Litterfall 15N abundance indicates declining soil nitrogen availability in a free-air CO2 enrichment experiment
https://esajournals.onlinelibrary.wiley.com/doi/full/10.1890/10-0293.1
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- Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability
https://nph.onlinelibrary.wiley.com/doi/full/10.1111/j.1469-8137.2009.02917.x
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https://link.springer.com/article/10.1007/s00442-008-1028-8