{"id":"kraenzel-2000-tectona-grandis-total","source":{"id":"kraenzel-2000","citation":"Kraenzel, M. B. (2000). Carbon storage of Panamanian harvest-age teak (Tectona grandis) plantations. MSc thesis, Department of Biology, McGill University, Montréal.","title":"Carbon storage of Panamanian harvest-age teak (Tectona grandis) plantations","authors":["Kraenzel, M. B."],"year":2000,"venue":"MSc thesis, McGill University","url":"https://mcgill.scholaris.ca/bitstreams/ef6d70e9-7d9b-4a0a-89a4-7465e980bc99/download","access":"open","checked_at":"2026-11-01","status":"current"},"name":"Tectona grandis (teak), 20-year-old Panama plantations, total tree biomass incl. roots","output":{"quantity":"total_biomass"},"expression":"10^(2.575 * log10(D) - 1.042)","published":{"expression":"10^(2.575 * log10(DBH) - 1.042)","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Tectona grandis","family":"Lamiaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["PA"],"place":"Four harvest-age (about 20-year) teak plantations in Panama (Boquerón, Peñas Blancas, Tranquilla, Aguas Claras)","biomes":["tropical"]},"stand":"plantation","fit":{"n_trees":9,"dbh_min_cm":16.9,"dbh_max_cm":43.8,"r2":0.9778,"rse":0.056,"method":"OLS on log10(tree biomass) vs log10(DBH); no correction factor reported"},"evidence":[{"field":"expression","quote":"Log Tree B = 2.575(log DBH) - 1.042","locator":"Figure 4, equation 1 (thesis p. 55)"},{"field":"fit.r2","quote":"r2 = 0.9778, SEE = 0.056 (equation 1)","locator":"Figure 4"},{"field":"fit.dbh_min_cm","quote":"diameter at breast height of the nine excavated trees ranged between 16.9 and 43.8 cm","locator":"Results, tree biomass section"},{"field":"output.quantity","quote":"Coarse Roots 14.2 31.4 28.8","locator":"Table 3 (tree totals include coarse and fine roots)"}],"check":[{"inputs":{"D":16.9},"expected":131.7675,"origin":"computed","note":"computed from the published form at the smallest sampled DBH (observed totals ranged 122.1–1365.0 kg)"},{"inputs":{"D":43.8},"expected":1530.3679,"origin":"computed","note":"computed from the published form at the largest sampled DBH"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Tree biomass B (kg dry mass) is the whole tree including excavated coarse and fine roots (Table 3 totals), so this is total above + below biomass; mean root:shoot ratio 0.157. log is base 10. SEE is on the log10 scale. Thesis precursor of Kraenzel et al. (2003) Forest Ecology and Management 173:213–225 (paywalled, not read); coefficients there may differ."}