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Table 3 Coefficients estimated (a, b, m, c1, p1, c2, p2) and standard error (in brackets) for models from Eqs. 2 to 4 and Eq. 6, together the standard deviation of the random variable (StdRnd), Akaike Information Criterion (AIC) and marginal and conditional R2 (M.R2 and C.R2)

From: Stand-level biomass models for predicting C stock for the main Spanish pine species

sp Model a b m c1 p1 c2 p2 StdRnd AIC M.R2 C.R2
Ps Basic 2.7422 (0.0645) 0.7953 (0.0040)       0.1441 15,309 0.9609 0.9654
Basic M 2.1193 (0.1109) 0.7887 (0.0041) 0.0868 (0.0178)      0.1179 15,285 0.9617 0.9659
vm 1.0769 (0.0612) 0.8482 (0.0038) 0.1738 (0.0225) 0.0384 (0.0060) −0.8141 (0.0471)    0.0446 14,414 0.9758 0.9787
Total 0.4692 (0.0302) 0.8460 (0.0038) 0.1980 (0.0253) 0.0536 (0.0087) −0.7265 (0.0467)   −0.1884 (0.0341) 0.0192 14,396 0.9761 0.9789
Pp Basic 2.4602 (0.1064) 0.8430 (0.0086)       0.1564 4184 0.9348 0.9454
Basic M 2.4602 (0.1064) 0.8430 (0.0086)       0.1564 4184 0.9348 0.9454
vm 1.0857 (0.0514) 0.8575 (0.0087)    −0.0868 (0.0130)    0.0808 4155 0.9358 0.9484
Total 0.2988 (0.0122) 0.8762 (0.0061)    −0.1967 (0.0087)   −1.0004 (0.0330) 0.0156 3769 0.9648 0.9750
Ph Basic 1.2790 (0.0299) 0.9466 (0.0042)       0.0900 13,158 0.9495 0.9671
Basic M 0.9246 (0.0472) 0.9365 (0.0043) 0.1429 (0.0233)      0.0685 13,104 0.9495 0.9680
vm 1.0488 (0.0427) 0.9258 (0.0038) 0.0591 (0.0141) 0.4144 (0.0236) 0.5947 (0.0613)    0.0843 12,554 0.9604 0.9756
Total 1.6377 (0.0570) 0.9132 (0.0032) 0.0547 (0.0117) 0.1571 (0.0149) 0.8163 (0.1005) −0.5534 (0.0143)   0.0852 11,887 0.9784 0.9824
Pn Basic 1.8320 (0.0415) 0.8905 (0.0039)       0.0970 10,751 0.9762 0.9787
Basic M 2.0679 (0.0787) 0.8914 (0.0039) −0.0326 (0.0079)      0.1078 10,735 0.9764 0.9790
vm 1.0489 (0.0330) 0.9422 (0.0024) 0.0275 (0.0072) 0.0766 (0.0094) −0.5930 (0.0312)    0.0487 9133 0.9903 0.9932
Total 0.4478 (0.0162) 0.9363 (0.0024) 0.0395 (0.0076) 0.1282 (0.0173) −0.4745 (0.0301)   −0.2534 (0.0214) 0.0178 9027 0.9911 0.9937
Pt Basic 1.2275 (0.0257) 0.8997 (0.0037)       0.0541 9360 0.9793 0.9828
Basic M 1.2275 (0.0257) 0.8997 (0.0037)       0.0541 9360 0.9793 0.9828
vm 1.2275 (0.0257) 0.8997 (0.0037)       0.0541 9360 0.9793 0.9828
Total 0.5757 (0.0180) 0.9009 (0.0040)    0.0162 (0.0066) 0.1445 (0.0415)   0.0255 9354 0.9800 0.9829
  1. sp, are the species analyzed: Ps Pinus sylvestris, Pp Pinus pinea, Ph Pinus halepensis, Pn Pinus nigra, and Pt Pinus pinaster. Names of models Basic, Basic M, vm and Total correspond to Eqs. 2, 3, 4 and 6 respectively