{"id":"mendonca-2013-maytenus-rigida","source":{"id":"mendonca-2013","citation":"Mendonça, A.V.R., Souza, J.S., Giulietti, A.M., Van Den Berg, C. (2013). Estimação de biomassa aérea da caatinga no norte da Bahia. Pesquisa Florestal Brasileira, 33(76), 355-368.","title":"Estimação de biomassa aérea da caatinga no norte da Bahia","authors":["Mendonça, A.V.R.","Souza, J.S.","Giulietti, A.M."],"year":2013,"venue":"Pesquisa Florestal Brasileira","doi":"10.4336/2013.pfb.33.76.579","url":"https://doi.org/10.4336/2013.pfb.33.76.579","read_url":"http://ainfo.cnptia.embrapa.br/digital/bitstream/item/102670/1/EstimacaoBiomassa.pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Maytenus rigida, total aerial dry biomass from ground-level diameter and height (Table 2)","output":{"quantity":"agb"},"expression":"-125.773 + 30.7247 * DRC + 43.1044 * H + 1.60801 * DRC^2 - 10.2886 * DRC * H + 0.577549 * DRC^2 * H","published":{"expression":"-125.773 + 30.7247 * DAS + 43.1044 * H + 1.60801 * DAS^2 - 10.2886 * DAS * H + 0.577549 * DAS^2 * H","units":{"DAS":"cm","H":"m"},"variables":{"DAS":"DRC"},"output_unit":"kg"},"taxon":{"level":"species","name":"Maytenus rigida","family":"Celastraceae","group":"broadleaf"},"region":{"scope":"site","countries":["BR"],"place":"Casa Nova and Remanso, northern Bahia, lower-middle São Francisco (caatinga arbustivo-arbórea)","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":15,"r2":0.996,"method":"regression; model chosen among literature models and Backward/Forward stepwise fits by residual plots, S%, t test and R2"},"evidence":[{"field":"expression","quote":"MS = -125,773+(30,7247*D)+(43,1044*H)+ +(1,60801*D²)+(-10,2886*DH)+(0,577549*D²H)","locator":"Table 2, p. 360"},{"field":"fit.n_trees","quote":"amostrados 15 indivíduos, sendo três para cada classe de diâmetro, com exceção da espécie Chamaecrista belemii, em que foram amostrados 30 indivíduos","locator":"Ajuste das equações de regressão, p. 357"},{"field":"fit.r2","quote":"99,6 (R²)","locator":"Table 2, p. 360"}],"check":[{"inputs":{"DRC":6,"H":3},"expected":122.957,"origin":"computed","note":"hand-computed from the published form (coefficients as printed)"},{"inputs":{"DRC":10,"H":4},"expected":334.168,"origin":"computed","note":"hand-computed from the published form (coefficients as printed)"},{"inputs":{"DRC":14,"H":5},"expected":680.861,"origin":"computed","note":"hand-computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Table 2 prints R2 as a percentage. D is diameter at ground level (DAS, 'diâmetro ao nível do solo', cm), mapped to DRC; H is total height in m; MS is dry mass in kg (Table 2 footnote). 'DH' and 'DH2' are read as D*H and D*H^2, and 'D2H' as D^2*H (variables listed on p. 358 as DAS*H, DAS*H2, DAS2*H). Total aerial dry biomass (leaves, branches, trunk). Diameter range of the sampled trees printed as 5 a 15 cm (ground-level diameter, so not entered as a DBH range): use inside that range. Equations were also fitted by diameter class for all species pooled (Table 3); those are not included here."}