Physical Sciences and Mathematics Commons^™

Planting Trees-Why Rather Than How, Angelo Cohn

Journal of the Minnesota Academy of Science

Three evergreen plantings over 25 years in a private woodland are described and evaluated in terms of reforestation, economics and personal satisfaction. Credit is given to government foresters and support from the Minnesota Department of Natural Resources (DN\R) and the federal Forest Incentives Program (FIP). Changes in site preparation methods, selection of species and planting procedures are discussed as outcomes of research and field experience. Cost-benefits are assigned principally to human values reflected in family learning and enhanced appreciation of the ecosystem of rural Minnesota.

Identification Of Cosmic Particles 3695 Mev/C2 And 3105 Mev/C2, Frank H. Meyer, Ronald W. Satz

Journal of the Minnesota Academy of Science

No abstract provided.

Till Fabrics And Pedoturbations In Some Soils Of Minnesota, Gerald W. Mccormick

Journal of the Minnesota Academy of Science

Till-fabric analyses provide an index of pedoturbation for soils formed in till. This analysis of four soils in east-central Minnesota shows that pedoturbation has had little or no effect upon the orientations of pebbles in B2 horizons and ambiguous effects in the B 1 and A2 horizons. Effects of frost action are not apparent.

A Study Of Vertical And Horizontal Visibility Relationships Under Water, Jean J. Mccarthy

Journal of the Minnesota Academy of Science

A threefold study was undertaken to:

1) determine the nature of the mathematical relationship between vertical and horizontal visibility underwater

2) examine the feasibility of using the Secchi disc method to measure horizontal visibility in the photic zone;

3) obtain descriptive data on vertical and horizontal visibility in selected lakes of southern Minnesota.

The Secchi disc technique for measuring· visibility was modified to accommodate horizontal readings, and data were col1lected from 12 lakes at 5, 15 and 25 feet depths under controlled conditions. Reliability correlations were significant (p ( .01) and ranged from .764 to .994. Correlations and regression equations …

Interplanetary Magnetic Field Sector Polarity And Neuropsychiatric Adaption: A Reanalysis, Hans W. Wendt

Journal of the Minnesota Academy of Science

Recent Russian studies reported associations between adaptation syndromes and (solar activity-related) interplanetary magnetic field (IMF) sector polarity. Certain ambiguities in the original work suggested some reanalyses, based on the graphs and data made available. Syndrome status exhibited a biphasic (semi annual) trend. It also correlated with specific geomagnetic changes during magnetic storms and possibly after sudden impulses. Moreover, lag effects and higher order interactions were noted among all parameters investigated. The restudy tends to support some of the original findings but also suggests new conclusions regarding potential relationships between geophysical/solar and psychophysiological processes.

A Program To Re-Establish And Study Prairie Grassland And Assess Effect Of Fire, Lee W. Eberley, Keith H. Dueholm

Journal of the Minnesota Academy of Science

Two plots in southeastern Minnesota were seeded with several species of prairie vegetation . Grasses native to the prairie proliferated, while some foreign species failed to survive. Fire was used on one plot to stimulate the native species and reduce competition from cool-season grasses. Additional planting of forbs will be attempted to increase species diversity on the plots. Burning also will be continued to determine the effect of fire on the vegetation.

Critical Areas Planning In Minnesota, Clifton J. Aichinger

Journal of the Minnesota Academy of Science

The Critical Areas Planning Program was established by Minnesota legislation in 1973. Its primary work is with local units of government, regional or state agencies located within areas possessing significant natural, scientific, cultural or historical resources to develop consistent plans and regulations for area use and management. Local units of government prepare the plans and regulations according to guidelines approved by the governor for each critical area'. with technical and financial assistance from the Environmental Quality Board (EQB). The enabling act directed the EQB to develop an inventory of potential critical areas in the state. Inventory methods were evaluated. The …