受流域水文功能连接影响的氮动态迁移过程

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2024-10-28 DOI:10.1016/j.jhydrol.2024.132218

Ming Lei , Yu Long , Taoxi Li , Yichun Ma , Guangjie Zhang , Bo Peng , Zhongwu Li , Yaojun Liu

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引用次数: 0

摘要

氮（N）污染是流域非点污染的主要类型。在不同降雨条件下，流域水文连通性在很大程度上控制着氮迁移过程。水文连通性的变化受极端降雨事件的控制，导致动态氮迁移的响应机制更加不确定。在本研究中，根据对一个小流域的长期定位监测，采用高频率采样，选取了四个典型降雨事件（持续时间长的降雨事件 E1、E2；持续时间短的降雨事件 E3、E4）。描述不同类型降雨事件下水文连通性的时空变化特征。揭示水文连通性如何影响氮动态过程。结果表明，受降雨事件影响，长时间降雨事件的水文功能连通性优于短时间降雨事件（E1、E2：4.58、5.5；E3、E4：5.25、5.18）。水文连通性的差异不仅使长时间降雨事件下的氮浓度平均负荷和峰值负荷高于短时间降雨事件下的氮浓度平均负荷和峰值负荷。这也导致了氮源组成的不同，土壤氮（SN）和粪便污水氮（M&S）是长历时降雨事件下的主要氮源（SN：28.3%，25.5%；M&S：41%，53%），而 M&S 则是短历时降雨事件下的主要氮源（37%，67%）。除了降雨事件影响流域水文连通性外，先兆降水指数（API）也制约着水文功能连通性的开始时间。流域的景观特征也影响了水文连通性的时空特征，从而形成了流域的氮源-汇转换关系。基于不同降雨事件下氮迁移特征对水文连通性的响应差异。考虑水文连通性维度和干预措施有助于实现流域氮的精确管理。

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Nitrogen dynamic transport processes shaped by watershed hydrological functional connectivity

Nitrogen (N) pollution is the major type of non-point pollution in watersheds. The nitrogen transport process is significantly controlled by the watershed hydrological connectivity under different rainfall conditions. Changes in hydrological connectivity were controlled by extreme rainfall events, resulting in a more uncertain response mechanism for dynamic nitrogen transport. In this study, four typical rainfall events were selected based on long-term positional monitoring of a small watershed using high-frequency sampling (long duration rainfall events E1, E2; short duration rainfall events E3, E4). Characterizing spatial and temporal changes in hydrological connectivity under different types of rainfall events. Revealing how hydrological connectivity shape the nitrogen dynamic processes. The results showed that the hydrological functional connectivity was better for long duration rainfall events than for short duration rainfall events as influenced by rainfall events (E1, E2: 4.58, 5.5; E3, E4: 5.25, 5.18). The difference in hydrological connectivity not only made the average and peak nitrogen concentration load under the long duration rainfall events higher than that under the short duration rainfall events. It also resulted in different nitrogen source composition, with soil nitrogen (SN) and manure & sewage (M&S) being the main sources under long duration rainfall events (SN: 28.3%, 25.5%; M&S: 41%, 53%), whereas M&S dominated under short duration rainfall events (37%, 67%). The antecedent precipitation index (API) also constrained the timing of onset of hydrological functional connectivity, in addition to rainfall events influencing watershed hydrological connectivity. The landscape characteristics of the watershed also affected the spatial and temporal characteristics of hydrological connectivity, which shaped the nitrogen source-sink transition relationship in the watershed. Based on the differences in the response of nitrogen transport characteristics to hydrological connectivity under different rainfall events. Considering hydrological connectivity dimensions and intervention can help to achieve precise management of nitrogen in the watershed.

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.