Understory vegetation in young Douglas-fir forests: does thinning help restore old-growth composition?

Lindh, Briana C.; Muir, Patricia S.

doi:10.1016/j.foreco.2004.01.018

Cited by 86 publications

(76 citation statements)

References 41 publications

(48 reference statements)

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“…Lindh and Muir [78] found that thinning dense 20-year-old Douglas-fir stands had a positive impact on the frequency of late-seral herbs 20 years later. On the other hand, Ares et al [79] found that richness of early seral herbs and shrubs increased but late-seral herb response was minor six years after thinning in 40-to 60-year-old Douglas-fir stand.…”

Section: Discussionmentioning

confidence: 99%

Structural Equation Modeling: Theory and Applications in Forest Management

Lam

Maguire

2012

International Journal of Forestry Research

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Forest ecosystem dynamics are driven by a complex array of simultaneous cause-and-effect relationships. Understanding this complex web requires specialized analytical techniques such as Structural Equation Modeling (SEM). The SEM framework and implementation steps are outlined in this study, and we then demonstrate the technique by application to overstory-understory relationships in mature Douglas-fir forests in the northwestern USA. A SEM model was formulated with (1) a path model representing the effects of successively higher layers of vegetation on late-seral herbs through processes such as light attenuation and (2) a measurement model accounting for measurement errors. The fitted SEM model suggested a direct negative effect of light attenuation on late-seral herbs cover but a direct positive effect of northern aspect. Moreover, many processes have indirect effects mediated through midstory vegetation. SEM is recommended as a forest management tool for designing silvicultural treatments and systems for attaining complex arrays of management objectives.

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Section: Discussionmentioning

confidence: 99%

Structural Equation Modeling: Theory and Applications in Forest Management

Lam

Maguire

2012

International Journal of Forestry Research

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“…It is possible especially only in an original or natural forest where developmental processes not disturbed by primary anthropogenic activities are taking place (Tabaku 2000). In most cases it is admissible or desirable to assist the nature by suitable close-to-nature management (Lindh & Muir 2004). It will shorten the time to achieve the target situation when the forest can be fully left to spontaneous development in line with the requirements for nature conservation ( Bebber et al 2005;Götmark 2009).…”

Section: Introductionmentioning

confidence: 99%

Structure and dynamics of spruce-beech-fir forests in Nature Reserves of the Orlické hory Mts. in relation to ungulate game

Vacek

2017

Central European Forestry Journal

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Knowledge of the structure and dynamics of near-natural mixed forests is a key factor for ecologically oriented management of forest ecosystems. The development of these model forests mostly takes place continually without any pronounced disturbances. Natural regeneration can be locally limited by ungulate browsing. The paper was focused on the structure and development of forest stands with emphasis on natural regeneration in relation to ungulates in Černý důl Nature Reserve and Trčkov National Nature Reserve situated in the Orlické hory Mts., Czech Republic. The case study was conducted in a spruce-beech-fir forest stand on four permanent research plots (PRP) of 0.25 ha in size. PRP are situated in the same stand and in comparable site and stand conditions, but two PRP has been protected against game by fencing since [1985][1986][1987][1988][1989]. The stand volume ranged from 478 to 565 m 3 ha −1 in age 143 -156 year. The results showed that the diversity of tree layer was higher by 19.8% (48.0% in species richness) in the stands protected by fence. In the phase of natural regeneration, the species composition, stand structure and number of recruits were poorer on unfenced PRP (7,990 recruits ha ). Admixed silver fir and rowan were completely eliminated by browsing (to 94 -100% of individuals). Growth analyses statistically confirmed that ungulates were a significant limiting factor for successful forest development (P < 0.001).

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“…For this purpose, a network of representative forest reserves was selected in the Czech Republic, and appropriate management principles were formulated based on long-term studies [16,17]. Many authors recommend active management during the transition period before the forest is left to be regulated by natural processes [18], which should shorten the time necessary to reach the target state [19][20][21]. These recommendations are often restricted to silvicultural operations, such as thinning, selection harvest or enrichment planting, while the impact of ungulates is often neglected or underestimated.…”

Section: Introductionmentioning

confidence: 99%

Ungulate Impact on Natural Regeneration in Spruce-Beech-Fir Stands in Černý důl Nature Reserve in the Orlické Hory Mountains, Case Study from Central Sudetes

Vacek

Bílek

et al. 2014

Forests

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Abstract:The paper presents the results of a study on tree regeneration of forest stands in the Černý důl Nature Reserve, which is situated in the Orlické hory Mountains Protected Landscape area in the Czech Republic. Research was conducted in a spruce-beech stand with an admixture of silver fir, sycamore maple and rowan on two comparative permanent research plots (PRPs) (PRP 1-fenced enclosure and PRP 2-unfenced). Typological, soil, phytosociological and stand characteristics of the two PRPs are similar. The results showed that ungulate browsing is a limiting factor for successful development of natural regeneration of autochthonous tree species. The population of tree species of natural regeneration on the fenced plot (PRP 1) is sufficient in relation to the site and stand conditions. However, natural regeneration on PRP 2 is considerably limited by browsing. Damage is greatest to fir, sycamore maple and rowan; less severe to beech; and the least to spruce. OPEN ACCESSForests 2014, 5 2930

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Understory vegetation in young Douglas-fir forests: does thinning help restore old-growth composition?

Cited by 86 publications

References 41 publications

Structural Equation Modeling: Theory and Applications in Forest Management

Structural Equation Modeling: Theory and Applications in Forest Management

Structure and dynamics of spruce-beech-fir forests in Nature Reserves of the Orlické hory Mts. in relation to ungulate game

Ungulate Impact on Natural Regeneration in Spruce-Beech-Fir Stands in Černý důl Nature Reserve in the Orlické Hory Mountains, Case Study from Central Sudetes

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