|
|
Active
Layer 25
" H x 25" W Embroidery
on silk and velvet
The portion of the soil above permafrost that thaws and freezes seasonally
is the active layer.
It plays an important role in cold regions because most ecological, hydrological,
biogeochemical and soil forming activity takes place within it. Changes
in active layer thickness are invluenced by many factors including surface
temperature, physical and thermal properties of the surface cover and substrate,
vegetation, soil moisture and duration and thickness of snow cover.
|
|