The diagram below represents the flow of energy through an oak forest ecosystem:
Based on the data in the diagram, what is the net productivity of the primary consumers in kJ m−2y−1\text{kJ m}^{-2} \text{y}^{-1}kJ m−2y−1?
1,260 kJ m−2y−11,260 \text{ kJ m}^{-2} \text{y}^{-1}1,260 kJ m−2y−1
252 kJ m−2y−1252 \text{ kJ m}^{-2} \text{y}^{-1}252 kJ m−2y−1
468 kJ m−2y−1468 \text{ kJ m}^{-2} \text{y}^{-1}468 kJ m−2y−1
720 kJ m−2y−1720 \text{ kJ m}^{-2} \text{y}^{-1}720 kJ m−2y−1