The age and sources of stream water in a boreal forest watershed in the permafrost region: a case study of a watershed in northeast China
The age and sources of stream water in a boreal forest watershed in the permafrost region: a case study of a watershed in northeast China
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DOI：
10.3389/feart.2023.1225291
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发表时间：
2023-12
影响因子：
2.9
通讯作者：
Xiang Xiao;Tijiu Cai;Liangliang Duan
中科院分区：
文献类型：
--
作者：
Xiang Xiao;Tijiu Cai;Liangliang Duan
确定水流的年龄和来源对于理解流域水文过程和生物地球化学循环至关重要。本研究利用2019年6 - 10月中国东北多年冻土区老叶岭（LYL）流域日降水和径流同位素数据以及连续监测的电导率数据，分别采用同位素水文分离（IHS）和电导率质量平衡（CMB）两种独立的方法对径流组分进行分离。结果表明：大兴安岭冻土带北带森林流域的河流水主要由事前水组成；虽然IHS方法比CMB方法更敏感，提供更多的细节，但两种方法的结果呈现相似的趋势。龄期小于65 d的幼水馏分（Fyw）平均值为5.6%，平均穿越时间（MTT）为3.33年。这些发现增强了我们对多年冻土区产流机制的基本特征和径流组分变化的理解。这些知识对于气候变化背景下有效的区域水资源管理至关重要，如水利设施的建设和水旱灾害的预测。
Determining the age and sources of stream water is critical for understanding the watershed hydrological processes and biogeochemical cycle. In this study, daily isotope data of rainfall and runoff, as well as continuously monitored conductivity data from June to October in 2019 in-Laoyeling(LYL) watershed located in permafrost region of northeastern China were used to separate streamflow components through the application of two independent methods: isotope-based hydrograph separations (IHS) and the conductivity mass balance (CMB) methods. The results showed that stream water in a boreal forest watershed with permafrost of the Daxing’an Mountains is mainly composed of pre-event water. Although the IHS method is more sensitive and provides more details than the CMB method, the results of both methods show a similar trend. The average value of the young water fractions (Fyw) for those aged less than 65 days is 5.6%, while the mean transit time (MTT) was calculated to be 3.33 years. These findings enhance our understanding of the fundamental characteristics of runoff generation mechanisms and changes in runoff components in permafrost regions. Such knowledge is crucial for effective regional water resource management under the context of climate change, such as construction of water conservancy facilities and prediction of flood and drought disasters.