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首页> 外文期刊>Environmental Pollution >Use of ~(15)N-labelled nitrogen deposition to quantify the source of nitrogen in runoff at a coniferous-forested catchment at Gardsjoen, Sweden
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Use of ~(15)N-labelled nitrogen deposition to quantify the source of nitrogen in runoff at a coniferous-forested catchment at Gardsjoen, Sweden

机译：使用〜（15）N标记的氮沉积来定量瑞典Gardsjoen针叶林流域径流中的氮源

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摘要

To determine the source of dissolved inorganic nitrogen (N) in runoff, approx. 35 kg N enriched with the stable isotope ~(15)N (2110 per thousand δ~(15)N) was added to a mature coniferous forested catchment for one whole year. The total N input was approx. 50 kg ha~(-1) year~(-1). The enrichment study was part of a long-term whole-catchment ammonium nitrate addition experiment at Gardsjoen, Sweden. The ~(15)N concentrations in precipitation, throughfall, runoff and upper forest floor were measured prior to, during, and 3-9 years following the ~(15)N addition. During the year of the ~(15)N addition the δ~(15)N level in runoff largely reflected the level in incoming N, indicating that the leached NO_3~- came predominantly from precipitation. Only 1.1% of the incoming N was lost during the year of the tracer addition. The cumulative loss of tracer N over a 10-year period was only 3.9% as DIN and 1.1% as DON.
机译：要确定径流中溶解的无机氮（N）的来源，请大约。将35 kg富含稳定同位素〜（15）N的N（每千个δ〜（15）N 2110）添加一整年。总N输入约为。 50公斤ha〜（-1）年〜（-1）。浓缩研究是瑞典Gardsjoen一项长期全集水硝酸铵添加实验的一部分。在添加〜（15）N之前，之中和之后的3至9年中，测量了降水，穿透降雨，径流和林上部的〜（15）N浓度。在〜（15）N添加的年中，径流中的δ〜（15）N含量在很大程度上反映了入氮量，表明淋溶NO_3〜-主要来自降水。在添加示踪剂的那一年，仅损失了传入N的1.1％。示踪剂N在10年中的累积损失仅为DIN的3.9％和DON的1.1％。

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