Site preparation for establishing lodgepole pine in the sub-boreal spruce zone of interior British Columbia: the Bednesti trial, 10-year results

Bedford, Lorne; Sutton, R. F.

doi:10.1016/s0378-1127(99)00090-0

Cited by 43 publications

(43 citation statements)

References 4 publications

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“…However, several studies have shown that significant growth differences (both positive and negative) three to five years following soil disturbances are either no longer detectable or have been reversed at 10 to 20 years following disturbance (e.g., Wass and Senyk 1999). In a site preparation study in northern British Columbia, Bedford and Sutton (2000) found a general convergence of annual increments among site preparation treatments after nine years. Therefore, prediction of changes in long-term productivity based on five-year-growth data could be misleading.…”

Section: Discussionmentioning

confidence: 97%

Soil disturbance and five-year tree growth in a montane alternative silvicultural systems (MASS) trial

Maynard¹

2004

The Forestry Chronicle

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Ground-based forestry practices can negatively affect soil productivity by altering the physical, chemical, and biological properties of soil. The effect of soil disturbance on soil properties and tree growth was evaluated following single-pass hydraulic excavator and multiple-pass combined excavator and flexible track grapple skidder forwarding in four silvicultural systems treatments: Clearcut (CC), Green Tree Retention (GT), Patch Cut (PC), and Uniform Shelterwood (SW). The effectiveness of an excavator soil-rehabilitation technique (tilling) in decompacting skidtrails (i.e., reducing soil bulk density) and nutrient availability was also evaluated. Western hemlock (Tsuga heterophylla (Raf.) Sarg.) and amabilis fir (Abies amabilis Dougl. Ex. Forbes) seedlings were planted on undisturbed plots, within tracks and between tracks of skidtrails, and in rehabilitated trails within the four harvesting treatments in the spring of 1994. Seedling growth was measured after five growing seasons, and nutrient concentrations of current-year foliage were determined at the end of the fourth growing season. Seedling survival and growth was generally reduced by soil disturbances associated with skidtrails. Effects of disturbance on physical properties of soil (e.g., compaction, puddling) and disruption of drainage were the most likely causes. Nutrient deficiencies do not appear to be a factor. Nonetheless, nitrogen concentrations were lower in current-year foliage taken from rehabilitation treatments than from either undisturbed or skidtrail treatments. Effectiveness of soil rehabilitation varied. In well-drained deeper soils, tilling reduced soil bulk density to levels below those of undisturbed soils and, in the short-term (five years), improved tree growth. In wetter conditions, rehabilitation treatment decreased survival and growth of both species. Thus specific rehabilitation (tilling) prescriptions should not be universally applied across a landscape.Key words: Abies amabilis, Tsuga heterophylla, foliar analysis, soil bulk density, soil compaction, soil rehabilitation Les pratiques forestières sur le terrain peuvent altérer de façon négative la productivité pédologique en modifiant les propriétés physiques, chimiques et biologiques du sol. L'effet de la perturbation du sol sur les propriétés pédologiques et la croissance des arbres ont été éval-ués suite à un passage d'une excavatrice hydraulique et de plusieurs passages combinés de l'excavatrice et d'une débardeuse à grappin sur chenilles flexibles dans le cadre de quatre traitements sylvicoles : coupe à blanc (CC), rétention d'arbres verts (GT), coupe par trouée (PC) et coupes progressives uniformes (SW). L'efficacité d'une technique de réhabilitation des sols au moyen d'une excavatrice (labourage) pour décompacter les sentiers de débardage (c'est-à-dire, réduire la densité globale du sol) et la disponibilité des élé-ments nutritifs ont été évaluées. Les semis de pruche de l'Ouest (Tsuga heterophylla (Raf.) Sarg.) et de sapin amabilis (Abies amabilis Dougl. Ex. Forbes) ...

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Section: Discussionmentioning

confidence: 97%

Soil disturbance and five-year tree growth in a montane alternative silvicultural systems (MASS) trial

Maynard¹

2004

The Forestry Chronicle

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“…Site preparation and the management of competing vegetation are of primary importance for the successful growth and survival of conifers in the northern regions of Canada (e.g., [1][2][3]). Improvements in seedling survival and growth during the first 10 years after planting following site…”

Section: Introductionmentioning

confidence: 99%

Yield Implications of Site Preparation Treatments for Lodgepole Pine and White Spruce in Northern British Columbia

Cortini

Comeau

Boateng

et al. 2010

Forests

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Abstract:We evaluated the effects of site preparation treatments on growth of lodgepole pine and white spruce in north-eastern British Columbia, Canada. These treatments can provide yield gains of up to 10 percent for lodgepole pine and white spruce at 60 and 80 years, respectively (estimated using TASS). Stands of these two species are showing a Type 1 response. Using growth multipliers, based on measurements collected at ages 10 to 20 results in inflated estimates of potential yield responses while the age-shift method provides the most appropriate estimates of yield gains when measured during the first 20 years of growth.

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“…Rapid juvenile growth as a result of treatments such as mechanical site preparation in lodgepole pine produced high early growth rates, but did not translate into faster growth than control treatments, once the stands reached crown closure (Bedford and Sutton 2000).…”

Section: Site Indexmentioning

confidence: 90%

Linking juvenile growth of white spruce with site index

Zhang¹,

Stadt²,

Lieffers³

et al. 2006

The Forestry Chronicle

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The goal of this study was to link the growth of juvenile white spruce stands with an estimate of their site index. We applied a previously developed technique for correcting the height bias created by dominance switching among juvenile trees before trees reached the site index base age (50 years at breast height), using stem analysis data of white spruce from five mixedwood stands in central Alberta. For white spruce of approximately 15 years total age, we found the height of the current top height trees was approximately 14% greater than the height of the top height trees that would be selected close to breast height age 50. This height correction is essential to avoid an overestimate of site index. Secondly, to avoid the difficulties of determining breast height age or growth increment required for juvenile site index determination, we developed a linkage to site index using data from 168 white spruce trees that were longitudinally sectioned along the pith, selected from juvenile (age 6-15) spruce stands. Using this new equation, coupled with the correction for bias, we found that site index for white spruce from 49 test stands in Alberta, ranged from 9.0 to 31.8 m at base age 50, with a mean of 17.8 m; these values are in the range for spruce in mixedwood stands in Alberta.

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Site preparation for establishing lodgepole pine in the sub-boreal spruce zone of interior British Columbia: the Bednesti trial, 10-year results

Cited by 43 publications

References 4 publications

Soil disturbance and five-year tree growth in a montane alternative silvicultural systems (MASS) trial

Soil disturbance and five-year tree growth in a montane alternative silvicultural systems (MASS) trial

Yield Implications of Site Preparation Treatments for Lodgepole Pine and White Spruce in Northern British Columbia

Linking juvenile growth of white spruce with site index

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