1. Carbon and nitrogen limitations of soil microbial biomass in desert ecosystems

   • Antonio Gallardo
   • William H. Schlesinger

   OriginalPaper Pages: 1 - 17

2. Effects of nitrogen: phosphorus supply ratios on nitrogen fixation in agricultural and pastoral ecosystems

   • Val H. Smith

   OriginalPaper Pages: 19 - 35

3. Soil surface CO₂ flux in a Minnesota peatland

   • Joon Kim
   • Shashi B. Verma

   OriginalPaper Pages: 37 - 51