{"id":"martinez-dominguez-2020-total","source":{"id":"martinez-dominguez-2020","citation":"Martínez-Domínguez, A., Ruiz-Aquino, F., Santiago-García, W., et al. (2020). Allometric equations to estimate aboveground and belowground biomass of Pinus patula Schiede ex Schltdl. & Cham. Forest Science and Technology, 16(3), 161-170.","title":"Allometric equations to estimate aboveground and belowground biomass of Pinus patula Schiede ex Schltdl. & Cham.","authors":["Martínez-Domínguez, A.","Ruiz-Aquino, F.","Santiago-García, W."],"year":2020,"venue":"Forest Science and Technology","doi":"10.1080/21580103.2020.1801526","url":"https://doi.org/10.1080/21580103.2020.1801526","read_url":"https://www.tandfonline.com/doi/full/10.1080/21580103.2020.1801526","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Pinus patula Total biomass (roots, stem, branches, foliage) from D and H (Table 3)","output":{"quantity":"total_biomass"},"expression":"exp(-4.7483 + 1.7395 * ln(D * H))","published":{"expression":"exp(-4.7483 + 1.7395 * ln(D * TH))","units":{"D":"cm","TH":"m"},"variables":{"TH":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus patula","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["MX"],"place":"Ixtlán de Juárez, Sierra Norte, Oaxaca (pine-oak forest)","biomes":["temperate","montane"]},"stand":"natural","fit":{"n_trees":25,"dbh_min_cm":3.5,"dbh_max_cm":25.7,"h_min_m":4.32,"h_max_m":20.18,"r2":0.9886,"method":"nonlinear regression (SAS PROC MODEL), exponential form"},"evidence":[{"field":"expression","quote":"y = e(−β0 + β1 ln (D × TH))","locator":"Section 3.1 (Model 1, Table 1)"},{"field":"expression","quote":"β0 4.7483, β1 1.7395, R2 0.9886","locator":"Table 3, model (1) (CSV table download; p. 164 of the PDF)"},{"field":"fit.n_trees","quote":"a destructive analysis was made of 25 trees distributed in five diameter classes","locator":"Abstract"},{"field":"fit.dbh_min_cm","quote":"diameter at breast height (D) that varied from 3.5 cm to 25.7 cm, with a total height (TH) fluctuating from 4.32 m to 20.18 m","locator":"Section 3.1"}],"check":[{"inputs":{"D":8,"H":7},"expected":9.5239,"origin":"computed","note":"computed from the published form"},{"inputs":{"D":13,"H":12},"expected":56.5952,"origin":"computed","note":"computed from the published form"},{"inputs":{"D":22,"H":18},"expected":286.1082,"origin":"computed","note":"computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Printed form y = e^(−β0 + β1 ln(D × TH)); the tabulated β0 is positive and enters with a minus sign, as printed. Units are D in cm, TH in m, biomass in kg dry weight (Figure 3). No correction factor stated. Parameters read from the journal table CSV downloads. The paper also fits an additive simultaneous system (Table 6) with slightly different parameters; not added. The foliage model (Table 4: ϖ0 8.1986, ϖ1 1.6628, R2 0.9762) is not added here; the printed additive formula in Section 3.3 shows the foliage intercept without the minus sign, but Figure 3(d) (p. 166) prints the fitted foliage curve as y = e^(−8.198579+(1.66277 ln(D x TH))), n=25, so the sign is a typesetting slip and the model could be added as exp(−8.1986 + 1.6628 ln(D × TH)). Authors recommend use for 5 to 25 cm DBH. Total includes roots, stem, branches and foliage."}