Terrestrial Phosphorus Cycling: Responses to Climatic Change
Duncan N. L. Menge, Sian Kou‐Giesbrecht, Benton N. Taylor, Palani R. Akana, Ayanna Butler, K. A. Carreras Pereira, Savannah Cooley, Vanessa M. Lau, Emma L. Lauterbach
Abstract
Phosphorus (P) limits productivity in many ecosystems and has the potential to constrain the global carbon sink. The magnitude of these effects depends on how climate change and rising CO 2 affect P cycling. Some effects are well established. First, P limitation often constrains CO 2 fertilization, and rising CO 2 often exacerbates P limitation. Second, P limitation and P constraints to CO 2 fertilization are more common in warmer and wetter sites. Models that couple P cycling to vegetation generally capture these outcomes. However, due largely to differences between short-term and long-term dynamics, the patterns observed across climatic gradients do not necessarily indicate how climate change over years to decades will modify P limitation. These annual-to-decadal effects are not well understood. Furthermore, even for the well-understood patterns, much remains to be learned about the quantitative details, mechanisms, and drivers of variability. The interface between empirical and modeling work is particularly ripe for development.