{"id":"ryan-2011-stem","source":{"id":"ryan-2011","citation":"Ryan, C.M., Williams, M., Grace, J. (2011). Above- and Belowground Carbon Stocks in a Miombo Woodland Landscape of Mozambique. Biotropica, 43(4), 423–432.","title":"Above- and Belowground Carbon Stocks in a Miombo Woodland Landscape of Mozambique","authors":["Ryan, C.M.","Williams, M.","Grace, J."],"year":2011,"venue":"Biotropica","doi":"10.1111/j.1744-7429.2010.00713.x","url":"https://doi.org/10.1111/j.1744-7429.2010.00713.x","read_url":"http://web.archive.org/web/20190427125852id_/https://www.research.ed.ac.uk/portal/files/16641514/C_stock_overview_v13_w_proofs.pdf","access":"paywalled","checked_at":"2026-11-01","status":"current","notes":"Read the author's accepted manuscript with proofs from the University of Edinburgh repository (archived copy)."},"name":"Miombo stem biomass (trunk and branches), DBH only","output":{"quantity":"agb","excludes":["foliage"]},"expression":"exp(2.601 * ln(D) - 3.629) / 0.47","published":{"expression":"exp(2.601 * ln(DBH) - 3.629) / 0.47","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Miombo woodland trees","group":"broadleaf"},"region":{"scope":"site","countries":["MZ"],"place":"Nhambita, Sofala province, Mozambique","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":29,"dbh_min_cm":5,"dbh_max_cm":73,"r2":0.93,"rse":0.52,"method":"OLS on ln-transformed data, no correction factor"},"evidence":[{"field":"expression","quote":"log(Bdest,s) = 2.601 log(DBH,dest)-3.629","locator":"Table 1"},{"field":"fit.dbh","quote":"The 29 sampled trees ranged in DBH from 5-73 cm.","locator":"Results, Tree stem and root biomass"},{"field":"notes","quote":"the mean (47%±0.20) was used for all conversions to C mass","locator":"Methods"}],"check":[{"inputs":{"D":20},"expected":136.72,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":50},"expected":1482.07,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"The paper's equation gives kg carbon (log is natural log). Converted here to kg dry mass by dividing by the paper's mean carbon fraction 0.47; that division is in both expressions. Stem biomass covers trunk and branches; leaves are not included, so it slightly underestimates total AGB. Back-transformed without a correction factor, as the authors did."}