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Generalized biomass equations for jack pine pinus banksiana and red pine pinus resinosa in the lake states usa



Generalized biomass equations for jack pine pinus banksiana and red pine pinus resinosa in the lake states usa



Canadian Journal of Forest Research 12(4): 913-921



The biomass of 76 jack pine (P. banksiana Lamb.) trees (29 stands) and 72 red pine (P. resinosa Ait.) trees (28 stands) from throughout the northern Lake States was determined. All trees were from even-aged, unthinned plantations ranging 20-61 yr old; site indexes represented nearly the complete range for these species. Individual tree component weights (foliage, live branches, dead branches, stem wood and stem bark) were regressed against dbh [diameter [D], breast height] and tree height [H] using the nonlinear form B1 = aDbHc. Stand biomass was also estimated with stand basal area and mean height of dominant and codominant trees using the equation form Bs = a + b(B) + c(Hs) or a + b(B)(Hs). The equations were tested in 2 additional stands of red pine and two of jack pine and by comparison with literature values. Individual tree equations were most accurate for estimating bole components and the total tree and less accurate for foliage and branches. The SE of the estimate divided by mean weight ranged 0.06-0.17 for bole components, 0.21-0.28 for live crown components, and 0.43-0.49 for dead branches. For all components, jack pine equations were slightly less precise than those for red pine. The individual tree equations appear to be applicable over a wide geographical area and usable for both natural stands and plantations. The equations appear valid for the majority of unthinned stands in the age range of 20-50 yr. The stand equations, while less precise than individual tree estimates, should give reasonably accurate estimates of stand biomass components in most situations.

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Related references

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