Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems

Nitrogen-15 ( 15N) labelled ammonium and nitrate were applied to understory saplings in a low-elevation deciduous forest and a high-elevation coniferous forest during the 1993 growing season to estimate the minimum retention of inorganic N from wet deposition. Tissue samples were collected at both s...

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