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Forests 2013, 4(2), 455-470; doi:10.3390/f4020455
Article

Modeling Young Stand Development towards the Old-Growth Reference Condition in Evergreen Mixed-Conifer Stands at Headwaters Forest Reserve, California

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Received: 2 May 2013; in revised form: 8 June 2013 / Accepted: 13 June 2013 / Published: 20 June 2013
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Abstract: We sought to answer the question: How do we restore characteristics of old-growth evergreen mixed-conifer forests in young even-aged stands on upland terrain at Headwaters Forest Reserve (HFR)? We described the old-growth reference condition for three stands at HFR. In each old-growth stand, trees within a 1-ha plot were inventoried. We found coast Douglas-fir (Pseudotsuga menziesii var. menziesii) and tanoak (Notholithocarpus densiflorus) well represented while coast redwood (Sequoia sempervirens) dominated in terms of size. Numbers of understory and overstory trees ha−1 and average tree sizes were similar among sites, suggesting these were useful goals for restoration. Adjacent to each old-growth stand, we measured recent growth rates of second-growth trees and remnant old trees across a range of tree sizes, stand structures, and densities. The resultant growth models of redwood and Douglas-fir enabled us to project the development of precommercially thinned young stands at HFR forward in time under two silvicultural prescriptions: (i) no further management; and (ii) partial harvesting simulated before trees attained 30 cm dbh. The partial-harvesting prescription reduced stand density and set the young stand on a more rapid trajectory towards the reference condition found at HFR.
Keywords: coast redwood; Douglas-fir; forest restoration; precommercial thinning; Pseudotsuga menziesii; Sequoia sempervirens; stand density management coast redwood; Douglas-fir; forest restoration; precommercial thinning; Pseudotsuga menziesii; Sequoia sempervirens; stand density management
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Berrill, J.-P.; Beal, C.B.; LaFever, D.H.; Dagley, C.M. Modeling Young Stand Development towards the Old-Growth Reference Condition in Evergreen Mixed-Conifer Stands at Headwaters Forest Reserve, California. Forests 2013, 4, 455-470.

AMA Style

Berrill J-P, Beal CB, LaFever DH, Dagley CM. Modeling Young Stand Development towards the Old-Growth Reference Condition in Evergreen Mixed-Conifer Stands at Headwaters Forest Reserve, California. Forests. 2013; 4(2):455-470.

Chicago/Turabian Style

Berrill, John-Pascal; Beal, Christopher B.; LaFever, David H.; Dagley, Christa M. 2013. "Modeling Young Stand Development towards the Old-Growth Reference Condition in Evergreen Mixed-Conifer Stands at Headwaters Forest Reserve, California." Forests 4, no. 2: 455-470.


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