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    酸雨对桂林枯水期岩溶地下水δ13CDIC及碳汇效应的影响

    黄奇波 覃小群 刘朋雨 唐萍萍

    黄奇波, 覃小群, 刘朋雨, 唐萍萍, 2015. 酸雨对桂林枯水期岩溶地下水δ13CDIC及碳汇效应的影响. 地球科学, 40(7): 1237-1247. doi: 10.3799/dqkx.2015.103
    引用本文: 黄奇波, 覃小群, 刘朋雨, 唐萍萍, 2015. 酸雨对桂林枯水期岩溶地下水δ13CDIC及碳汇效应的影响. 地球科学, 40(7): 1237-1247. doi: 10.3799/dqkx.2015.103
    Huang Qibo, Qin Xiaoqun, Liu Pengyu, Tang Pingping, 2015. Impact of Acid Rain to δ13CDIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin. Earth Science, 40(7): 1237-1247. doi: 10.3799/dqkx.2015.103
    Citation: Huang Qibo, Qin Xiaoqun, Liu Pengyu, Tang Pingping, 2015. Impact of Acid Rain to δ13CDIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin. Earth Science, 40(7): 1237-1247. doi: 10.3799/dqkx.2015.103

    酸雨对桂林枯水期岩溶地下水δ13CDIC及碳汇效应的影响

    doi: 10.3799/dqkx.2015.103
    基金项目: 

    中国地质调查项目 12120113005200

    国家自然科学基金项目 41302211

    详细信息
      作者简介:

      黄奇波(1982-), 男, 博士研究生, 主要从事岩溶水文地质科研工作.E-mail: qbohuang0108@163.com

    • 中图分类号: P631

    Impact of Acid Rain to δ13CDIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin

    • 摘要: 定量评价硫酸对岩溶碳汇效应的影响有助于提高岩石风化碳汇通量估算精度, 对当前全球气候变化研究意义重大.选取受酸雨影响的桂林岩溶区为研究对象, 在枯水期对研究区14个岩溶大泉和15条地下河水化学成分和碳同位素进行了测试分析, 结果表明: 岩溶大泉和地下河中阳离子以Mg2+和Ca2+为主, 阴离子以HCO3-为主, 分别占阳离子和阴离子组成的90%以上, SO42-含量较低, 其含量范围为0.004~0.213mmol/L; 所占阴离子组成比例为0.12%~6.11%;δ13CDIC、[Ca2++Mg2+]/[HCO3-]更偏向于碳酸溶解端元, 离硫酸溶解端元距离远, 证实硫酸参与碳酸盐岩的溶解对地下水无机碳(dissolved inorganic carbon, 简称DIC)及δ13CDIC的影响有限; 与Sr2+/Ca2+值一样, δ13CDIC主要受径流条件控制, 其大小可以反映地下水径流条件的强弱.利用化学计量关系计算出由硫酸溶蚀碳酸盐岩的平均比例为22.64%, 产生的DIC(HCO3-H2SO4)占总DIC的平均比例为13.04%, 碳酸产生的DIC(HCO3-H2CO3)占地下水总DIC的比例为86.96%, 其中来源于土壤大气中的HCO3-比例为43.48%.因此, 扣除硫酸对地下水中DIC的贡献后, 岩溶碳汇效应将减少13.04%.

       

    • 图  1  桂林水文地质图

      1.灰岩;2.灰岩与白云岩互层;3.碳酸盐岩夹碎屑岩;4.非碳酸盐岩;5.地层分布界线;6.岩溶泉及编号;7.地表河流;8.地下河及出口和编号

      Fig.  1.  Hydrogeological map of Guilin

      图  2  地下水主要离子三角图

      Fig.  2.  Ternary diagrams of groundwater chemical composition

      图  3  地下水中Sr2+/Ca2+δ13CDIC之间的关系

      Fig.  3.  Co-variation of inorganic carbon isotope (δ13CDIC) value vs. Sr2+/Ca2+ value in groundwater

      图  4  地下水[Ca2++Mg2+]/[HCO3-]与[SO42-]/[HCO3-]的当量比值关系

      Fig.  4.  Equivalent ratios of [Ca2++Mg2+]/[HCO3-] vs. [SO42-]/[HCO3-] in groundwater

      图  5  地下水δ13CDIC与[Ca2++Mg2+]/[HCO3-]比值相互变化特征

      Fig.  5.  Variations of δ13CDIC vs. [Ca2++Mg2+]/[HCO3-] in karst groundwater

      图  6  SO42-浓度与硫酸溶蚀碳酸盐岩的比例((Ca(1-x)Mgx)CO3H2SO4)关系(a)和与硫酸产生的HCO3-(HCO3-H2SO4)占总[HCO3-]的比例关系(b)

      Fig.  6.  Co-variation of SO42- vs. proportion of carbonate rock produced by sulfuric acid (a) and DIC(HCO3-H2SO4) produced by sulfuric acid (b)

      表  1  桂林地区岩溶地下水水化学特征

      Table  1.   The chemical compositions of karst groundwater in Guilin

      类型 编号 经度 纬度 pH 水温(℃) 电导率(μs/cm) K+(mmol/L) Na+(mmol/L) Ca2+ (mmol/L) Mg2+ (mmol/L) Cl- (mmol/L) SO42- (mmol/L) HCO3- (mmol/L) Sr2+ (μmol/L) Sr2+/Ca2+ (10-3) ZT+(%) ZT-(%) NICB (%) δ13CDIC (‰) 硫酸溶蚀碳酸盐岩的比例(%) [HCO3-]/[H2CO3]的比例(%)
      岩溶大泉 A01 110°14′18″ 25°27′36″ 7.30 20.3 288 0.010 0.031 1.609 0.071 0.125 0.087 2.796 0.696 0.433 3.40 3.09 4.7 -12.29 29.16 17.07
      A02 110°23′18″ 25°28′21″ 7.48 20.7 301 0.040 0.064 1.542 0.103 0.174 0.084 2.889 0.695 0.451 3.40 3.23 2.5 -10.79 19.60 10.86
      A03 110°18′26″ 25°26′48″ 7.39 19.6 378 0.015 0.033 2.085 0.062 0.174 0.140 3.821 0.735 0.353 4.34 4.27 0.8 -14.20 18.30 10.07
      A04 110°22′01″ 25°04′03″ 7.50 15.8 341 0.005 0.009 1.850 0.200 0.075 0.128 3.541 0.667 0.360 4.11 3.87 3.0 -13.43 23.43 13.27
      A05 110°33′06″ 24°56′21″ 7.25 21.4 419 0.015 0.062 1.887 0.560 0.174 0.193 4.100 0.716 0.379 4.97 4.66 3.2 -11.94 29.37 17.21
      A06 111°20′10″ 24°15′00″ 7.28 21.2 316 0.012 0.016 1.551 0.355 0.125 0.087 3.308 0.621 0.400 3.84 3.61 3.1 -10.66 22.37 12.59
      A07 111°15′42″ 24°23′58″ 7.87 13.9 492 0.056 0.120 2.291 0.565 0.349 0.163 4.846 0.688 0.300 5.89 5.52 3.2 -11.10 27.61 16.02
      A08 111°02′22″ 24°24′38″ 7.14 21.6 385 0.017 0.035 1.815 0.443 0.224 0.107 3.821 0.621 0.342 4.57 4.26 3.5 -12.88 27.37 15.85
      A09 111°07′00″ 24°29′35″ 7.39 21.9 271 0.030 0.086 1.138 0.434 0.174 0.027 2.842 0.480 0.422 3.26 3.07 3.0 -9.48 14.01 7.53
      A10 111°01′30″ 25°06′45″ 7.43 20.5 309 0.025 0.043 1.527 0.246 0.174 0.008 3.215 1.374 0.900 3.61 3.41 3.0 -9.24 14.00 7.53
      A11 110°53′20″ 25°06′50″ 7.61 21.4 266 0.011 0.028 1.296 0.247 0.174 0.028 2.749 0.391 0.302 3.13 2.98 2.4 -10.90 16.61 9.06
      A12 110°42′27″ 24°41′22″ 7.04 21.1 365 0.007 0.014 1.760 0.408 0.100 0.064 3.867 0.968 0.550 4.36 4.10 3.1 -11.81 17.95 9.86
      A13 110°21′25″ 24°37′53″ 7.18 21.7 326 0.031 0.060 1.486 0.588 0.249 0.143 3.495 0.727 0.489 4.24 4.03 2.5 -12.28 27.85 16.17
      A14 110°23′09″ 24°15′03″ 7.66 16.5 412 0.018 0.057 1.975 0.405 0.199 0.100 4.147 0.714 0.362 4.83 4.55 3.1 -11.67 22.43 12.63
      地下河 B01 110°37′14″ 25°34′26″ 8.09 14.4 201 0.014 0.025 0.909 0.162 0.174 0.060 1.677 0.475 0.523 2.18 1.97 5.0 -12.33 36.61 22.40
      B02 110°33′23″ 25°14′11″ 7.65 18.3 373 0.017 0.029 2.024 0.190 0.125 0.105 3.867 0.752 0.372 4.47 4.20 3.1 -14.41 21.73 12.19
      B03 110°31′06″ 25°11′23″ 7.61 19.8 297 0.015 0.023 1.512 0.547 0.150 0.117 3.518 0.479 0.317 4.16 3.90 3.1 -12.70 25.42 14.56
      B04 110°31′35″ 25°11′38″ 8.25 17.5 358 0.013 0.022 1.341 0.448 0.174 0.004 3.122 0.566 0.422 3.61 3.30 4.5 -12.38 21.12 11.81
      B05 110°30′53″ 25°04′45″ 8.00 19.0 317 0.011 0.016 1.524 0.184 0.125 0.005 3.169 0.579 0.380 3.44 3.30 2.1 -13.83 9.56 5.02
      B06 110°59′41″ 24°30′19″ 7.15 20.7 428 0.018 0.052 2.164 0.295 0.199 0.080 4.333 0.787 0.364 4.99 4.69 3.0 -13.29 20.56 11.46
      B07 110°55′37″ 24°38′07″ 7.50 18.9 202 0.041 0.123 0.889 0.183 0.100 0.007 2.050 0.413 0.465 2.31 2.16 3.2 -12.23 0.37 0.19
      B08 110°42′26″ 24°41′22″ 7.44 20.6 485 0.022 0.038 2.080 0.783 0.150 0.104 5.079 0.695 0.334 5.79 5.44 3.1 -14.03 19.86 11.02
      B09 110°26′58″ 24°58′55″ 7.56 20.7 454 0.011 0.016 2.376 0.361 0.125 0.107 4.846 0.713 0.300 5.50 5.18 3.0 -15.03 20.04 11.14
      B10 110°56′53″ 25°10′43″ 7.67 16.8 217 0.000 0.029 0.995 0.276 0.100 0.087 2.190 0.450 0.452 2.57 2.46 2.1 -11.53 21.49 12.04
      B11 110°20′12″ 24°24′37″ 8.06 18.7 232 0.019 0.033 1.020 0.322 0.125 0.139 2.004 0.657 0.645 2.74 2.41 6.4 -12.41 45.62 29.55
      B12 110°22′33″ 24°24′26″ 7.45 18.4 422 0.030 0.056 1.822 0.568 0.199 0.213 3.774 1.116 0.613 4.87 4.40 5.0 -11.59 39.14 24.33
      B13 110°24′19″ 24°47′36″ 7.77 19.5 441 0.015 0.036 1.957 0.634 0.224 0.146 4.403 0.638 0.326 5.23 4.92 3.1 -13.16 27.10 15.67
      B14 110°33′48″ 24°54′31″ 7.79 17.1 402 0.009 0.019 1.619 0.799 0.125 0.067 4.380 0.782 0.483 4.86 4.64 2.4 -13.53 15.48 8.39
      B15 110°27′07″ 25°03′07″ 8.21 16.6 301 0.015 0.027 1.562 0.162 0.125 0.087 2.982 0.680 0.436 3.49 3.28 3.1 -12.77 22.47 12.66
      下载: 导出CSV

      表  2  不同溶蚀条件下HCO3-所占比例

      Table  2.   Proportion of HCO3- in different corrosion conditions

      溶蚀条件 H2SO4溶蚀比例(%) HCO3-H2SO4(%) HCO3-H2CO3(%) HCO3土壤大气(%)-
      硫酸、碳酸溶蚀碳酸盐岩 22.64 13.04 86.96 43.48
      碳酸溶蚀碳酸盐岩 0 0 100.00 50.00
      下载: 导出CSV
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    • 收稿日期:  2014-12-06
    • 刊出日期:  2015-07-15

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