Browsing by Subject "aspen"
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Item An Analysis of Selected Production Alternatives for the Utilization of Minnesota Aspen(Minnesota Agricultural Experiment Station, 1974) Bowyer, James L.Item Aspen response to forest soils amended with municipal and industrial by-products on two Northern Minnesota sites : experimental design and preliminary results(University of Minnesota, 2002-10) Cavaleri, Molly A; Gilmore, Daniel W; Mozaffari, Morteza; Rosen, Carl J; Halbach, Thomas R; Mathison, Russell D; O'Brien, Timothy CThe utilization of municipal and industrial by-products as forest soil amendments can improve forest soil fertility. In this field study, aspen (Populus tremuloides Michx.) seedlings were planted at two forested sites (Itasca and Carlton counties) amended with treatments of biosolids, boiler ash, and inorganic agricultural fertilizers. Experimental treatments included biosolids at rates equivalent to 70, 140, 210, and 280 kg available N ha-1, two types of boiler ash (application rates based on % Effective Neutralizing Power), boiler ash plus biosolids, and an untreated control. Preliminary results are reported for soil properties, aspen seedling survival, height, and caliper. Soil pH decreased with increased N application from both biosolids and fertilizer sources, but increased through additions of boiler ash and lime. Soil P increased with increased biosolids and ash application rates. Soil K increased with ash and K fertilizer applications. No differences were detected in aspen seedling survival among treatments at the conclusion of the first and second growing seasons at either installation. Height differences among treatments were detected through ANOVA in 2000 and 2001, but were inconclusive. Aspen height and caliper growth in Carlton County was greater than in Itasca County.Item Influence of logging, fire, and forest type on biodiversity and productivity in southern boreal forests(Ecological Society of America, 2001) Reich, Peter B; Bakken, Peter; Carlson, Daren; Frelich, Lee E; Friedman, Steve K; Grigal, David FThe effects of logging on ecosystem sustainability are controversial. Surprisingly, existing data are inadequate to allow a comprehensive evaluation of logging effects on biodiversity, composition, and productivity since appropriate comparisons of stands of similar ages and differing disturbance histories are rare. We addressed this issue using a study of 2000 plots in 80 southern boreal forest stands in northern Minnesota, USA, wherein we contrasted naturally regenerated aspen (Populus tremuloides), jack pine (Pinus banksiana), and black spruce (Picea mariana) stands established following logging or the dominant natural disturbance, wildfire, for stands of two age classes (25-40 and 70-100 yr old). For young stands, those established postlogging had higher vascular plant diversity than those postwildfire. Otherwise, we found no evidence of differing species diversity (including canopy tree, shrub, herbaceous, and bryophyte species), composition, productivity, or nitrogen cycling, in forest stands of comparable age and forest type that originated after logging compared to after wildfire. These variables, however, differed significantly among forest types, with aboveground net primary productivity and plant species diversity generally higher in aspen than jack pine stands, even when growing on comparable soils, and lowest in black spruce. Although there is evidence that logging has increased the proportional landscape dominance by aspen, a forest type with higher diversity, nutrient cycling, and productivity than other types, our evidence refutes the idea that disturbance by logging has diminished stand-scale productivity or plant diversity in comparison to the common natural disturbance, wildfire.Item Soil Factors Affecting the Growth of Quaking Aspen Forests in the Lake States(Minnesota Agricultural Experiment Station, 1960-01) Stoeckeler, Joseph H.