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冰川冻土 ›› 2019, Vol. 41 ›› Issue (5): 1044-1052.doi: 10.7522/j.issn.1000-0240.2019.1154

• 冰川与冰冻圈水文 • 上一篇    下一篇

祁连山北坡稳定同位素生态水文学研究的初步进展与成果应用

李宗省, 冯起, 李宗杰, 吕越敏, 袁瑞丰, 桂娟, 李永格, 张百娟, 薛健   

  1. 中国科学院 西北生态环境资源研究院 内陆河流域生态水文重点实验室/甘肃省祁连山生态环境研究中心, 甘肃 兰州 730000
  • 收稿日期:2019-07-08 修回日期:2019-09-02 出版日期:2019-10-25 发布日期:2020-02-24
  • 作者简介:李宗省(1984-),男,甘肃会宁人,副研究员,2012年在中国科学院寒区旱区环境与工程研究所获博士学位,从事寒区同位素生态水文研究.E-mail:lizxhhs@163.com
  • 基金资助:
    国家重点研发计划项目(2019YFC0507401);国家"万人计划"青年拔尖人才项目(李宗省);中国科学院青年创新促进会优秀会员项目(2013274);黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG1814)资助

Ecohydrology based on stable isotope tracing in the northern Qilian Mountains: preliminary progress and its applications

LI Zongxing, FENG Qi, LI Zongjie, Lü Yuemin, YUAN Ruifeng, GUI Juan, LI Yongge, ZHANG Baijuan, XUE Jian   

  1. Key Laboratory of Ecohydrology of Inland River Basin/Gansu Qilian Mountains Ecology Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2019-07-08 Revised:2019-09-02 Online:2019-10-25 Published:2020-02-24

摘要: 2012年以来祁连山北坡稳定同位素生态水文学研究的初步进展包括:(1)云下蒸发和水汽再循环是降水稳定同位素演化的重要因子;(2)各水体稳定同位素年内变化指示了地表水和地下水的不同转化模态;(3)海拔2 000 m以上山区水汽再循环贡献了约24%的降水;(4)冰雪冻土带贡献了出山径流的80%左右。上述结果为祁连山国家公园范围区划和生态保护提供了科技支撑。

关键词: 祁连山, 生态水文, 内陆河流域, 稳定同位素示踪

Abstract: This study has analyzed preliminary progress in the study of stable isotope ecohydrology based on systematic observation and continuous sampling in the northern slopes of the Qilian Mountains since 2012. The results showed that:sub-cloud evaporation and water vapor recycling are important for the evolution mechanisms of stable isotope of precipitation in the study area. When precipitation is higher, sub-cloud evaporation of falling raindrops will be lower and enrichment of δ18O is weaker. Therefore, rainfall events with higher precipitation amounts had more depleted δ18O and vice versa. The stable isotope of river and groundwater is stable within the year, contrast with the significant annual fluctuation in precipitation stable isotopes, which reflects the transformation from snow melt water to groundwater in glacier terminus, from supra-permafrost water to surface water in permafrost regions, and repeated transformation of surface water and groundwater in vegetation zone. Under the background of climate warming, with the intensification of evapotranspiration in alpine regions, water vapor recycling is gradually accelerating, which becomes the main transformation from gaseous water to liquid water. Meanwhile, it is an important component of water vapor source for regional precipitation. Water vapor recycling contributes about 24% of precipitation in mountainous regions above 2 000 m a.s.l. About 4/5 of the runoff is recharged in the cryosphere belt above 3 600 m a.s.l. in the northern slopes of the Qilian Mountains. The contribution of atmospheric precipitation, supra-permafrost water and glacier and snow meltwater to runoff in the outlet is 70%, 22% and 8%, respectively. The Qilian Mountains National Park is located in 95°-103.5°E, 36.8°-39.6°N, with a total area of 4.8×104 km2 (accounting for 27% of the total area of the Qilian Mountains). This result has clarified the hydrological process indicated by stable isotopes in the inland river basins under the background of climate warming and intense cryosphere ablation, provided a new basis to measure the strengthening of water vapor recycling in alpine regions, quantified the contribution ratio of water vapor recycling precipitation, and proved the fact that the contribution ratio of cryospheric meltwater to runoff variations. In particular, it has provided scientific support and technical guidance for establishing the Qilian Mountains National Park.

Key words: Qilian Mountains, ecohydrology, inland river basin, stable isotope tracing

中图分类号: 

  • P641.3