net product; net production
Technical term used in ecology and economics to refer to the amount of biomass or value produced after subtracting consumption or costs.
In ecology, net production is the gross production minus consumption through respiration.
The net product of this region is increasing year by year.
総生産量 means gross production, while 純生産量 is the net amount after deductions.
Compound of 純 (じゅん, 'net, pure') + 生産 (せいさん, 'production') + 量 (りょう, 'amount').