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Table 3 C4 and C3 ETA parameters for USA by AEZ

From: Biofuels, cropland expansion, and the extensive margin

AEZ C4 NPP for cropland C4 NPP for natural land C4 ETA C3 NPP for cropland C3 NPP for natural land C3 ETA
7 1.5458 1.1320 0.73 0.4292 0.3101 0.72
8 1.8578 1.3194 0.71 0.5203 0.3687 0.71
9 2.1272 2.2656 1.07 0.6314 0.6884 1.09
10 2.7180 2.5288 0.93 0.8522 0.8004 0.94
11 3.5494 3.3902 0.96 1.1363 1.1019 0.97
12 2.7455 2.4367 0.89 0.8750 0.7762 0.89
13 1.5184 1.4000 0.92 0.4053 0.3698 0.91
14 3.3390 1.7192 0.51 0.9340 0.4577 0.49
15 3.3484 2.3937 0.71 1.0813 0.7410 0.69
  1. NPPs are measured in metric tons per hectare per year (metric tons ha−1 year−1). In this table, AEZs with no or limited land are dropped, and the upper bound of ETA is not enforced.