基于稳定水同位素和原状土柱的贡嘎山原始森林暴雨入渗过程

叶鑫; 黄美玉; 秦子怡; 朱婉婷; 谢莲; 赵鹏

doi:10.13870/j.cnki.stbcxb.2023.01.028

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基于稳定水同位素和原状土柱的贡嘎山原始森林暴雨入渗过程

更新时间：2025-03-12

- 基于稳定水同位素和原状土柱的贡嘎山原始森林暴雨入渗过程
- Rainstorm Infiltration Process of Primeval Forest of Gongga Mountain Based on Stable Water Isotope and Undisturbed Soil Column
- 水土保持学报 2023年37卷第1期页码：211-219
- 作者机构：
  
  1. 四川农业大学林学院, 长江上游森林资源保育与生态安全国家林业和草原局重点实验室, 水土保持与荒漠化防治省高校重点实验室,成都,611130
  2. 中国科学院地理科学与资源研究所, 陆地水循环及地表过程院重点实验室,北京,100101
  3. 中国科学院大学资源与环境学院,北京,100049
- 作者简介：
  
  [ "叶鑫(1999-),女,在读硕士研究生,主要从事流域水文及同位素水文研究。E-mail:1515103640@qq.com" ]
- 基金信息：
  
  国家自然科学基金项目(42177315)
- DOI：10.13870/j.cnki.stbcxb.2023.01.028
  中图分类号： S157.1
- 纸质出版：2023
- 稿件说明：
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叶鑫, 黄美玉, 秦子怡, 等. 基于稳定水同位素和原状土柱的贡嘎山原始森林暴雨入渗过程[J]. 水土保持学报, 2023,37(1):211-219.

YE Xin, HUANG Meiyu, QIN Ziyi, et al. Rainstorm Infiltration Process of Primeval Forest of Gongga Mountain Based on Stable Water Isotope and Undisturbed Soil Column[J]. 2023, 37(1): 211-219.
叶鑫, 黄美玉, 秦子怡, 等. 基于稳定水同位素和原状土柱的贡嘎山原始森林暴雨入渗过程[J]. 水土保持学报, 2023,37(1):211-219. DOI： 10.13870/j.cnki.stbcxb.2023.01.028.

YE Xin, HUANG Meiyu, QIN Ziyi, et al. Rainstorm Infiltration Process of Primeval Forest of Gongga Mountain Based on Stable Water Isotope and Undisturbed Soil Column[J]. 2023, 37(1): 211-219. DOI： 10.13870/j.cnki.stbcxb.2023.01.028.

摘要

在贡嘎山原始森林不同土壤质地的样地采集制备原状土柱

监测并分析2020年夏季2场暴雨期间入渗出流过程及出流水稳定同位素(δ18O)变化特征。结果表明:(1)海拔2 649 m的富含砾石的粉壤土样地A在8月6日和8月11日次降雨后平均总出流量(分别为4.14

14.61 L)比海拔3 000 m的粉壤土样地B(1.45

11.99 L)大。样地A的出流过程对降雨的响应也更敏感。(2)出流水的同位素变化幅度小于降雨同位素变化幅度

入渗过程中新旧水混合强烈。(3)2个样地出流水来源和运移路径的变化模式存在明显差异。样地A在初始降雨峰值时体现出极高的降雨贡献和快速触发的优先流路径

出流消退中逐步体现活塞流特征;样地B在相对缓慢的入渗过程中以活塞流为主导

新旧水交换程度更高。因此

较高的有机质和砾石含量以及较大雨强有利于优先流产生

优先流和活塞流的产生转变过程对于降雨强度变化有着快速响应

这对于流域的含水层补给和溶质运移等过程可能产生进一步影响。

Abstract

The undisturbed soil columns were collected from different soil texture sample plots in Gongga Mountain primeval forest. The infiltration and outflow process and the stable isotope (δ18O) variation characteristics were monitored and analyzed during two rainstorms in summer of 2020. The results showed that: (1) The average total runoff (4.14 and 14.61 L

respectively) of gravel rich silty loam plot A at low altitude (2 649 m above sea level) after rainfall on August 6th and 11th was larger than that of silty loam sample plot B (3 000 m above sea level) (1.45 and 11.99 L

respectively). The outflow process of plot A was also more sensitive to rainfall. (2) The variation amplitude of isotope in outflow water was smaller than that in rainfall

and the new and old water were strongly mixed in the process of infiltration. (3) There were obvious differences in the variation patterns of the source and migration path of the outflow water between the two plots. Plot A showed extremely high rainfall contribution and fast triggered preferential flow path at the initial rainfall peak

and gradually showed the characteristics of plug flow when the outflow faded. Plot B was dominated by plug flow movement in the relatively slow infiltration process

and the exchange degree of new and old water was higher. Therefore

higher organic matter

gravel content and higher rainfall intensity were beneficial to the generation of preferential flow

and the generation and transformation process of preferential flow and plug flow had a rapid response to the change of rainfall intensity

which might have a further impact on aquifer recharge and solute transport in the basin.

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