Application of δ15N to trace the impact of penguin guano on terrestrial and aquatic nitrogen cycles in Victoria Land, Ross Sea region, Antarctica
Application of δ15N to trace the impact of penguin guano on terrestrial and aquatic nitrogen cycles in Victoria Land, Ross Sea region, Antarctica
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应用 δ15N 追踪企鹅粪便对南极洲罗斯海地区维多利亚地陆地和水生氮循环的影响
DOI：
10.1016/j.scitotenv.2019.134496
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发表时间：
2020
影响因子：
9.8
通讯作者：
Steven D. Emslie
中科院分区：
文献类型：
--
作者：
Wang Xueying;Liu Xiaodong;Fang Yunting;Jin Jing;Wu Libin;Fu Pingqing;Huang Huihui;Zhang Huijun;Steven D. Emslie
南极洲的企鹅群落为研究生态系统功能和氮(N)循环提供了理想的“自然实验室”。本研究评估了企鹅海鸟粪氮的空间分布，并定量评估了其对南极罗斯海地区维多利亚陆地植物氮素利用策略的影响。在一个活跃的Adélie企鹅(Pygocelis Adeliae)群落内外采集了土壤、苔藓和水生微生物垫，并分析了总氮和无机氮(NH4+-N和NO3-δ-N)的−15N。鸟粪影响区土壤全氮(TN)、NH4+-N和NO3-−-N浓度及其δ15N值均显著高于非鸟粪区，说明鸟粪是企鹅群落及其附近的重要氮源。然而，即使远离企鹅群落，土壤δ15N值也与企鹅群落相似，表明企鹅来源的N具有强烈的空间影响。受鸟粪影响的苔藓在δ15N中的丰度高于无鸟粪地区。苔藓覆盖土壤中NH_4~+-N和NO_3~(3-)−-N的δ~(15)N值表明，在没有鸟粪的情况下，苔藓可能偏爱无机氮，而溶解的有机氮将成为苔藓在造山运动土壤上生长的重要来源。企鹅群落附近的水生微生物垫样品富含15N，而旱地则是亏损的。
Penguin colonies in Antarctica offer an ideal “natural laboratory” to investigate ecosystem function and the nitrogen (N) cycle. This study assessed the spatial distribution of penguin-derived N from guano and quantitatively assessed its impact on plant N utilization strategies in Victoria Land, Ross Sea region, Antarctica. Soil, moss, and aquatic microbial mats were collected inside and outside an active Adélie penguin (Pygoscelis adeliae) colony and analyzed for δ15N of total and inorganic nitrogen (NH4+-N and NO3−-N). The soil total nitrogen (TN), NH4+-N, and NO3−-N concentrations, as well as their δ15N values were significantly higher in guano-impacted areas than those in guano-free areas, verifying that guano is an important N source at and near penguin colonies. However, even far from the penguin colonies, soil δ15N values resembled those in penguin colonies, suggesting strong spatial impacts of penguin-derived N. The moss impacted by guano was more enriched in δ15N than in guano-free areas. The δ15N values of NH4+-N and NO3−-N in soils covered with moss revealed that the moss might prefer inorganic N in the absence of guano, while the dissolved organic N would become an important source for moss growing on ornithogenic soils. Aquatic microbial mat samples near penguin colonies were15N-enriched, but15N-depleted at upland sites.