{"id":"mason-2014-agb","source":{"id":"mason-2014","citation":"Mason, N. W. H., Beets, P. N., Payton, I., Burrows, L., Holdaway, R. J., & Carswell, F. E. (2014). Individual-Based Allometric Equations Accurately Measure Carbon Storage and Sequestration in Shrublands. Forests, 5(2), 309–324.","title":"Individual-Based Allometric Equations Accurately Measure Carbon Storage and Sequestration in Shrublands","authors":["Mason, N. W. H.","Beets, P. N.","Payton, I."],"year":2014,"venue":"Forests","doi":"10.3390/f5020309","url":"https://doi.org/10.3390/f5020309","read_url":"https://www.mdpi.com/1999-4907/5/2/309/htm","access":"open","license":"CC BY 3.0","checked_at":"2026-11-02","status":"current"},"name":"NZ shrubland shrubs and small trees, dry weight from basal area x height","output":{"quantity":"agb"},"expression":"exp(1.0215 * ln(0.785398163397448 * (DRC / 100)^2 * H) + 6.1512)","published":{"expression":"exp(1.0215 * ln(0.785398163397448 * (DRC / 100)^2 * H) + 6.1512)","units":{"DRC":"cm","H":"m"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Shrubland shrubs and small trees, all species (Kunzea ericoides, Leptospermum scoparium, Ulex europaeus, Cytisus scoparius and others)","group":"shrub","members":["Kunzea ericoides","Leptospermum scoparium","Ulex europaeus","Cytisus scoparius"],"members_complete":false},"region":{"scope":"regional","countries":["NZ"],"place":"Oxford (Canterbury) and d'Urville Island, South Island, New Zealand","biomes":["temperate"]},"stand":"natural","fit":{"n_trees":162,"r2":0.93,"method":"iterative function minimisation of residual sum of squares, DW = exp(a ln(BA x Height) + b)"},"evidence":[{"field":"expression","quote":"Dry weight = exp(a • ln(basal area • height) + b) ... fitted on the entire harvested shrub dataset with a = 1.0215 and b = 6.1512","locator":"Eq. 1 and Figure 3 caption"},{"field":"fit.n_trees","quote":"Overall, 162 shrubs were harvested.","locator":"Section 2.3"},{"field":"fit.r2","quote":"The basal area × height allometric equation accurately (R-square = 0.93) predicted shrub dry weight","locator":"Section 3"}],"check":[{"inputs":{"DRC":3,"H":2},"expected":0.5761,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"DRC":8,"H":4},"expected":8.6753,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Paper predictor is total shrub basal area BA (m2, summed over all stems of the shrub) times maximum shrub height (m). BA is written here as pi/4 * (DRC/100)^2 so DRC is the basal diameter of a single stem, or the equivalent diameter sqrt(sum of d^2) for a multi-stemmed shrub. No back-transform correction is stated. Dry weight is of the whole harvested shrub (foliage and stem were weighed separately and, as the text reads, combined)."}