6USDA Forest Service.FIA Program Components FIA Fact Sheet Series[DB/OL].Available from http://fia.fs.fed.us/library/fact-sheets/overview/PgmComponentsFs.pdf.2003-09-01.
7FIA.Program Structure for Forest Inventory and Monitoring FIA Fact Sheet Series[DB/OL].Available from http://fia.fs.fed.us/library/fact-sheets/overview/PgmStructureFs.pdf.2003-09-31.
8USDA Forest Service.FIA National Core Field Guide(Ⅰ)Field Data Collection Procedures for Phase 2 Plots:Version 2.0[DB/DL].Available from http://fia.fs.fed.us/library/field-guides-methods-proc/docs/corever2-00104.pdf.2005-05-25.
9USDA Forest Service.FIA National Core Field Guide(Ⅰ)Phase 3 Field Guides[DB/OL].Available from http://fia.fs.fed.us/library/field-guides-methods-proc/docs/p3sec9e02-03final.pdf.2005-05-25.
