{"id":"farias-2019-m9","source":{"id":"farias-2019","citation":"Farias, A.A., Gezan, S.A., Carvalho, M.P., et al. (2019). Allometric Equations to Predict Pinus palustris Biomass in the Southeastern United States. Floresta e Ambiente, 26(Spec No 1), e20180403.","title":"Allometric Equations to Predict Pinus palustris Biomass in the Southeastern United States","authors":["Farias, A.A.","Gezan, S.A.","Carvalho, M.P."],"year":2019,"venue":"Floresta e Ambiente","doi":"10.1590/2179-8087.040318","url":"https://doi.org/10.1590/2179-8087.040318","read_url":"http://www.scielo.br/pdf/floram/v26nspe1/2179-8087-floram-26-spe01-e20180403.pdf","access":"open","license":"CC BY","checked_at":"2026-11-02","status":"current"},"name":"Longleaf pine above-stump biomass, model 9 (DBH + ln(H.DBH))","output":{"quantity":"agb"},"expression":"exp(-1.7709 + 0.0544 * D + 0.6273 * ln(H * D))","published":{"expression":"exp(-1.7709 + 0.0544 * DBH + 0.6273 * ln(H * DBH))","units":{"DBH":"cm","H":"m"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus palustris","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["US"],"place":"Fort Benning, Camp Lejeune and Polk County, southeastern United States","biomes":["temperate","subtropical"]},"stand":"mixed","fit":{"n_trees":100,"dbh_min_cm":0.81,"dbh_max_cm":54.3,"h_min_m":0.55,"h_max_m":30.4,"r2":0.9784,"rse":0.3641,"method":"ordinary least squares on ln(W)"},"evidence":[{"field":"expression","quote":"9th: ln (W ) = − 1.7709 + 0.0544. ( DBH ) + 0.6273.ln ( H .DBH )","locator":"Table 4"},{"field":"fit.n_trees","quote":"The dataset consisted of measures of 100 longleaf pine trees, obtained from three different sites","locator":"Section 2"},{"field":"fit.dbh_max_cm","quote":"DBH cm 16.0 13.7 0.81 54.3","locator":"Table 1 (mean, SD, min, max)"},{"field":"fit.h_max_m","quote":"H m 11.5 7.7 0.55 30.4","locator":"Table 1 (mean, SD, min, max)"},{"field":"fit.r2","quote":"9 0.3641 0.9784","locator":"Table 2, model 9 (Sy.x, adjusted R2)"}],"check":[{"inputs":{"D":10,"H":8},"expected":4.5811,"origin":"computed","note":"hand-computed from the Table 4 coefficients"},{"inputs":{"D":30,"H":20},"expected":48.1294,"origin":"computed","note":"hand-computed from the Table 4 coefficients"}],"verification":"original_read","checked_at":"2026-11-02","notes":"W is total above-stump biomass (kg); the paper does not say which components are included. Natural log; no back-transformation correction factor is stated, so none is applied. r2 is the adjusted R2 and rse is Sy.x as printed in Table 2. ln(H.DBH) is read as ln of the product H x DBH. The paper also prints stand-level models (Eqs. 15 and 16, needing basal area, trees per hectare and quadratic diameter), which are not captured because those inputs are not canonical variables."}