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梯级水库群水体碳、硫元素循环及耦合效应——以嘉陵江为例

杨梦迪1,崔高仰2,3,李亲凯1,黄俊2,3,李斯奇1,张俊1,陶月乐1,李晓东1*   

  1. 1天津大学表层地球系统科学研究院, 天津 300072;2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 550081;3中国科学院大学, 北京 100049)
  • 出版日期:2018-03-10 发布日期:2018-03-10

The cycle and coupling effect of carbon and sulfur in cascade reservoirs: A case study of Jialing River.

YANG Meng-di1, CUI Gao-yang2,3, LI Qin-kai1, HUANG Jun2,3, LI Si-qi1, ZHANG Jun1, TAO Yue-le1, LI Xiao-dong1*   

  1. (1 Institute of SurfaceEarth System Science, Tianjin University, Tianjin 300072, China; 2State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; 3University of Chinese Academy of Sciences, Beijing 100049, China)
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  • Online:2018-03-10 Published:2018-03-10

摘要: 河流筑坝拦截对水体碳、氮、硫等元素的生物地球化学循环产生了重要影响。为了研究在梯级水库影响下C、S元素循环的响应过程,本研究以嘉陵江干流4座代表性的梯级水库为对象,于2016年冬季(1月)和夏季(7月)采集各个水库的河流入库水、库区分层水和下泄水,分析DIC浓度、SO42-浓度和δ13CDIC及δ34SSO42-。结果表明:(1)研究区水体的水化学组成主要受碳酸对碳酸盐风化控制,同时,来源于流域黄铁矿和大气SO2氧化产生的H2SO4也广泛参与到区域碳酸盐岩风化;(2)DIC主要来源于土壤CO2和碳酸盐岩风化,SO42-主要受大气降水和黄铁矿氧化过程影响;(3)水库水体DIC浓度、SO42-浓度、δ34S值及δ13CDIC值两两之间存在相关性(P<0.05),表明水库水体C、S元素的时空演变受到相似过程(物理、化学、生物)的影响。经过筑坝拦截,河流水环境及营养元素循环发生很大改变,运用C、S双同位素可以有效示踪水库的湖沼化演化过程。

关键词: 水溶性离子特征, PM2.5吸附量, 叶表面形态, 污染程度

Abstract: Damming on the rivers has important effects on biogeochemical cycles of carbon,nitrogen and sulfur. To clarify the responses of C and S elements under the influence of cascade reservoirs, four representative cascade reservoirs in Jialing River were selected as the research objects. Samples of inflow, outflow, and stratified water in four cascade reservoirs were collected in winter (January) and summer (July) of 2016. Dissolved inorganic carbon (DIC) concentration, SO42- concentration and isotopic compositions of δ13CDIC and δ34S were analyzed. The results showed that: (1) Water chemistry was mainly controlled by carbonic acid balance. At the same time, H2SO4, derived from pyrite and atmospheric SO2 oxidation, was widely involved in regional carbonate weathering; (2) DIC was mainly affected by soil CO2 and carbonate. SO42- was mainly controlled by precipitation and pyrite oxidation process; (3) Significant correlations (P<0.05) existed among paired characters of reservoir water DIC concentration, SO42- concentration, δ34S value and δ13CDIC value, indicating that the spatial and temporal dynamics of C and S elements in reservoir were affected by similar processes (physical, chemical, and biological). After intercepting of the dam, the river water environment and nutrient cycle had undergone great changes. The use of C and S double isotopes can effectively track the limnetic evolution of reservoirs.

Key words: pollution degree, leaf surface morphology, PM25 adsorption amount, water-soluble ionic characteristics