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Forests 2013, 4(1), 179-196; doi:10.3390/f4010179

Aboveground Tree Biomass for Pinus ponderosa in Northeastern California

1
USDA Forest Service, Pacific Southwest Research Station, 3644 Avtech Parkway, Redding, CA 96002, USA
2
USDA Forest Service, Shasta-Trinity National Forest, 3644 Avtech Parkway, Redding, CA 96002, USA
*
Author to whom correspondence should be addressed.
Received: 31 January 2013 / Revised: 1 March 2013 / Accepted: 11 March 2013 / Published: 21 March 2013
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Abstract

Forest managers need accurate biomass equations to plan thinning for fuel reduction or energy production. Estimates of carbon sequestration also rely upon such equations. The current allometric equations for ponderosa pine (Pinus ponderosa) commonly employed for California forests were developed elsewhere, and are often applied without consideration potential for spatial or temporal variability. Individual-tree aboveground biomass allometric equations are presented from an analysis of 79 felled trees from four separate management units at Blacks Mountain Experimental Forest: one unthinned and three separate thinned units. A simultaneous set of allometric equations for foliage, branch and bole biomass were developed as well as branch-level equations for wood and foliage. Foliage biomass relationships varied substantially between units while branch and bole biomass estimates were more stable across a range of stand conditions. Trees of a given breast height diameter and crown ratio in thinned stands had more foliage biomass, but slightly less branch biomass than those in an unthinned stand. The observed variability in biomass relationships within Blacks Mountain Experimental Forest suggests that users should consider how well the data used to develop a selected model relate to the conditions in any given application.
Keywords: allometry; foliage; crown biomass; silvicultural thinning, component ratio allometry; foliage; crown biomass; silvicultural thinning, component ratio
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ritchie, M.W.; Zhang, J.; Hamilton, T.A. Aboveground Tree Biomass for Pinus ponderosa in Northeastern California. Forests 2013, 4, 179-196.

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