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应用生态学报 ›› 2021, Vol. 32 ›› Issue (3): 860-868.doi: 10.13287/j.1001-9332.202103.24

• 研究论文 • 上一篇    下一篇

内蒙古草原巴拉格尔河流域不同水体转化特征及环境驱动因素

房丽晶1, 高瑞忠1*, 贾德彬1, 于瑞宏2,3, 刘心宇2, 刘廷玺1, 王喜喜4   

  1. 1内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018;
    2内蒙古大学生态与环境学院, 呼和浩特 010021;
    3蒙古高原生态学与资源利用教育部重点实验室, 呼和浩特 010021;
    4美国欧道明大学, 诺福克 23529
  • 收稿日期:2020-07-14 接受日期:2020-12-12 出版日期:2021-03-15 发布日期:2021-09-15
  • 通讯作者: * E-mail: ruizhonggao@imau.edu.cn
  • 作者简介:房丽晶, 女, 1996年生, 硕士研究生。主要从事干旱半干旱地区生态水文及水化学特征研究。E-mail: 1329867839@qq.com
  • 基金资助:
    国家自然科学基金项目(51969022)、蒙古高原生态学与资源利用教育部重点实验室开放课题(KF2020006)、内蒙古自然基金项目(2018MS05006)和内蒙古自治区科技计划项目(2019GG141)资助

Characteristics and environmental driving factors of water transformation in the Balaguer River watershed of Inner Mongolia steppe

FANG Li-jing1, GAO Rui-zhong1*, JIA De-bin1, YU Rui-hong2,3, LIU Xin-yu2, LIU Ting-xi1, WANG Xi-xi4   

  1. 1Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
    2Institute of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China;
    3Ministry of Education Key Laboratory of Ecology and Resources Use of the Mongolian Plateau, Hohhot 010021, China;
    4Old Dominion University, Norfolk 23529, Virginia, USA
  • Received:2020-07-14 Accepted:2020-12-12 Online:2021-03-15 Published:2021-09-15
  • Contact: * E-mail: ruizhonggao@imau.edu.cn
  • Supported by:
    National Natural Science Foundation of China (51969022), Open Project of Ministry of Education Key Laboratory of Ecology and Resources Use of the Mongolian Plateau (KF2020006), the Inner Mongolia Natural Science Foundation (2018MS05006), and the Inner Mongolia Science and Technology Project (2019GG141)

摘要: 内蒙古高原草原流域是我国内陆重要的生态屏障,水资源演化对该区域社会经济发展和生态环境保护具有重要意义。本研究选取巴拉格尔河流域为对象,于2018—2019年丰、枯水期采集降水、河水、浅层地下水共254份水样,测定其物理化学指标、δD和δ18O,运用同位素技术、数理统计和反距离权重法分析不同水体中稳定同位素的组成关系、时空变化及其影响因子,并结合氘盈余(d-excess)及同位素混合比公式,揭示不同水体的转换关系,识别其演化的环境驱动因素。结果表明: 研究期间,大气降水、河水、浅层地下水呈现δD、δ18O丰水期高、枯水期低的特征;草原流域不同水体时空转化的主要环境驱动因素为温度、海拔和地下水埋深,地下水δD、δ18O、河水δD与海拔均呈显著负相关;浅层地下水埋深小于10 m时,δD、δ18O变化大,大于10 m时则趋于稳定;大气降水的δ18O与气温呈正相关;丰水期氘盈余值高于枯水期,分布特征存在局部高值,流域自南向北呈减小趋势;丰水期降水对上游河水的补给率超过50%,河水对地下水的补给均在50%以上,在不同河段地表水与地下水的补排关系不同。

关键词: 高原内陆河, 草原流域, 氢氧稳定同位素, 转化关系, 水资源环境

Abstract: Inner Mongolian steppe is one of the ecological barriers in China. The variation of water resources is very important for the development of social-economy and the protection of eco-environment. We collected 254 water samples of precipitation, river, and shadow groundwater during wet-season and dry-season of 2018-2019 from Balaguer River watershed and meansured the physical-chemical indicators, δD and δ18O of water samples. The stable isotope technology, mathematical statistics, and the inverse distance weighting method were used to analyze the stable isotope composition, spatial-temporal variation, and impact factors. Moreover, the d-excess and the isotopic mixing ratio formula were used to analyze the conversion characteristics of different water and to identify their environment driving variables. The results showed that δD and δ18O of precipitation, river and shallow groundwater were higher in wet season than in dry season. The driving factors of different water transformation in the watershed were air temperature, altitude, and groundwater depth. Altitude was significantly negatively correlated with river δD, and the δD and δ18O of groundwater. δD and δ18O of groundwater fluctuated significantly in the area with groundwater depth less than 10 m, but were stable in other areas. There was a positive correlation between precipitation δ18O and air temperature. The d-excess in wet season was higher than that in dry season, with a decreasing distribution characteristic from southern to northern part in the study area. More than 50% river in upper stream came from precipitation, while more than half river water converted to groundwater, with different recharge-drainage relationships existed between surface water and groundwater in different river reaches.

Key words: plateau inland river, steppe watershed, hydrogen and oxygen stable isotopes, conversion relationship, water resource environment