1. Nitrogen Cycles: Past, Present, and Future

   • J. N. Galloway
   • F. J. Dentener
   • C. J. Vöosmarty

   OriginalPaper Pages: 153 - 226

2. Long-term effects of elevated nitrogen on forest soil organic matter stability

   • Christopher Swanston
   • Peter S. Homann
   • Phillip Sollins

   OriginalPaper Pages: 229 - 252

3. Net N input and riverine N export from Illinois agricultural watersheds with and without extensive tile drainage

   • G.F. McIsaac
   • Xuetao Hu

   OriginalPaper Pages: 253 - 273

4. Distribution of carbon isotope composition of modern soils on the Qinghai-Tibetan Plateau

   • Houyuan Lu
   • Naiqin Wu
   • Tungsheng Liu

   OriginalPaper Pages: 275 - 299