Nutrients and hydrology indicate the driving mechanisms of peatland surface patterning.
Peatland surface patterning motivates studies that identify underlying structuring mechanisms. Theoretical studies so far suggest that different mechanisms may drive similar types of patterning. The long time span associated with peatland surface pattern formation, however, limits possibilities for empirically testing model predictions by field manipulations. Here, we present a model that describes spatial interactions between vegetation, nutrients, hydrology, and peat. We used this model to study pattern formation as driven by three different mechanisms: peat accumulation, water ponding, and nutrient accumulation. By on-and-off switching of each mechanism, we created a full-factorial design to see how these mechanisms affected surface patterning (pattern of vegetation and peat height) and underlying patterns in nutrients and hydrology. Results revealed that different combinations of structuring mechanisms lead to similar types of peatland surface patterning but contrasting underlying patterns in nutrients and hydrology. These contrasting underlying patterns suggest that the presence or absence of the structuring mechanisms can be identified by relatively simple short-term field measurements of nutrients and hydrology, meaning that longer-term field manipulations can be circumvented. Therefore, this study provides promising avenues for future empirical studies on peatland patterning.
Eppinga
Maarten B
MB
Department of Environmental Sciences, Copernicus Institute, Faculty of Geosciences, Utrecht University, P.O. Box 80115, 3508 TC Utrecht, The Netherlands. m.eppinga@geo.uu.nl
de Ruiter
Peter C
PC
Wassen
Martin J
MJ
Rietkerk
Max
M
D018533:Biomass; D003198:Computer Simulation; D005618:Fresh Water; D008954:Models, Biological; D010944:Plants; D012987:Soil; D053833:Wetlands
D012987:Soil