Forest Investment Account (FIA) - Forest Science Program
FIA Project Y081073

    Natural Regeneration, Mortality and Residual Growth Response 25 Years after Partial Cutting on the Coast
Project lead: de Montigny, Louise (BC Ministry of Forests and Range)
Subject: Forest Investment Account (FIA), British Columbia
Series: Forest Investment Account (FIA) - Forest Science Program
An invaluable asset to the province is a continuing source of high quality data on the long-term effect of silviculture treatments and management regimes on stand and tree growth and development. The Coastal Stand Management Field Experiments Program, part of the Provincial Growth and Yield Program, uses statistically sound experimental design and high technical standards for establishing and remeasuring Experimental Projects (EPs). The result is that these EPs are the best means of providing high value long-term data needed to answer questions about appropriate treatments levels and growth responses following treatment (Marshall, 1991). There are a large number of Provincial coastal growth and yield research experiments, and these have been assessed and ranked in terms of their ability to provide quality data. The resulting Coastal GY Field Experiments program consists of only those experiments and installations that can provide high quality data and achieve their treatment response objectives. This LOI is for the remeasurement of about 500 plots from 20 EPs over three years and its inclusion into the Research Branch GY database and the Provincial GY Program. The data will be collected according to provincial standards (Forest Productivity Council, 1999) by qualified contractors under an invitation to tender process and the cleaned data loaded into the Research Branch GY relational database. This LOI will also undergo the analysis and reporting on the 25 year response of growth, regeneration and mortality from intermediate and partial cutting throughout the coast. Experimental Project 703, Extensive Studies of Fertilizing and Thinning was initiated in 1971 to investigate the growth response of Douglas-fir and western hemlock at three levels of fertilization and three levels of thinning in a replicated, factorial design. Although the experiment was meant to examine effects of thinning in pure stands, in fact, the treatments ranged from 20 to 50% basal area removal across mixed species stands varying in age from 15 years to 75 years and can be used to assess response of partial cutting with high retention, especially in situations where extended rotations are desirable. The experiment originally encompassed 940 permanent plots located at 85 installations throughout coastal BC. Of the original 85 installations, 62 have been highly ranked for importance to the program and most of these high priority installations have had their 8th measurement. In addition to tree diameter, height and condition codes, data has been collected on pre-treatment forest conditions, tree ages, crown width, pathological indicators, site information, soil texture, nutrients and moisture regimes, foliar nitrogen, on-site weather stations, understorey vegetation, mortality and ingrowth. The data from this experiment is the single, largest source of data for coastal stands in BC and has provided the most important validation and calibration data for second-growth coastal hemlock and Douglas-fir. The data has been used by research organizations and consultants in BC, the Pacific northwest, and internationally. It has been used to model the spread and effects of root rot over time, effects of fertilizing and thinning, stand development, crown response and other projects that require long-term tree measurement data. The analysis proposed here, will provide the first ever look at 25 year dynamics across the range of installations.
Related projects:  FSP_Y092073FSP_Y103073
Contact: de Montigny, Louise, (250) 387-3295,


Executive Summary (16Kb)

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Updated August 16, 2010 

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