Laboratory Methods:

• Bray's Method for Soil P Extracton
• Wet Ash for Ca, Mg and K
• Chloroform Fumigations
• Diffusion Protocol for 15N/14N by Mass Spec.
• Kjeldahl Digest
• Lignin
• Potassium Chloride Extracts
• Soil Phosphorus Resin Bags
• Total Phenolics and Proanthocyanidins
• Urease Protocol
• Enzyme Assays for Fresh Litter and Soil

Computer Models

• Nitrogen Fixation
• EnzModel - Source code for EnzModel: microbial enzyme production in spatially structured environments. In Word format by Steve Allison.
• Nfixwater - This file is designed to evaluate the effects of rainfall and rainfall variation on N inputs (including fixation) and outputs, on 15N natural abundance, and on the openness of N cycling across moisture gradients.
  It is modified extensively from Nfix15, which the Biogeochemistry Nfix/CO2 paper is based on, especially to make sure production and decomposition occur in the same simulated year.