This is probably a softball question but because of the nature of the term, it's difficult to Google. I am not a biologist, I am a web developer. :-)
What does this measurement mean (it is a measurement of biomass production): 50 g m-2 d-1
I believe it means 50 grams per square meter per day - but not sure why there are '-' signs in there.
And perhaps more complicated, it is possible to translate this measurement to volume (either cubic meters or ideally cubic feet)?