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Table 1 Summary of data used to develop dry weight biomass models. Note that plots where a target species, sp, is studied, other pine species could be present

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

sp   Initial SNFI survey Final SNFI survey
  Nsp_I NI Vsp_I VI Wsp_I fsp_I Nsp_F NF Vsp_F VF Wsp_F fsp_F M
Ps
(# 1854)
Mean 753 846 109.7 121.9 109.7 0.51 794 909 159.2 178.3 147.3 0.50 51
sd 544 560 91.6 90.8 69.1 0.07 570 588 108.5 104.1 80.6 0.06 14
Min 14 46 3.0 17.1 5.1 0.35 14 56 5.8 26.3 8.0 0.37 23
Max 3692 4106 747.4 747.4 520.3 1.11 4297 4311 826.8 843.2 574.5 0.93 118
Pp
(# 537)
Mean 337 386 51.5 59.4 66.8 0.51 348 405 76.1 88.3 92.7 0.48 24
sd 357 376 38.6 39.1 40.2 0.14 369 387 49.8 50.1 50.6 0.1 5
Min 5 20 1.7 11.8 3.6 0.18 5 31 2.0 17.1 3.8 0.23 12
Max 3102 3197 350.4 350.4 335.4 1.65 3233 3233 406.0 406.0 392.3 1.24 45
Ph
(# 2039)
Mean 491 516 37.3 39.5 37.4 0.52 546 579 56.9 60.3 57.6 0.48 21
sd 348 352 24.5 25.3 23.0 0.14 377 381 35.5 36.8 33.5 0.09 6
Min 5 25 2.8 4.8 2.6 0.29 5 25 3.3 7.5 3.2 0.21 7
Max 2465 3006 238.2 241.4 194.6 1.84 2451 2798 283.0 287.6 242.9 1.18 52
Pn
(# 1414)
Mean 703 837 75.8 90.6 83.8 0.54 749 909 111.1 133.5 117.2 0.53 38
sd 586 604 61.8 62.5 59.6 0.09 615 629 78.9 77.2 74.1 0.07 10
Min 10 41 1.4 17.8 2.7 0.35 10 41 2.3 22.5 4.0 0.29 20
Max 4994 4994 522.8 522.8 451.7 1.22 4623 4623 577.4 577.4 552.4 1.65 105
Pt
(# 1358)
Mean 532 604 94.8 103.5 71.3 0.51 550 640 149.5 163.1 108.6 0.49 33
sd 443 466 64.8 66.5 44.1 0.07 443 472 88.8 87.8 57.7 0.06 12
Min 10 51 1.4 19.3 1.2 0.33 10 40 6.2 30.8 5.5 0.35 17
Max 3310 3310 515.6 562.5 332.8 0.89 2886 2886 652.4 652.4 475.3 0.91 87
  1. N, is the total number of trees per hectare while Nsp represents the number of trees of the main species; V, is the total volume and Vsp main species volume, both in m3·ha− 1; Wsp is the main species dry weight of biomass in Mg·ha− 1; fsp, is the species stand form factor, calculated as in Eq. 5; and M is the Martonne aridity index in mm·°C− 1. The subscript “I” refers to initial survey and “F” to final survey. Ps Pinus sylvestris, Pp P. pinea, Ph P. halepensis, Pn P. nigra, and Pt P. pinaster. The number of plots used to develop models is shown under the name of the target species (#)