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首页> 外文期刊>Environmental Science & Technology >Total Nitrogen Content And δ~(15)n Signatures In Moss Tissue: Indicative Value For Nitrogen Deposition Patterns And Source Allocation On A Nationwide Scale
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Total Nitrogen Content And δ~(15)n Signatures In Moss Tissue: Indicative Value For Nitrogen Deposition Patterns And Source Allocation On A Nationwide Scale

机译：苔藓组织中的总氮含量和δ〜（15）n特征：在全国范围内氮沉积模式和源分配的指示值

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摘要

To evaluate a new N-monitoring program in the framework of the UN-ECE ICP-Vegetation program using mosses as bioindicators, 490 moss samples were collected at 220 sites in Austria and analyzed for total N (N content) and δ~(15)N signatures. Within-site variability of N content and δ~(15)N signatures was tested for the first time on a large scale and was extremely low compared to between-site variability. N content in moss tissue ranged between 0.76% and 1.99% and δ~(15)N signatures between -10.04 and -2.45. Altitude was significantly correlated with N content (P = 0.021) and δ~(15)N signatures (P < 0.001). When comparing moss data to deposition data from 35 measurement sites, significant correlations between N content and N deposition [P = 0.014) were found. Increasing δ~(15)N signatures provided evidence for a change in N source and its respective isotopic composition with altitude, e.g., due to longdistance transport of reactive N or as a result of changes in the wet:dry deposition ratio. Our study underlines that N deposition can generally be estimated by N content in mosses on a large scale, but that this approach has certain limitations, especially in areas with large differences in altitude and precipitation.
机译：为了在UN-ECE ICP-Vesgetation计划的框架内使用苔藓作为生物指示剂评估新的N监测计划，在奥地利的220个地点收集了490个苔藓样本，并分析了总N（N含量）和δ〜（15） N个签名。 N含量和δ〜（15）N标记的位点内变异性是首次大规模测试，与位点间变异性相比极低。苔藓组织中的N含量在0.76％至1.99％之间，δ〜（15）N特征在-10.04至-2.45之间。海拔高度与氮含量（P = 0.021）和δ〜（15）N信号显着相关（P <0.001）。将苔藓数据与来自35个测量站点的沉积数据进行比较时，发现N含量与N沉积之间存在显着相关性[P = 0.014）。 δ〜（15）N标记的增加为氮源及其相应同位素组成随海拔的变化提供了证据，例如由于反应性N的长距离传输或由于干湿沉积比的变化所致。我们的研究强调，大体上可以通过苔藓中的N含量来估算N的沉积，但是这种方法有一定的局限性，尤其是在海拔和降水量差异较大的地区。

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