The import and export of organic nitrogen species at a Scottish ombrotrophic peatland
The import and export of organic nitrogen species at a Scottish ombrotrophic peatland
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DOI：
10.5194/bg-13-2353-2016
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发表时间：
2015-01
期刊：
影响因子：
4.9
通讯作者：
R. Mckenzie;M. Z. Ozel;J. Cape;J. Drewer;K. Dinsmore;E. Nemitz;Y. S. Tang;N. Dijk;M. Anderson;J. Hamilton;M. Sutton;M. Gallagher;U. Skiba
中科院分区：
文献类型：
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作者：
R. Mckenzie;M. Z. Ozel;J. Cape;J. Drewer;K. Dinsmore;E. Nemitz;Y. S. Tang;N. Dijk;M. Anderson;J. Hamilton;M. Sutton;M. Gallagher;U. Skiba
抽象。溶解有机氮（DON）的贡献显着的总氮收支，但不是常规测量降水或溪流。为了调查DON的沉积和输出的N，降水，流和土壤水样品收集的湿泥炭地和DON超过2年的时间进行了分析。在湿沉降中，DON占总溶解氮（TDN）的10%，是土壤水（99%）和河水（75%）中最主要的组分。NH 4+是降水中最主要的N形态，NO3-对降水、土壤水和溪流水的贡献最小。采用C18固相萃取柱捕集后，用二维气相色谱-氮化学发光检测器（GC × GC-NCD）对降水和水流中的DON进行定性分析。检测到10种独特的化合物，其中5种被鉴定为吡咯、苄腈、十二胺、N-亚硝基二丙胺和癸胺。五种化合物都存在于沉淀和流样品：吡咯，苯甲腈和三个身份不明的化合物。SPE提取效率为DON是非常低的（11%），但与改进DON形态可以成为一个有价值的工具，提供有关其来源和途径的信息，并告知化学运输模型。
Abstract. Dissolved organic nitrogen (DON) contributes significantly to the overall nitrogen budget, but is not routinely measured in precipitation or stream water. In order to investigate the contribution of DON to the deposition and export of N, precipitation, stream and soil water samples were collected from an ombrotrophic peatland and analysed for DON over a 2-year period. In wet-only deposition DON contributed up to 10 % of the total dissolved nitrogen (TDN) and was the most dominant fraction in soil water (99 %) and stream water (75 %). NH4+ was the most dominate form of N in precipitation, with NO3− contributing the least to precipitation, soil water and stream water. Precipitation and stream DON were qualitatively analysed by a two-dimensional gas chromatograph coupled to a nitrogen chemiluminescence detector (GC × GC-NCD) after trapping onto C18 solid phase extraction (SPE) cartridges. Ten unique compounds were detected and five identified as pyrrole, benzonitrile, dodecylamine, N-nitrosodipropylamine and decylamine. Five compounds were present in both precipitation and stream samples: pyrrole, benzonitrile and three unidentified compounds. The SPE-extraction efficiency for DON was very low (11 %), but with improvements DON speciation could become a valuable tool to provide information on its sources and pathways and inform chemical transport models.