Science - October 4, 2011
Shrubs obstruct permafrost thaw
Tundra shrubs can obstruct permafrost thaw caused by climate change, research by PhD candidate Daan Blok shows.

Readjust
However, this theory has to be readjusted based on Blok's research into the effect of the dwarf birch, the most common shrub on the Siberian tundra, at the thaw depth. He cleared small experimental tundra fields of dwarf birch trees. He then monitored the thaw depth throughout two summers and measured the various energy streams between the atmosphere and the soil.