Preface. Biodiversity and Ecosystem Approaches. A Hierarchical Approach to Evaluating the Significance of Soil Biodiversity to Biogeochemical Cycling; M.H. Beare, D.C. Coleman, D.A. Crossley, P.F. Hendrix, E.P. Odum. Mutualism and Biodiversity in Soils; P. Lavelle, C. Lattaud, D. Trigo, I. Barios. The Detritus Food-Web and the Diversity of Soil Fauna as Indicators of Disturbance Regimes in Agro-Ecosystems; D.A. Wardle, G.W. Yeates, R.N. Watson, K.S. Nicholson. Microbial Population Dynamics. Patterns and Regulation of Mycorrhizal Plant and Fungal Activity; E.B. Allen, M.F. Allen, D.J. Helm, J.M. Trappe, R. Molina, E. Rincon. Processes that Maintain Local Species Diversity of Ectomycorrhizal Fungi; T.D. Bruns. Soil Microbial Diversity and the Sustainability of Agricultural Soils; A.C. Kennedy, K.L. Smith. The Functional Significance of Microbial Biomass in Organic and Conventionally Managed Soils; M.M. Wander, D.S. Hendrick, D. Kaufman, S.J. Traina, B.R. Stinner, S. Kehermeyer, D.C. White. Fatty Acid Methyl Ester (FAME) Profiles as Measures of Soil Microbial Community Structure; M.A. Cavigelli, G.P. Robertson, M.J. Klug. Discrimination of Microbial Diversity by Fatty Acid Profiles of Phospholipids and Lipopolysaccharides in Differently Cultivated Soils; L. Zelles, R. Rackwitz, Q.Y. Bai, T. Beck, F. Beese. Effects of Previous Intensive Agricultural Management on Microorganisms and the Biodiversity of Soils; J. Filser, H. Fromm, R.F. Nagel, K. Winter. Divergence of Mycorrhizal Fungal Communities in Crop Production Systems; J.W. Hendrix, B.Z. Guo, Z.-Q. An. Biodiversity and Species Redundancy among Litter Decomposers; O. Andren, J. Bengtsson, M. Clarholm. The Role of Glutamine Synthetase in Regulation of Nitrogen Metabolism within the Soil Microbial Community; G.W. McCarthy. Cellulose Degrading Fungi in Soil; R.E.J. Boerner, J. Rebbeck. Decomposition and Nitrogen Release from Leaves of Three Hardwood Species Grown under Elevated O3 and/or CO2; L.R. Durrant, E. Canale-Parola, S.B. Leschine. Interpreting Soil Ciliate Biodiversity; S.B. Bamforth. Soil Faunal Relationships. Measures of Nematode Community Structure and Sources of Variability among and within Agricultural Fields; D.A. Neher, S.L. Peck, J.O. Rawlings, C.L. Campbell. Analysis of Nematode Trophic Structure in Agroecosystems: Functional Groups versus High Resolution Taxonomy; R.W. Parmelee, P.J. Bohlen, C.A. Edwards. Relationships among Microarthropods, Fungi, and Their Environment; J.N. Klironomos, B. Kendrick. The Spatial Heterogeneity of Soil Invertebrates and Edaphic Properties in an Old Growth Forest Stand in Western Oregon; C.E. Torgersen, J.A. Jones, A.R. Moldenke, M.P. LeMaster. Population Dynamics and Functional Roles of Enchytaeidae (Oligochaeta) in Hardwood Forest, and Agricultural Ecosystems; P.C.J. van Vliet, M.H. Beare, D.C. Coleman. How Do Earthworms Affect Microfloral and Faunal Community Diversity? G.G. Brown: Earthworm Community Structure and Diversity in Experimental Agricultural Watersheds in Northeastern Ohio; P.J. Bohlen, W.M. Edwards, C.A. Edwards. Earthworm Population Size, Composition, and Microbial Biomass: The Effect of Pastoral and Arable Management in Canterbury, New Zealand; R.J. Haynes, P.M. Fraser, P.H. Williams. Leaf Litter Decomposition and Microarthropod Abundance along an Altitudinal Gradient; C.M. Hoover, D.A. Crossley Jr.