Established operational plantations were examined to determine the effect of burning and mechanical site preparation on growth and nutrition of planted white spruce. Growth and nutrition of planted white spruce near the Willow and Bowron Rivers, east of Prince George, have been dramatically affected by prescribed burning. Five growing seasons after planting, unburned areas had an average leader length 36% lower and concentrations of foliar N, active Fe, and Cu 27, 66, and 41% higher, respectively. At the McLeod Lake plots, north of Prince George, which were burned in 1967, no relationship of growth or nutrition of spruce with levels of burn impact was found in a group of plots which varied in stock type, time of planting, drainage, soil parent material, slope, and aspect. In plots where these factors were similar, foliar N and Cu and soil mineralizable N were positively correlated with residual duff depth and negatively correlated with the extent of bare mineral soil. Total tree height and 1983 leader length were negatively correlated with residual duff depth and positively correlated with the extent of bare mineral soil. Near Boomerang Lake, spruce growth and foliar concentrations of several nutrients were significantly higher within burned windrows than in the scalped areas between windrows. In lodgepole pine, foliar concentrations of several nutrients, although not necessarily the same nutrients, were higher within than between windrows. At Carp Lake, in areas where alder has invaded scalped areas between windrows. N status of spruce foliage and current height growth of spruce exceeded those of areas between windrows with no alder, and were comparable to those within the burned windrows. These results suggest the potential usefulness of shrubby alder in silviculture on sites in central interior British Columbia that have low levels of nitrogen.
436 (Nützliche Wirkungen des Feuers. Verwendung des Feuers in Waldbau und Landwirtschaft [Dieser Titel kann am besten unterteilt werden durch Kreuzverweise, z.B.: Brennen zur Vorbereitung natürlicher Verjüngung 436 : 231.322; Brennen zur Vorbereitung künstlicher Verjüngung 436 : 232.213; Planmäßiges Abbrennen (“controlled burning”) zur Verminderung der Feuergefahr 436 : 432.16; Brennen zur Bekämpfung von Pilzkrankheiten 436 : 443 usw.] [Dieser Titel kann am besten unterteilt werden durch Kreuzverweise, z.B.: Brennen zur Vorbereitung natürlicher Verjüngung 436 : 231.322; Brennen zur Vorbereitung künstlicher Verjüngung 436 : 232.213; Planmäßiges Abbrennen (“controlled burning”) zur Verminderung der Feuergefahr 436 : 432.16; Brennen zur Bekämpfung von Pilzkrankheiten 436 : 443 usw.]) 237.1 (Bodenbearbeitung) 561 (Zuwachs an Höhe, Durchmesser, Grundfläche, Form und Qualität) 174.7 (Coniferae [Siehe Anhang D]) [71] (Kanada)
