Table Of Content

Contents Volume 57, 1993 Invited papers Interrelationships between soil structure/texture, soil biota/soil organic matter and crop production Gas, water and solute transport in soils containing macropores: a review of methodology W.M. Edwards, M.J. Shipitalo and L.B. Owens Simulation modelling as a method to study land qualities and crop productivity related to soil structure differences J. Bouma and M.J.D. Hack-ten Broeke Contributed papers Modelling the geometry of worm burrow systems in relation with oxygen diffusion C. Rappoldt Relationships amongst organic matter content, heavy metal concentrations, earthworm activity, and soil microfabric on a sewage sludge disposal site A.D. Tomlin, R. Protz, R.R. Martin, D.C. McCabe and R.J. Lagace Relationships between soil texture, physical protection of organic matter, soil biota, and C and N mineralization in grassland soils J. Hassink, L.A. Bouwman, K.B. Zwart, J. Bloem and L. Brussaard A method for the three-dimensional mapping of earthworm burrow systems T.N. Ligthart, G.J.W.C. Peek and E.J. Taber Water movement, oxygen supply and biological processes on the aggregate scale P.A. Leffelaar Round tables Round Table on water movement, oxygen supply, nutrient supply, and biological processes on the micro-scale R.P.A.C. Raats Translation of soil features across levels of spatial resolution — Introduction to round table discussion R.J.F.Th. Schoute Editorial Discussion Paper and Comments Soils as biotic constructs favouring net primary productivity N. Van Breemen The soil as a model for the Earth AB RN cscs sect cessd ance caveat I lv ehiccsa v ba sha dnabdascicsednacecadsasenascensaaiasendacacsacios 213 Response: a pedologist perspective on soils as biotic constructs favouring net primary productivity Bia OIE ID 5 os ses cdo csctassscececceencecaasdessoucesecsacesekqacantcemtencncasctecksicesassteaddesechsndave 217 The evolutionary basis of biogeochemical soil development Pea oo os 0 ag aan cv clapc ada nann casa ntbens coacenedeacuctaackepeentcuossresenbeaassantckesnnasn s 223 Author’s epilogue N. van Breemen 478 CONTENTS VOLUME 57, 1993 Research Papers Prediction of dynamic hydraulic properties in a ripening soil D.J. Kim, J. Feyen and H. Vereecken Reducing variance in soil organic carbon estimates: soil classification and geostatistical approaches R. Yost, K. Loague and R. Green Structural investigations of humic acid from leonardite by spectroscopic methods and thermal analysis G. Ricca, L. Federico, C. Astori and R. Gallo Variations in weathering processes and rates with time in a chronosequence of soils from Glen Feshie, Scotland D.C. Bain, A. Mellor, M.S.E. Robertson-Rintoul and S.T. Buckland Stages and rate of the gravel shattering process by salts in desert Reg soils R. Amit, R. Gerson and D.H. Yaalon Book Review Bodenchemie by W. Ziechmann and U. Mueller-Wegener — J.P.G. Loch Research Papers A quantitative Australian approach to medium and small scale surveys based on soil stratigraphy and environmental correlation N.J. McKenzie and M.P. Austin Critical conditions for rill initiation on sandy loam Brunisols: laboratory and field experiments in southern Ontario, Canada W. Merz and R.B. Bryan A method for identifying soil catenas and determining map unit composition used in a reconnaissance soil survey in Tanzania B.D. Acres, M.A. Green and L.J. Rackham An examination of the Guelph permeameter for measuring the soil’s hydraulic properties A.P. Salverda and J.H. Dane Andisol formation in a Holocene beach ridge plain under the humid tropical climate of the Atlantic coast of Costa Rica A. Nieuwenhuyse, A.G. Jongmans and N. Van Breemen Soil development on the 1888 Bandai mudflow deposits in Japan K. Morisada and Y. Ohsumi Current Titles in Soil Science Announcements