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. 2014 Mar 25;111(14):E1327–E1333. doi: 10.1073/pnas.1320008111

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Fig. 5. — Comparison of net primary production (NPP) estimates over the US Corn Belt (35°N–50°N, 80°W–105°W) from the USDA agricultural inventory (8) with crop GPP estimates from SIF retrievals (A) and data-driven and process-based model ensembles (B and C). Points correspond to 1° grid boxes with fraction of cropland area higher than 20%. GPP and NPP values are given in per-total-area units (see SI Appendix, NPP Data from Agricultural Inventories). The squared Pearson’s correlation coefficient and the P value of the comparisons are shown. An analogous comparison with the inventory-based NPP from Monfreda et al. (7), which also includes Western Europe, can be found in SI Appendix, NPP Data from Agricultural Inventories.

Inline graphic — Comparison of net primary production (NPP) estimates over the US Corn Belt (35°N–50°N, 80°W–105°W) from the USDA agricultural inventory (8) with crop GPP estimates from SIF retrievals (A) and data-driven and process-based model ensembles (B and C). Points correspond to 1° grid boxes with fraction of cropland area higher than 20%. GPP and NPP values are given in per-total-area units (see SI Appendix, NPP Data from Agricultural Inventories). The squared Pearson’s correlation coefficient and the P value of the comparisons are shown. An analogous comparison with the inventory-based NPP from Monfreda et al. (7), which also includes Western Europe, can be found in SI Appendix, NPP Data from Agricultural Inventories.