Links

Long-Term Soil Productivity Research: A Program in Sustaining Forest Ecosystems
United States Department of Agriculture Forest Service FS-714 September 2001 ...
www.fs.fed.us/research/pdf/SoilProd.pdf

USDA Forest Service National Soils Program
http://www.fs.fed.us/biology/soil/

The Croatan National Forest Long Term Soil Productivity study:
http://www.rtp.srs.fs.fed.us/soils/research/croatobj.htm

Jack Pine Ecosystem Productivity Project
http://www.glfc.forestry.ca/science/research/jp_eco_prod_project_e.html