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粤北水边河流域钙元素迁移的基岩制约作用

涂旭 魏兴琥 曾发明

涂 旭,魏兴琥,曾发明. 粤北水边河流域钙元素迁移的基岩制约作用[J]. 中国岩溶,2024,43(1):105-113 doi: 10.11932/karst2023y036
引用本文: 涂 旭,魏兴琥,曾发明. 粤北水边河流域钙元素迁移的基岩制约作用[J]. 中国岩溶,2024,43(1):105-113 doi: 10.11932/karst2023y036
TU Xu, WEI Xinghu, ZENG Faming. Restriction of bedrock to calcium ion migration in the Shuibian river basin of northern Guangdong Province[J]. CARSOLOGICA SINICA, 2024, 43(1): 105-113. doi: 10.11932/karst2023y036
Citation: TU Xu, WEI Xinghu, ZENG Faming. Restriction of bedrock to calcium ion migration in the Shuibian river basin of northern Guangdong Province[J]. CARSOLOGICA SINICA, 2024, 43(1): 105-113. doi: 10.11932/karst2023y036

粤北水边河流域钙元素迁移的基岩制约作用

doi: 10.11932/karst2023y036
基金项目: 国家自然科学基金项目(42007177,41571091)
详细信息
    作者简介:

    涂旭(1994-),硕士研究生,从事农业环境研究。E-mail:tuxu1201@126.com。

    通讯作者:

    曾发明(1987-),讲师,硕士研究生导师,从事岩溶环境钙碳循环研究。E-mail:famingzeng@fosu.edu.cn。

  • 中图分类号: P342

Restriction of bedrock to calcium ion migration in the Shuibian river basin of northern Guangdong Province

  • 摘要: 岩石风化是控制流域水体水化学特征的关键因素之一。为探索岩溶流域中不同基岩风化作用对地表水化学的影响,本文选择粤北典型岩溶流域(水边河)为研究对象,以水体[Ca2+]变化和钙迁移机制为研究主线,通过连续5年的系统调查及采样分析,揭示不同岩性风化对干流水体中Ca2+输送通量的贡献率和岩溶流域钙元素迁移的影响机理。结果表明:(1)不同基岩支流的水体[Ca2+]差异明显,特别是在干季,碳酸盐岩支流水体的[Ca2+]分别是花岗岩、砂岩和砾岩支流的3.8倍、4.7倍、14.9倍;(2)不同基岩支流汇入干流后,水化学变化具有滞后性,并且呈现季节性差异。其中,碳酸盐岩支流汇入后,干流水体的[Ca2+]会滞后升高,而其他支流会稀释[Ca2+],产生稀释作用,其效果在湿季比干季更明显;(3)通过统计分析得出,碳酸盐岩支流在流域土地面积占比为28%,而其对流域水体中[Ca2+]的贡献率达到83%,说明岩溶流域中碳酸盐岩的风化的制约着钙元素的迁移过程;(4)2016—2020年间,水边河向连江输送的钙通量平均值为7.2×104 t·a−1,其中,湿季平均输送量为5.8×104 t·a−1,干季平均为1.4×104 t·a−1;但岩溶水体中钙元素迁移不仅仅有水体溶解的Ca2+,还有沉积态钙迁移和水生生物的钙迁移过程,而农业活动及酸雨等过程可导致水体中[Ca2+]发生明显变化,因此,农业活动和酸雨等对钙迁移的影响需要多加关注。

     

  • 图  1  水边河流域基岩类型及其分布情况

    Figure  1.  Types and distributions of bedrock in the Shuibian river basin

    图  2  不同基岩支流[Ca2+](mg·L−1)干湿季差异

    Figure  2.  Differences of [Ca2+]( mg·L−1) in the tributaries with different types of bedrock during the dry season and the rainy season

    图  3  2016—2020年水边河干流水体中Ca2+浓度的季节性变化

    Figure  3.  Variation of [Ca2+] in the mainstream of Shuibian river between 2016 and 2020

    图  4  水边河流域钙迁移和沉积的概念模型

    Figure  4.  Conceptual model of calcium migration and deposition in Shuibian river basin

    表  1  水边河流域各类岩石汇流面积统计与地貌类型

    Table  1.   Area and landform of different types of bedrock in the Shuibian river basin

    基岩
    类型
    汇流面
    积/km2
    占流域面
    积比/%
    地形
    地貌
    花岗岩15217山地、丘陵
    石灰岩23628峰丛洼地和峰林平原
    砾岩10112山地
    砂岩36843山地和丘陵
    合计857100
    下载: 导出CSV

    表  2  典型支流与干流汇合前后水体中[Ca2+]的变化(mg·L−1

    Table  2.   Changes in [Ca2+] (mg·L−1) before and after the convergence of the tributaries with different types of bedrock into the mainstream

    季节样点位置灰岩支流(T3)砾岩支流(T1)砂岩支流(T7)花岗岩支流(T4)连江干流(L01-L02)
    干季干流a50.5±4.248.9±9.332.6±13.435.3±15.433.2±1.7
    支流a53.2±6.23.6±1.711.9±12.013.9±8.420.6±4.8
    干流b51.1±4.938.8±4.331.4±15.628.2±13.432.2±2.4
    湿季干流a40.6±8.951.7±12.236.0±9.433.3±9.534.4±2.9
    支流a51.4±5.04.64±5.012.3±13.419.5±8.821.0±5.7
    干流b44.4±7.839.1±4.629.2±2.924.1±6.729.6±2.9
    a:代表采样点位于支流或干流在交汇前的上游;b:代表采样点位于支流与干流交汇后的下游干流处。
    a: the sampling points located in the upstream before the convergence of tributaries into the mainstream; b: the sampling points located in the downstream mainstream after the convergence of tributaries into the mainstream.
    下载: 导出CSV

    表  3  水边河2016—2020年钙离子输送量的季节性变化

    Table  3.   Seasonal variations of calcium ion transport in the Shuibian river between 2016 and 2020

    时间降雨量
    /mm
    Ca2+
    /mg·L−1
    沙坝最大流
    量/ms−1
    输送量
    /万t
    2016年干季646.015.387.71.8
    2016年湿季1 904.519.3308.311.0
    2017年干季238.022.436.31.0
    2017年湿季1 577.019.386.93.1
    2018年干季356.026.153.51.8
    2018年湿季1 407.518.580.62.6
    2019年干季137.028.028.61.0
    2019年湿季1 832.024.1167.57.5
    2020年干季297.516.948.61.1
    2020年湿季1 617.517.3138.54.4
    下载: 导出CSV
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  • 收稿日期:  2022-11-25
  • 录用日期:  2023-07-17
  • 修回日期:  2023-07-01
  • 网络出版日期:  2024-03-21
  • 刊出日期:  2024-02-01

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