For example, once a tree has essentially as much CO2 as it can use, other conditions such as soil nitrogen availability, will become limiting. (realclimate.org)
The landscape's productivity is limited by nitrogen availability. (sciencedaily.com)
Treat CC, Wollheim W, M., Varner R, K., Bowden W, B. (2016) Longer thaw seasons increase nitrogen availability for leaching during fall in tundra soils. (searcharcticscience.org)