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Height growth curves and site index tables for subalpine fir, Engelmann spruce, and lodgepole pine in.. Klinka, Karel; Chen, Han Y. H.; Wang, Qingli; Chourmouzis, Christine 1998-12-31

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Home  Scientia Silvica  Extension Series, Number 15, 1998  Height growth curves and site index tables for subalpine fir, Engelmann spruce, and lodgepole pine in the ESSF zone of BC Height growth models of coastal low- and mid-elevation Pacific silver fir, low-elevation white spruce, and low- and midelevation lodgepole pine have been used for predicting productivity of subalpine fir, Engelmann spruce, and lodgepole pine, respectively. These models, however, are biased in predicting height growth of high-elevation subalpine fir, Engelmann spruce, and lodgepole pine. To improve this situation, 329 sample plots (165 for subalpine fir, 90 for Engelmann spruce, and 74 for lodgepole pine) were located throughout the Engelmann Spruce-Subalpine Fir (ESSF) zone. Stem analysis was carried out on three dominant trees in each 0.04 ha sample plot. For each study species, a height growth model was developed on the data from two-thirds of the sample plots using the conditioned Chapman-Richards’ function; the model was validated using the remaining one-third of the sample plots. The models developed were used to construct height growth curves and tables. They are recommended for estimating site index of these three major timber crop species in the ESSF zone.    Subalpine fir    Height growth model and curves for subalpine fir in the ESSF zone  where: S =  ]   6 −   −    OQ      (  OQ  − H −×  )  where: H = top height (m); S = site index (height at 50 year breast-height age); A = breast-height age (year); e = the base of exponential function; and ln = natural logarithm.   7RS KHLJKW P  [  + =   +  6 −     − H −  5                        %UHDVWKHLJKW DJH \HDUV      Home   Engelmann spruce    Height growth model and curves for Engelmann spruce in the ESSF zone    [  + =   +  6 −     − H −  5  where: S =  ]   6 −  −    OQ      (  OQ  − H − ×  7RS KHLJKW P       )    where: H = top height (m); S = site index (height at 50 year breast-height age); A = breast-height age (year); e = the base of exponential function; and ln = natural logarithm.                       %UHDVWKHLJKW DJH \HDUV    Lodgepole pine    Height growth model and curves for lodgepole pine in the ESSF zone  where: S =  − H  −  5  ]   6 −  −    OQ      (  OQ  − H −  ×  )   7RS KHLJKW P  [  + =   +  6 −            where: H = top height (m); S = site index (height at 50 year breast-height age); A = breastheight age (year); e = the base of exponential function; and ln = natural logarithm.               %UHDVWKHLJKW DJH \HDUV  Home  Site index table for subalpine fir stands in the ESSF zone EKD  6LWH LQGH[ P    \HDUV                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Site index table for Engelmann spruce stands in the ESSF zone EKD  6LWH LQGH[ P    \HDUV                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Home  Site index table for lodgepole pine stands in the ESSF zone EKD \HDUV                  6LWH LQGH[ P                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Reference Chen, H.Y.H. and K. Klinka. 2000. Height growth models for high-elevation subalpine fir, Engelmann spruce, and lodgepole pine in British Columbia. West. J. Appl. For. 15: 62-69  Scientia Silvica is published by the Forest Sciences Department, The University of British Columbia, ISSN 1209-952X Editor: Karel Klinka (klinka@interchange.ubc.ca) Research: Han Y.H. Chen (han.chen@mnr.gov.on.ca) and Qingli Wang (charlw@mail.sy.ln.cn) Production and design: Christine Chourmouzis (chourmou@interchange.ubc.ca) Financial support: Resource Inventory Branch, BC Ministry of Forests, and Forest Renewal British Columbia Copies available from: www.forestry.ubc.ca/klinka or K. Klinka, Forest Sciences Department, UBC, 3036-2424 Main Mall, Vancouver, BC, V6T 1Z4  

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