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The Fates of Nitrogen in an Experimental Wetland Food Web: a Stable Isotope Study

机译：实验性湿地食物网中氮的命运：稳定的同位素研究

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Human activities have increased the availability of reactive nitrogen in many freshwater ecosystems, leading to negative impacts on the health and biodiversity of lakes, rivers and wetlands. Yet, understanding the pathways of nutrient cycling in wetlands is limited. We conducted a nitrogen stable isotope (N-15) tracer study to assess nitrogenous nutrient transfers within the biota community in a small experimental wetland between August 13, 2016, and September 12, 2016using a. Results showed rapid use of nitrogen by various aquatic plants and subsequent transfer to the consumer community. N-15 enrichments were found in all plant samples from the first collection event. The fastest nutrient uptake was found in the simplest form of plants (periphyton and Lemna minor), followed by submerged macrophytes (Ceratophyllum demersum and Utricularia vulgaris). Emergent plants displayed the lowest N-15 enrichment, likely due to their inability to directly assimilate nutrients from the water column and their initial large biomass. N-15 enrichments in consumers were also pronounced, indicating that the nitrogen added to the wetland surface water was quickly transferred to various trophic levels. Primary consumers were more strongly labeled than secondary consumers; water column feeders were typically more enriched in N-15 than benthic consumers. This experiment revealed different uses of nitrogen among the plant and consumer communities, and the results may provide useful information on community secession and ecosystem restoration under anthropogenic influence.
机译：人类活动增加了许多淡水生态系统中活性氮的供应，从而对湖泊，河流和湿地的健康和生物多样性产生了负面影响。但是，了解湿地养分循环的途径是有限的。我们进行了氮稳定同位素（N-15）示踪剂研究，以评估2016年8月13日至2016年9月12日之间在小型实验性湿地中生物群落中氮的养分迁移情况，方法如下：结果显示各种水生植物对氮的快速利用并随后转移到消费者社区。从第一次收集事件开始，在所有植物样品中发现了N-15富集。在最简单的植物中（最快的附生植物和小Lemna）发现了最快的养分吸收，其次是被淹没的大型植物（Ceratophyllum demersum和Utricularia Vulgaris）。新兴植物显示出最低的N-15富集水平，这可能是由于它们无法直接吸收水柱中的养分和最初的大量生物量。消费者中的N-15富集也很明显，表明向湿地表层水中添加的氮迅速转移到各种营养水平。主要消费者的标签比次要消费者的标签更强。与底栖生物相比，水柱饲养者通常在N-15中含量更高。该实验揭示了植物群落和消费者群落中氮的不同用法，其结果可能提供有关人为因素影响下的群落分裂和生态系统恢复的有用信息。

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