{"id":"de-cauwer-2020-vtot-d-h","source":{"id":"de-cauwer-2020","citation":"De Cauwer, V., Beeckman, H., Kleinn, C., Moses, M., Nott, A., Seifert, T., Muys, B. (2020). Improving the knowledge base for tropical dry forest management in southern Africa: Regional volume models for Pterocarpus angolensis. Forest Ecology and Management, 477, 118485.","title":"Improving the knowledge base for tropical dry forest management in southern Africa: Regional volume models for Pterocarpus angolensis","authors":["De Cauwer, V.","Beeckman, H.","Kleinn, C."],"year":2020,"venue":"Forest Ecology and Management","doi":"10.1016/j.foreco.2020.118485","url":"https://doi.org/10.1016/j.foreco.2020.118485","read_url":"https://lirias.kuleuven.be/retrieve/00adf4e9-cc77-4da0-88bc-0454a2f00a1c","access":"open","checked_at":"2026-11-02","status":"current","notes":"Read the author's copy on KU Leuven Lirias (carries the published article's page layout and tables). The candidate title in the queue is truncated; the full title names Pterocarpus angolensis."},"name":"Total wood volume from DBH and height (Model 3, Table 5)","output":{"quantity":"total_volume"},"expression":"exp(-8.626 + 2.232 * ln(D) + 0.041 * H)","published":{"expression":"exp(-8.626 + 2.232 * ln(DBH) + 0.041 * H)","units":{"DBH":"cm","H":"m"},"variables":{"DBH":"D"},"output_unit":"m3"},"taxon":{"level":"species","name":"Pterocarpus angolensis","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["NA","AO"],"place":"Baikiaea-Pterocarpus woodlands of northern Namibia and southern Angola (MAP 480-700 mm)","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":69,"dbh_min_cm":9,"dbh_max_cm":73,"r2":0.96,"method":"Regression on ln scale with Baskerville correction in intercept; adjusted R2"},"evidence":[{"field":"expression","quote":"V tot = exp(a + b 1 *lnDBH + b 2 *H) ... -8.626 *** 2.232 *** 0.041 ***","locator":"Table 5, Model 3"},{"field":"fit.n_trees","quote":"Models for Vtot were established with the data of 69 trees","locator":"Section 3.1"},{"field":"fit.dbh","quote":"diameter at breast height (DBH) in the range of 9 to 73 cm","locator":"Table 5 caption"}],"check":[{"inputs":{"D":20,"H":8},"expected":0.199583,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":50,"H":14},"expected":1.97316,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Table 5 caption: 'models with intercept a including the Baskerville correction factor', so the correction is already inside the printed intercept and nothing is added here (no separate CF value is printed). Total over-bark wood volume of the tree including branches and stump. Paper's RSE (0.49 m3 calibration) is on the volume scale, not log scale, so fit.rse is left out; R2 is the printed adjusted R2. Height enters linearly (b2*H), not as ln(H), as printed."}