Shrub expansion may reduce summer permafrost thaw in Siberian tundra Blok, D. ; Heijmans, M. M. P. D. ; Schaepman-Strub, G. ; Kononov, A. V. ; Maximov, T. C. ; Berendse, F. Abstract Publication: Global Change Biology Pub Date: April 2010 DOI: 10.1111/j.1365-2486.2009.02110.x Bibcode: 2010GCBio..16.1296B