Fig. 1: The relationships between plant/soil nitrogen and mean annual temperature.
From: Global plant nitrogen use is controlled by temperature
The relationship between δ15N of various components (e.g., plant leaves, stems, roots, soil ammonium, nitrate, and organic nitrogen) and mean annual temperature (not to scale) (A). The proportion of plant use of ammonium, nitrate and organic nitrogen (not to scale) with increasing temperature (B). The results are from Hu et al.6.
