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首页> 外文会议>International Symposium on Water-Rock Interaction >Anthropogenic N - A global issue examined at regional scale from soils, to fungi, roots and tree rings
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Anthropogenic N - A global issue examined at regional scale from soils, to fungi, roots and tree rings

机译：人类学N - 在土壤的区域规模上检查全球问题，对真菌，根和树戒指

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摘要

Globally increasing anthropogenic airborne emissions of reactive nitrogen (N) generate several environmental issues that require investigating how N accumulation modifies the N cycle. Tree-ring δ~(15)N series may help understanding past and current perturbations in the forest N cycle. Although several studies have addressed this issue, most of them were of local scale or based on short δ~(15)N series. The development of this environmental indicator however would benefit from examining, at the regional scale, the relationships of long tree-ring series with soil N biogeochemical processes. Here we explore these links for tree stands of the oil-sands region in northern Alberta, and the coal-fired power plants region in central Alberta, Canada. We characterize the tree-ring δ~(15)N trends, the N modification rates and bacterial and fungal communities of soil samples collected in the immediate surrounding of the characterized trees. The dataset suggests that specific soil pH, and N-cycling bacterial and fungal communities influence tree-ring δ~(15)N responses to anthropogenic emissions, correlating either directly or inversely. Overall, tree-ring δ~(15)N series may record changes in the forest-N cycle, but their interpretation requires understanding key soil biogeochemical processes. 《In nature nothing exists alone》, Rachel Carson.
机译：全球增加的反应氮（n）的人为空气载发射产生几个环境问题，需要调查N累积修改N个循环的初始问题。树环δ〜（15）n系列可以帮助了解森林N循环中的过去和当前扰动。虽然有几项研究已经解决了这个问题，但大多数都是局部规模或基于短δ〜（15）n系列。然而，这种环境指标的发展将受益于在区域规模上审查长树林系列与土壤中的生物地球化学过程的关系。在这里，我们探索了艾伯塔北部石油沙滩地区的树立的这些链接，以及加拿大艾伯塔省中部的燃煤电厂区。我们在特征树木周围收集的土壤样品的氮素样本和细菌和真菌社区的趋势表征了树木δ〜（15）次趋势。该数据集表明，特定的土壤pH和N循环细菌和真菌社区影响树木δ〜（15）n对人为排放的反应，直接或成反比地关联。总的来说，树环δ〜（15）n系列可能会记录森林-N循环中的变化，但它们的解释需要了解关键土壤生物地球化学过程。 “在大自然中，没有人只存在”，雷切尔卡森。

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