The present invention is a storage storage definition unit that defines the storage storage of the forest as a tree storage storage, dead organic matter storage and soil storage; A path definition unit for defining a nitrogen movement path between the wood storage storage, dead organic matter storage and soil storage storage; And a storage amount calculator configured to calculate a storage amount of nitrogen stored in the forest tree storage, dead organic matter storage, and soil storage based on the amount of nitrogen moved in each of a plurality of movement paths defined between the forest tree storage, dead organic matter storage and soil storage storage. Disclosed is a forest nitrogen modeling system including a and a forest carbon/nitrogen modeling system reflecting the same.
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