Variables, functions, and parameters.

Table notes: i refers to nitrogen (N) and phosphorus (P). C: carbon. SOM: soil organic matter. Parameters are from [40], except for δi and mi (adapted from m in [40] to account for two soil organic pools per nutrient here rather than one), hi (chosen to equal φi), εi (reasonable guesses), ki (adjusted to reflect greater N than P loss due to greater soil mobility), and P input parameters (chosen to equal IP in the previous work on young soils but for weathering to proceed at a relatively rapid rate).