@prefix dct: . @prefix ns1: . @prefix ns2: . @prefix ns3: . @prefix rdfs: . @prefix skos: . a skos:Concept ; dct:created "2019-01-14" ; dct:modified "2019-01-14" ; ns3:hasProfile ; ns1:status ; rdfs:seeAlso ; skos:definition "Production of carbon means the production of biomass expressed as the mass of carbon which it contains. Gross primary production is the rate of synthesis of biomass from inorganic precursors by autotrophs (producers)"@en ; skos:exactMatch ; skos:prefLabel "gross primary productivity of biomass expressed as carbon"@en ; ns2:hadPrimarySource .