NWT RESEARCH DATABASE

Principal Investigator: Nichols, Harvey
Licensed Year(s): 1993
Summary: Tree-line plant species are sensitive to changes in climate. Most trees growing in the tree-line reproduce by `layering' which means that they do not produce seeds but instead the tree limbs of individual trees produce roots to generate another `tree'. Seeds can only be produced when the summer climate is warm enough. By monitor- ing the reproduction of trees in the tree-line, information can be...

Principal Investigator: Pearce, Cheryl M.
Licensed Year(s): 1993 1992 1991 1990
Summary: The researcher will complete the intensive sampling of the Arctic Coastal Plain west of Shallow Bay on the Mackenzie River Delta to the Alaska border, where tundra surfaces could differ from those east of the Mackenzie Delta, high arctic tundra on northern Cape Bathurst, and additional treeline sites between Inuvik and the Horton River....

Principal Investigator: Olsen, Sue K.
Licensed Year(s): 1992
Summary: The experiment will determine the interacting effects of fire severity, soil moisture and air temperature treatments on the emergence, winter survival and initial growth of treeline and near treeline tree species. The availability and viability of tree seed for successful regeneration of the treeline and near-treeline tree species will also be determined....

Principal Investigator: Landhaeusser, Simon M.
Licensed Year(s): 1992 1991 1990
Summary: To determine the maximum size of treeline tree species in a burned and unburned valley in the Caribou Hills, the mass of standing trees on different slopes and aspects will be estimated and related to the energy input. In 1992 the plots prepared in 1990 and planted and seeded in 1991, will be revisited and measurement of growth for the second growing season will be taken....

Principal Investigator: MacDonald, Glen M
Licensed Year(s): 1992 1990
Summary: Dr. Glen MacDonald and his team will collect lake sediment core samples from 3 or 4 small lakes in the Mackenzie Mountains, adjacent to the Canol Road for the purpose of fossil pollen and macrofossil analysis. The area will be revisited in July to conduct surveys of vegetation at and around the treeline....

Principal Investigator: Luckman, B.H.
Licensed Year(s): 1989
Summary: Dr. Luckman and one assistant will look for potential sites for the Geological Survey of Canada to study global change. They will also obtain recent tree-ring chronologies from treeline sites in the Mackenzie Delta....

Principal Investigator: MacDonald, Glen M
Licensed Year(s): 1987
Summary: To use fossil pollen and plant macrofossils from small lakes to reconstruct the response of plant populations in the treeline zone to climatic change. Modern pollen surface samples from small lakes in the treeline zone will be collected to aoid in the interpretation of the fossil pollen samples. The study area will include the boreal forest, forest-tundra and tundra zones near Yellowknife (115 W...

Principal Investigator: Wills-Adkins, Betty
Licensed Year(s): 1982
Summary: To sample shrubs near tree-line in order to asses the value of dendrochronological techniques in determining climatic variations....

Principal Investigator: Timoney, Kevin P.
Licensed Year(s): 1982
Summary: To better understand the ecology of the treeline. Objectives include: determination of the treeline width, description of geographic variation and vegetation pattern change with treeline fluctuations....

Principal Investigator: Jacoby, Jr., Gordon C.
Licensed Year(s): 1978
Summary: To collect 1/2 inch diameter core samples from old, climatically - sensitive trees at or near the northern tree line....