Results for (b)–(i) were averaged over 1991–2000 to indicate the accumulated influences of different coupling schemes on the analyzed variables. (g) Total organic soil nitrogen (including the three litter pools and three SOM pools) integrated to 1-m depth. (f) Total organic soil carbon (including the three litter pools and three SOM pools) integrated to 1-m depth. (a) Cumulative NEE (for better visualization, negative NEE implies carbon emission to the atmosphere, which is contrary to the standard use). Note the red edges of the boxes are used to enhance the visual readability.Ĭomparison of global simulations for the historical period of 1850–2000.
In applying the numerical schemes, step 1 identifies the total soil mineral nitrogen available for potential immobilization, step 2 computes the scaling ratio using the defined available nitrogen (upper stack of boxes) divided by effective immobilization flux (bottom stack of boxes), and step 3 gives the remaining soil mineral nitrogen (in green) for the next coupling time step and actual immobilization flux (in orange) within the current coupling time step. (2013).Ī graphic example of the three numerical nitrogen limitation schemes that are used to couple the nitrogen mobilizing processes ( : example magnitude of two boxes) and immobilizing processes ( : example magnitude of four boxes) with the soil mineral nitrogen pool at the beginning of a coupling time step. A description of how the biogeochemistry of ELM is computed can be found in Oleson et al. The total demand is then compared with available nitrogen to either satisfy all immobilizing demands or scale them down using the different coupling schemes described in the main text.
In competing for soil mineral nitrogen, a demand flux is first computed for each immobilizing process. The red and blue lines indicate immobilizing processes.
Pathway 1 (green arrow) is the only nitrogen mobilizing process. A schematic illustration of how plant and microbial processes compete for different soil mineral nitrogen species.
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