change in watershed] E-mail: jiaoshulin@gznu.edu.cn
更新日期/Last Update: 2020-01-30