{"id":"chojnacky-2014-woodland-juniper-refit","source":{"id":"chojnacky-2014","citation":"Chojnacky, D.C., Heath, L.S., Jenkins, J.C. (2014). Updated generalized biomass equations for North American tree species. Forestry, 87(1), 129–151.","title":"Updated generalized biomass equations for North American tree species","authors":["Chojnacky, D.C.","Heath, L.S.","Jenkins, J.C."],"year":2014,"venue":"Forestry: An International Journal of Forest Research","doi":"10.1093/forestry/cpt053","url":"https://doi.org/10.1093/forestry/cpt053","read_url":"https://research.fs.usda.gov/download/treesearch/45402.pdf","access":"open","checked_at":"2026-11-01","status":"current"},"name":"North American taxa group: woodland juniper refit (Table 5 footnote 2)","output":{"quantity":"agb"},"expression":"exp(-2.719 + 2.2598 * ln(DRC))","published":{"expression":"exp(-2.719 + 2.2598 * ln(drc))","units":{"drc":"cm"},"variables":{"drc":"DRC"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Woodland Cupressaceae, mostly juniper (Cupressus spp., Juniperus monosperma, J. occidentalis, J. osteosperma)","family":"Cupressaceae","group":"conifer","members":["Juniperus monosperma","Juniperus occidentalis","Juniperus osteosperma"],"members_complete":false},"region":{"scope":"national","countries":["US"],"place":"United States (equations compiled from US and Canadian studies)","biomes":["temperate","dryland"]},"stand":"mixed","fit":{"method":"Refit of the woodland Cupressaceae taxon after adding pseudodata from unpublished studies where drc was measured by the current FIA definition; no back-transform correction"},"evidence":[{"field":"expression","quote":"ln(biomass) = β0 + β1 ln(diameter)","locator":"Table 5 caption, p. 140"},{"field":"expression","quote":"[ln(biomass) = −2.7190 + 2.2598 ln(drc)]","locator":"Table 5 footnote 2, p. 140"},{"field":"notes","quote":"predicted 10–36% higher, depending on diameter","locator":"Table 5 footnote 2, p. 140"},{"field":"taxon","quote":"Cupressaceae J. osteosperma Juniper, Utah 65 0.54 3","locator":"Table 4, p. 138"},{"field":"fit.cf","quote":"we did not include a correction (Baskerville, 1972) for underestimation","locator":"Methods, p. 139"}],"check":[{"inputs":{"DRC":30},"expected":143.5992,"origin":"computed","note":"computed from the published form at drc = 30 cm"}],"verification":"original_read","checked_at":"2026-11-03","notes":"The authors' alternative to the woodland Cupressaceae equation, which they say 'seemed to predict low, possibly due to influence from early juniper diameter measurements'. It predicts 10–36% more, depending on diameter. The paper gives no n, range or R² for it. By root-collar diameter."}