Foliar δ15N values characterize soil N cycling and reflect nitrate or ammonium preference of plants along a temperate grassland gradient
https://link.springer.com/article/10.1007/s00442-008-1028-8
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- 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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- Leaf δ15N as a physiological indicator of the responsiveness of N2-fixing alfalfa plants to elevated [CO2], temperature and low water availability
https://www.frontiersin.org/articles/10.3389/fpls.2015.00574/full