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No major changes have been made. In 2008-2009 we plan to measure 4 edge sites: 5521 (Port McNeill), 1706 China Creek and Branch 90 (3253) (both Port Alberni), and 3015 (South Island). We will measure natural regeneration at experimental site OP38250. The planted and retained trees were measured here in 2007-2008 but due to very high regeneration amounts exceeding available funding and planned time and with the occurrence of snowfall this measurement will be delayed until the spring of 2008. We will also measure experimental site LL55 (Stillwater). In addition we plan to update analyses with the new measurements: we are examining the impacts of edges on planted and natural regeneration. Work will continue with the linkage of the variable retention regeneration model being embedded in the FORGE model (see below) via model updates and testing.
Increased retention of trees in openings leads to increased edges compared to clearcuts. This study is designed to examine the effects of retained forest edge on the growth of regenerating trees in Coastal BC using two permanent plot data sets. This project specifically extends the similar project Y082001 in two areas: to a larger data set and includes significant data analysis.
Experimental design: 1) Seven large scale (~100 ha) and three smaller scale (~40ha) experimental sites (all treatments randomly allocated) have been established across Western Forest Products landbase (Beese et al. (2005)). 2) Nineteen edge sites have been established across the former Weyerhaeuser BC Coastal Group?s landbase.(See attachments).
The experimental sites were established on homogenous areas, have clearcut and uncut controls and up to 3 treatments comprised of different types and levels of variable retention (Beese et al. 2005). Categories are group retention, group size, dispersed retention, group removal and mixed retention. There are generally 3 treatments per site from low to higher levels of retention, and an uncut and a clearcut area, all randomly allocated. Within these experimental areas permanent long-term ?sector plots? (Iles and Smith 2006, Smith et al. 2008) have been established to examine the effects of forest edge on growth. In dispersed experiments, clearcuts and uncut areas 0.1ha ?sector? plots with a central angle of 36 degrees are established randomly. For group retention or group removal treatments four 9 degree sectors tied to a central 'pivot-point' are established with random angles in a minimum of 3 patches per treatment. At each experiment plots generally cover about 2ha. Each site permanently monitors 3000- 5000 planted trees, 2000+ tagged natural regeneration trees and 500-2500 retained trees measured on a 1,2,3,5,8 and 10 year cycle. Edge sites were generally set up before the experimental sites: their purpose was to explicitly examine trends in responses in planted trees and natural regeneration to forest edge environmental gradients. Plots were established in N, S, E and W directions. At least 3, and up to 6 rows of trees were planted from -5m to +50m across forest edges and measured on a 1,2,3,5,8 and 10 year cycle. (In some years it is not possible to measure planted and natural regeneration in the same year due to funding constraints or weather limitations at higher elevations. In this case the missed category will be measured in the following year). Two sites examined different species in the same transect (5521 and 5409 both at Port McNeill). There were 4 species planted in each transect in random rows (Sitka spruce, amabilis-fir, western red cedar and western hemlock). Three sites (Melrose 12, RatDog and Nanaimo Lakes) included fertilizing at treatment comparisons: 3 rows were unfertilized and 3 were fertilized. Both the edge and experimental sets of data are long-term (20 years+).
Note that requested funds will only cover a portion of the actual cost for these sites; in-kind funding will make up the short-fall. We also request assistance with funding a full d ...
Forest Investment Account (FIA). 2009. Effects of variable retention on planted and natural regeneration in Coastal BC: data measurement and analysis. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2009MR451
Topic: FLNRORD Research Program
Keywords: Forest, Investment, Account, (FIA), British, Columbia
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