EDITOR’S NOTE: Superiorland Yesterdays is prepared by the reference staff at the Peter White Public Library in Marquette.
30 years ago
HOUGHTON — Acid rain is washing essential minerals off leaves and branches of hardwood trees, forest researchers say. A group of scientists from the forestry department of Michigan Tech University, Michigan State University, and the University of Michigan report that acid rain dripping through the forest canopy removes calcium, potassium, and magnesium from northern hardwoods. Those chemicals are essential to the growth and productivity of the forests, sad Hal Liechty, an MTU research scientist. The acidity in precipitation is caused by hydrogen, nitrates and sulfates released from burning fossil fuels. Calcium, magnesium and potassium leached from the trees by acid rain may not be absorbed in the soil and could be lost from the ecosystem. “If this happens, it could lead to changes in the mix of tree species in the forests, health problems with the trees, and eventually a general decrease in the productivity of the forests,” Liechty said. The relationship between pollution and increased chemical leaching from trees has also been indicated in controlled laboratory experiments, but Liechty said field testing is more accurate than testing in a greenhouse because of all the effects of the natural setting can be takin into consideration.
60 years ago
ISHPEMING — The annual Upper Peninsula Moose Convention will be held here Friday, Saturday and Sunday, beginning with registration at 4 Friday afternoon. Harold Kretsinger, state regional director, will be toastmaster at a dinner to be held at 6 Saturday evening. Earl Horton, supreme conservation director of Moosehart, Ill., will be the main speaker at the dinner and Mayor Theodore Mattson is expected to make a few comments. Entertainment has been planned for 10 p.m. Friday and Saturday.