1. Methane emission from tidal freshwater marshes

   • Frans-Jaco Van der Nat
   • Jack J. Middelburg

   OriginalPaper Pages: 103 - 121

2. Dissolved organic nitrogen budgets for upland, forested ecosystems in New England

   • John L. Campbell
   • James W. Hornbeck
   • Gene E. Likens

   OriginalPaper Pages: 123 - 142

3. Modeling the hydrochemistry of the Choptank River Basin using GWLF and Arc/Info: 1. Model calibration and validation

   • Kuang-Yao Lee
   • Thomas R. Fisher
   • Donald E. Weller

   OriginalPaper Pages: 143 - 173

4. Regulation of soil phosphatase and chitinase activityby N and P availability

   • Lydia P. Olander
   • Peter M. Vitousek

   OriginalPaper Pages: 175 - 191