{"id":"marden-2025-knightia-total","source":{"id":"marden-2025","citation":"Marden, M., Mason, N. W. H., Lambie, S., & Rowan, D. (2025). Total plant biomass, carbon stock, and species- and age-specific allometry for 12 of New Zealand's early-colonising indigenous shrub and tree species to 5 years of age. New Zealand Journal of Forestry Science, 55, 3.","title":"Total plant biomass, carbon stock, and species- and age-specific allometry for 12 of New Zealand's early-colonising indigenous shrub and tree species to 5 years of age","authors":["Marden, M.","Mason, N. W. H.","Lambie, S."],"year":2025,"venue":"New Zealand Journal of Forestry Science","doi":"10.33494/nzjfs552025x387x","url":"https://doi.org/10.33494/nzjfs552025x387x","read_url":"https://nzjforestryscience.nz/index.php/nzjfs/article/view/387/122","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Knightia excelsa, NZ, whole-plant biomass from RCD (Table 6)","output":{"quantity":"total_biomass"},"expression":"0.0849 * exp(0.52 * DRC)","published":{"expression":"84.9 * exp(0.052 * RCD)","units":{"RCD":"mm"},"variables":{"RCD":"DRC"},"output_unit":"g"},"taxon":{"level":"species","name":"Knightia excelsa","family":"Proteaceae","group":"broadleaf"},"region":{"scope":"site","countries":["NZ"],"place":"Taruheru River terrace, Gisborne, New Zealand","biomes":["temperate"]},"stand":"plantation","fit":{"r2":0.79,"method":"nonlinear least squares, exponential (y = a e^(bx))"},"evidence":[{"field":"expression","quote":"y = 84.9e0.052x","locator":"Table 6, Total biomass, Knightia excelsa"},{"field":"fit.r2","quote":"0.79","locator":"Table 6, Total biomass, Knightia excelsa, r² column"}],"check":[{"inputs":{"DRC":2},"expected":0.2402,"origin":"computed","note":"hand-computed from the published form (RCD in mm, mass in g, converted)"},{"inputs":{"DRC":6},"expected":1.9227,"origin":"computed","note":"hand-computed from the published form (RCD in mm, mass in g, converted)"},{"inputs":{"DRC":15},"expected":207.21,"origin":"computed","note":"hand-computed from the published form (RCD in mm, mass in g, converted)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Open-spaced juvenile plants (2-year-old containerised plants on-grown for 3 years, sampled up to 5 years). The tables are headed 'at age 5 years' but the appendix figures show points from all harvest years, and the paper gives no n or RCD range for these fits, so none is recorded. x is root collar diameter in mm; biomass in g and height in m (units inferred from Table 2 and Appendix 1 means, which the equations reproduce; the paper does not print units beside the equations). r² for exponential fits is a pseudo r²."}