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Effect of young stand silviculture on conifer/broadleaf mixtures in seral ICH forests of Southern Interior BC Simard, Suzanne W.
2007
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Abstract: This project fits the FSP 'Timber Growth and Value' program, '1.0 Basic Research on tree growth and stand development' theme and '1.1 Complex stands' topic. The combination of six fully replicated conifer/paper birch mixtures experiments on sixteen different sites in young stands within the Interior Cedar Hemlock and Interior Douglas-fir zones of the southern interior represents an extensive research program. The six experiments are: 1) Regeneration of birch/conifer mixtures (established in 1992), 2) Site preparation for Armillaria root disease (established in 1992), 3) Crop-tree response to brushing at various radii (established in 1995), 4) Birch/Douglas-fir thinning study (established in 1999), 5) Birch/spruce thinning study (established in 1992), 6) Birch/Douglas-fir vegetation management study (established in 1986). Objectives and Methods: The FSP project in 2004/05 includes four of these integrated studies, all of which are designed to provide information about effects of management practices on interspecific interactions, growth and yield, stand development, and ecosystem function in conifer/broadleaf forests of the southern interior wet-belt. Following is a brief description of the four component studies: a) Site Preparation Study ? The specific objectives are: (1) to determine the effects of different intensities of stumping and soil disturbances on long-term changes in soil physical and nutrient properties, and long-term growth of lodgepole pine, hybrid spruce, and paper birch; and (2) to identify causal relationships between soil properties altered by disturbance and long-term growth of different species. The study is in the ICHmw subzone and uses a randomized block design with three replicate sites (Adams, Malakwa, and Hidden Lake) and four treatments (control, stumps inverted in place, stumps carefully removed, stumps and forest floor removed). Each treatment plot is further split into three tree species (lodgepole pine, interior spruce, and paper birch). In 2004/05, we planned to collect 10-year soil chemical and bulk density samples at one of the three sites (the other two sites had already been sampled). We were to collect samples for determination of bulk density and total C, N, and S, available P, and pH. Five composite samples per plot were collected for soil chemistry and 10 individual samples per plot for bulk density within each of the 24 sub-plots throughout the site. Foliar nutrient samples will also be collected from 30 trees per subplot. This new data will be combined with existing 10-year data and analyzed using ANOVA and ANCOVA, where appropriate, to test for differences in soil physical and chemical properties between silviculture treatments. Relationships between soil properties and forest productivity will be investigated using multiple regression and multivariate techniques. b) Soil Transfer Study ? The specific objectives of this experiment are: (1) to determine the effects of soil transfer from different forest tree species on growth and survival of planted Douglas-fir and paper birch, and on soil chemical and microbial characteristic, (2) to determine the effect of grass removal on survival and growth of Douglas-fir seedlings, and (3) to determine the effect of painting the root collar on mortality and sunscald of paper birch. This study was established at Malakwa on a single study site that had experienced repeated plantation failure for the past 12 years. Three blocks were installed at the site in 2002 and an equal mix of Douglas-fir and paper birch was planted. Four treatment factors were applied in a 2x3x2x2 factorial design. The treatment factors/levels were: species (Douglas-fir or paper birch); soil inoculum (none, soil transferred from beneath a mature birch tree, or soil transferred from Douglas-fir); grass competition (all vegetation completely removed from a 1 m x 1m plot centered on the planted tree, or no vegetation removed); and sun scald protection (protection or no protect ...
 
Simard, Suzanne W., Hope, Graeme D.; Vyse, Alan; Hagerman, Shannon M.; Sachs, Donald L.; Heineman, Jean L.; Mather, W. Jean; Zimonick, Barbara J.. 2007. Effect of young stand silviculture on conifer/broadleaf mixtures in seral ICH forests of Southern Interior BC. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2007MR425
 
Topic: FLNRORD Research Program
Keywords: Forest, Investment, Account, (FIA), Forest, Management, British, Columbia, Interior, Site, Preparation
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