Iowa Research

IOWA RESEARCH

See abstract by Radke and Berry for more details.

Drilling holes with a tractor mounted post-hole auger for installation of casings.

Six-inch PVC casings installed in holes prior to installation of soil columns.

Installing five-inch soil columns inside of the outer casings. CRREL frost-depth tube is visible in the center of the picture.

Removing a soil column for sampling.

Removing unfrozen soil in 5-cm layers from the bottom of a soil column with a special auger.

Frozen top portion of a soil column showing earthworm burrows and a frozen earthworm prior to sectioning.

Technician Paul Doi with chop saw used to cut the frozen soil into 5-cm sections.

Five-cm section of frozen soil showing part of an earthworm burrow.