http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/363net primary production http://vocab.lternet.edu/vocab/vocab/skos/363 annual net primary production NT http://vocab.lternet.edu/vocab/vocab/skos/363 primary production BT http://vocab.lternet.edu/vocab/vocab/skos/363 NPP UF