The soil environment / Dominic Standing and Ken Killham -- Microbial phylogeny and diversity in soil / Vigdis Torsvik and Lise Ovreas -- Horizontal gene transfer and microevolution in soil / Kaare M. Nielsen, Pal Johnsen, and Jan Dirk van Elsas -- The bacteria and archaea in soil / Jan Dirk van Elsas, Vigdis Torsvik, Anton Hartmann, Lise Ovreas, and Janet K. Jansson -- The fungi in soil / Roger D. Finlay -- Protozoa and other protista in soil / Marianne Clarholm, Michael Bonkowski, and Bryan Griffiths -- Microbial interactions in soil / Jan Dirk van Elsas, Ling Tam, Roger D. Finlay, Ken Killham, and Jack. T. Trevors -- Plant-associated bacteria : lifestyle and molecular interactions / Jan Sorensen and Angela Sessitsch -- Microorganisms cycling soil nutrients and their diversity / Jim I Prosser -- Soil microbial communities and global climate change : methanotrophic and methanogenic communities as paradigms / Ralf Conrad --^