1. Preface

   • R. F. Huettl

   EditorialNotes Pages: 205 - 207

2. Changes in chemistry and mineralogy of forest soils by acid rain

   • Nicola Rampazzo
   • Winfried E. H. Blum

   Special Section Pages: 209 - 220

3. Acid deposition in the German solling area: Effects on soil solution chemistry and Al mobilization

   • E. Matzner
   • J. Prenzel

   Special Section Pages: 221 - 234

4. Soil acidification along a topographic gradient on Roundtop Mountain, Quebec, Canada

   • W. H. Hendershot
   • F. Courchesne
   • R. S. Schemenauer

   Special Section Pages: 235 - 242

5. Influence of acid deposition on element cycling in mature sugar maple forest, Algoma, Canada

   • I. K. Morrison
   • N. W. Foster
   • J. A. Nicolson

   Special Section Pages: 243 - 252

6. Timing, magnitude, and impact of acidic deposition on sensitive forest sites

   • Walter C. Shortle
   • Ernest A. Bondietti

   Special Section Pages: 253 - 267

7. Simulated acid rain effects on fine roots, ectomycorrhizae, microorganisms, and invertebrates in pine forests of the southern United States

   • R. J. Esher
   • D. H. Marx
   • D. C. Coleman

   Special Section Pages: 269 - 278

8. Effects of acidic precipitation, fertilization and liming on the ground vegetation in coniferous forests of southern Germany

   • H. Rodenkirchen

   Special Section Pages: 279 - 294

9. Nitrogen cycling in two Norway spruce (Picea abies) ecosystems and effects of a (NH₄)₂SO₄ addition

   • K. H. Feger

   Special Section Pages: 295 - 307

10. Effects of air pollutants on mineral nutrition of Norway spruce and revitalization of declining stands in Austria

    • K. Katzensteiner
    • G. Glatzel
    • H. Sterba

    Special Section Pages: 309 - 322

11. Response to a smelter closure in Cascade mountain lakes

    • E. B. Welch
    • D. E. Spyridakis
    • L. C. Duncan

    Regular Section Pages: 325 - 338

12. A model for the critical hourly concentration, receptor distance and meteorological conditions from point sources with thermal plume rise

    • Alexander P. Economopoulos

    Regular Section Pages: 339 - 363

13. A model for the impact of soil solution Ca: Al ratio, soil moisture and temperature on tree base cation uptake

    • H. Sverdrup
    • P. Warfvinge
    • Kaj Rosén

    Regular Section Pages: 365 - 383

14. Sampling and analysis of the soil fumigants 1,3-dichloropropene and methyl isothiocyanate in the air

    • F. Van Den Berg
    • M. Leistra
    • L. G. M. Th. Tuinstra

    Regular Section Pages: 385 - 396

15. Dissolved and particulate-adsorbed hydrocarbons in the waters of shatt al-Arab River, Iraq

    • Hassan M. Bedair
    • Hamid T. Al-Saad

    Regular Section Pages: 397 - 408