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Schmelz, Damian V.; Lindsey, Alton A.
doi: 10.1093/forestscience/11.3.258pmid: N/A
Stand attributes of 19 old-growth hardwood stands in the midwest are compared; bottomland stands range up to 199 sq ft and upland ones up to 152 sq ft in basal area per average acre. Number of stems per acre when plotted on semi-logarithmic paper according to size-class distribution gave no perfectly straight line, characteristic of a balanced distribution. Four patterns of configuration were recognized: (1) a nearly straight line indicative of relatively little stand disturbance, (2) a sharp break in the line indicative of severe disturbance at the particular size classes, (3) a curve characterized by a plateau indicative of significant recovery after disturbance, and (4) a line with a widely deviating negative slope indicative of a later stage in recovery. A straight line, fitted to the data by the least squares method, was interpreted to represent the overall present condition of the stand. Estimates of the undisturbed condition were made by comparing various portions of the line connecting the plotted points with the regression line. The coefficient of determination was taken as an index of the degree of disturbance in the stand. Comparison of the same stand before and after a 10-year interval supported conclusions derived from comparing different stands.
Schmelz, Damian V.; Lindsey, Alton A.
doi: 10.1093/forestscience/11.3.258pmid: N/A
Stand attributes of 19 old-growth hardwood stands in the midwest are compared; bottomland stands range up to 199 sq ft and upland ones up to 152 sq ft in basal area per average acre. Number of stems per acre when plotted on semi-logarithmic paper according to size-class distribution gave no perfectly straight line, characteristic of a balanced distribution. Four patterns of configuration were recognized: (1) a nearly straight line indicative of relatively little stand disturbance, (2) a sharp break in the line indicative of severe disturbance at the particular size classes, (3) a curve characterized by a plateau indicative of significant recovery after disturbance, and (4) a line with a widely deviating negative slope indicative of a later stage in recovery. A straight line, fitted to the data by the least squares method, was interpreted to represent the overall present condition of the stand. Estimates of the undisturbed condition were made by comparing various portions of the line connecting the plotted points with the regression line. The coefficient of determination was taken as an index of the degree of disturbance in the stand. Comparison of the same stand before and after a 10-year interval supported conclusions derived from comparing different stands.
doi: 10.1093/forestscience/11.3.265pmid: N/A
Two isolates of Polyporus tomentosus and one of P. tomentosus vat. circinatus did not form mycorrhizae on either white spruce or red pine in a sterilized nutrient-sphagnum-sand medium in flasks. Seedling roots developed lesions in the flasks and died following heavy cortical infections by these fungi which were still alive and vigorous at the end of the experiment. Similar seedlings inoculated with mycorrhizal tips developed ectotrophic mycorrhizae with typical Hatrig nets and thin mantles on both tree species.
doi: 10.1093/forestscience/11.3.265pmid: N/A
Two isolates of Polyporus tomentosus and one of P. tomentosus vat. circinatus did not form mycorrhizae on either white spruce or red pine in a sterilized nutrient-sphagnum-sand medium in flasks. Seedling roots developed lesions in the flasks and died following heavy cortical infections by these fungi which were still alive and vigorous at the end of the experiment. Similar seedlings inoculated with mycorrhizal tips developed ectotrophic mycorrhizae with typical Hatrig nets and thin mantles on both tree species.
doi: 10.1093/forestscience/11.3.271pmid: N/A
Balsam fir bark was cultured aseptically on a nutrient medium. When β-inhibitor was added to the agar medium, extreme hypertrophy of phloem parenchyma and ray cells occurred. This hypertrophy gave rise to a conspicuous swelling which resembled the bark malformations, known as 'gout disease', caused by the balsam woolly aphid.
doi: 10.1093/forestscience/11.3.271pmid: N/A
Balsam fir bark was cultured aseptically on a nutrient medium. When β-inhibitor was added to the agar medium, extreme hypertrophy of phloem parenchyma and ray cells occurred. This hypertrophy gave rise to a conspicuous swelling which resembled the bark malformations, known as 'gout disease', caused by the balsam woolly aphid.
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