The present invention includes a storage definition unit that defines a forest storage storage as a forest storage storage, a dead organic matter storage and a soil storage storage; A path definition unit defining a nitrogen movement path between the forestry 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 the 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 and a forest carbonitrogen modeling system reflecting the same.
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