Treesearch

The distribution of Minnesota's commercial forest land among ownership classes has remained stable between 1962 and 1977. This note summarizes commercial forest ownership data by Forest Survey Unit for 1962 and 1977 and presents more detailed area statistics for Minnesota's 17 northern countries.

The effects of cutting diameter on early survival and growth of several Populus clones were studied in field tests in Wisconsin and Michigan. Generally, large diameter cuttings survived and grew better than small diameter cuttings. Response differences among clones were evident.

Trees for reclamation can mean many things to different people. Understandably, the primary thrust of this symposium is the use of trees in the reclamation of lands formerly and currently mined for coal. This is a worthy goal, one that the Southeastern Area, State and Private Forestry, earnestly supports. My discussion today, however, will not focus specifically on the reclamation of coal (other minerals) mined lands, but will include them as a part of the potential forest land base in need of reclamation which can contribute to the nation's growing appetite for wood fiber.

This report reviews TVA program efforts to promote the use of wildlife shrubs in mined-land reclamation including work on plant materials development, demonstrations to acquaint landowners with a variety of food and cover plants, and action programs to incorporate wildlife plants into postmining land use. It deals briefly with wildlife considerations under Public Law 95-87 and the wildlife seedling needs and supply problem.

Rabbit droppings and grasshoppers were collected on recently graded coal mine spoil to determine if they were vectors of endomycorrhizal fingi. After 6 weeks of growth, roots of rye grass and sudan grass grown in mixtures of sterilized sand containing either unsterilized rabbit droppings or grasshoppers were endomycorrhizal, while the roots of plants grown in sterilized mixtures of those were not.

Data archives and data banks have become increasingly important as more researchers begin to examine trends. Characteristics of data banks, sources of bias in secondary data sources and important trends in data banks are described. The paper concludes with advice about using data banks.

Reports height and diameter growth of tamarack seed sources planted in northern Wisconsin and makes recommendations for selecting the highest-yielding sources.

Shows stocking density has little effect on wood specific gravity of red pine

Presents statistics on Minnesota's forest land area by country for 1977

The maple cambium miner, Phytobia setosa (Loew), attacks Acer spp., producing ray flecks which result in degrade in face veneer and furniture wood. Samples from infested sugar maple, Acer saccharum Marsh, trees demonstrated that while mines passed close to the vascular cambium the initial cells were not affected. Thus, although it is called a cambium miner it does not mine the cambium. Mines filled with parenchyma cells which proliferated from severed vascular rays. These cells, when mature, stored starch. In heavily infested trees the starch storage area in the xylem may thus be measurably...