47 research outputs found
Post-Algonquin and Post-Nipissing Forest History of Isle Royale, Michigan
Isle Royale, the largest island in our Great Lakes, is located in the northwestern part of Lake Superior, 50 miles nw. of the Keweenaw Peninsula, 20 miles se. of the Canadian mainland, and 19 miles east of Grand Portage, Minnesota. Maximum elevation is 1300 feet, but most of the higher center ridge does not exceed 1,000 feet. Present altitude of Lake Superior is 602 feet
Pollen frequency of Abies and Picea in peat: A correction on some published records from Indiana bogs and lakes
An error was introduced in a number of reports on pollen profiles from Indiana bogs and lakes because Picea and Abies were separated on basis of size as presented in a key by Sears, which included only Picea mariana but not Picea glauca
The vegetation of Round Island (Straits of Mackinac), Michigan
The vegetation of Round Island was studied briefly during the summers of 1935 and 1936 while an extensive survey was in progress on Mackinac Island
Survival of hemlock seedlings in a relict colony under forest conditions
It would thus appear that in areas where hemlock is a component of the climax, and not merely a relict, reproduction is dependent primarily upon a combination of three factors, viz. a good seed year followed by a good germinating year and these in turn followed by several years of favorable moisture conditions
An ecological survey of Berkey woods: A remnant of forest primeval in Kosciusko county, Indiana
In July 1942, we published results of a detailed study of Cox Woods, a remnant of forest primeval in Orange county, located in southern Indiana. In the present study we place on record quantitatively a relatively undisturbed stand of forest in the northern part of Indiana
Secondary Succession in Stands of Red Maple - Sweet Gum - Beech Forests in Ripley County, Indiana
The vegetation of the leached Illinoian till plain has been described in detail by Braun, Keller, McCoy, and the progress of secondary succession in these habitats has been considered quantitatively by Potzger and Potzger, and in a more general way by Chapman. Realizing the insecure accuracy of empirical field impressions, the present quantitative study of seven stands on Illinoian till plain forests in the process of developing either from lumbering distrubance or from cleared land was undertaken
Forest succession in the Trout Lake, Vilas county, Wisconsin area: A pollen study
The present paper is another chapter in the study of vegetational history of the Vilas county, Wisconsin neighborhood, stressing this time the area immediately adjacent to Trout lake, which as a whole is controlled by Pinus, and revolved in a Pinus dominance to the present time