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. 2014 May 16;5:205. doi: 10.3389/fpls.2014.00205

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Copyright © 2014 McCormack and Guo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Conceptual example of how equivalent additions of the same resource (e.g., irrigation or N fertilization) could result in observed increases, decreases, and no change in fine root lifespan depending on background resource availability or other site characteristics. Site 2 represents average background resource availability and soil conditions. Site 1 is low in resource availability and would see an increase in root lifespan with an increase in a given resource while lifespan decreases in Site 3 where resource availability has exceeded plant demand and the buffering capacity of soils (e.g., anoxia or decreasing soil pH).