003420000a2200121000450024500490000065000270004965000120007665000230008804100130011170000250012410000240014977300470017310aPrimary production in terrestrial ecosystems14aProductividad primaria14aBiomasa14aEcología vegetal0 aInglés1 aWhittaker, Robert H.1 aWoodwell, George M.1 tAmerican Zoologist3477h8q19-30d1968g8