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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.

Anthropogenic N – A global issue examined at regional scale from soils, to fungi, roots and tree rings