Sentences with phrase «upper soil»

For the southern US / Mexico, even precipitation and upper soil levels exhibit predictive skill of up to 2 — 3 years (Fig. 8d).

The decrease in juvenile earthworms in the conventional plots can be explained by the fact that upper soil layers are their preferred habitat.

Bay muds often have a high organic content, consisting of decayed organisms at lower depths, but may also contain living creatures when they occur at the upper soil layer and become exposed by low tides; then, they are called mudflats, an important ecological zone for shorebirds and many types of marine organisms.

The compaction decreases downward water flow through the soil, drying out the upper soil layers, Resner and her colleagues found.

And in the sugar maple forests near the Great Lakes, the churning worms actually compact the upper soil layers instead of loosening them, Resner said.

«To better compare the GPR signal against the measured root values from the soil cores, radar profiles were sectioned with the most signal concentrated on the upper soil layer for further analysis,» Dong said.

When the upper soil structure is too weak to support a wind tower foundation, driven piles offer a deep foundation solution.

They replicated natural seasonal thaws of the upper soils, and the deep and long - term thaw of the permafrost.