Ecological Archives E090-152-A1

Feike A. Dijkstra. 2009. Modeling the flow of 15N after a 15N pulse to study long-term N dynamics in a semiarid grassland. Ecology 90:2171–2182.

Appendix A. Effects of the five scenarios on labeled-N fractions in belowground plant biomass.

FigA1
 
   FIG. A1. Simulation (lines) and actual data (symbols) of the labeled-N fraction in belowground plant biomass during five years after a 0.4 g/m2 15N addition using parameters listed in Table 2.  Simulation of the labeled-N fraction in aboveground biomass for (A) scenario 1: plant/microbial competition for N, (B) scenario 2: microbial activity, (C) scenario 3: active soil N, (D) scenario 4: N loss, and (E) N resorption and re-translocation.  Each panel shows the actual data of the ambient CO2 plots (closed circles) and elevated CO2 plots (open circles) and the model simulation of the ambient CO2 plots (solid lines), A runs (dotted lines) and B runs (dashed lines).  Panel A also includes the model simulation of the ambient CO2 plots with a root turnover time of seven years (dash-dot line).  Inserted are the goodness of fit G values calculated for the simulations of the labeled-N fraction in belowground plant biomass.

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