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FIA Plot Locations for Soil Carbon Assessment

This research aims to determine the average soil organic carbon by forest type using FIA plots on STATSGO soils. The new approach overlays STATSGO with forest cover from plots to improve accuracy. However, obtaining the necessary data has proven challenging, leading to delays and potential limitations in the research approach.

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FIA Plot Locations for Soil Carbon Assessment

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  1. FIA Plot Locations for Soil Carbon Assessment • Objective: determine average soil organic carbon by forest type (w/ std. dev.) • SOC calculated from STATSGO soil map data • Old Approach: overlay STATSGO w/ forest cover map derived from satellite • Avg. for ME: 24.8 kg/m2 • Problem: map only agrees with FIA forest type 33%! • New Approach: overlay STATSGO w/ forest cover from plot • Avg. for ME: 7.0 kg/m2

  2. FIA Plot Locations for Soil Carbon Assessment FIA plots on STATSGO soils

  3. FIA Plot Locations for Soil Carbon Assessment • What do we need? • Table containing: • FIA PlotID • STATSGO MUID (soil unit identifier) • Why? • Use STATSGO data table: SOC by MUID (for several approaches, several depths) • Use FIA Plot table: forest type group, acreage expansion factor • Need the new table to cross-reference and summarize data • Problem- can’t get it

  4. FIA Plot Locations for Soil Carbon Assessment • Why can’t we get it? • If an MUID contains FIA plots from fewer than three owners, can’t get it. • If an MUID is small enough to contain only one plot, can’t get it. • If a forest type falls on only one MUID, can’t get it. • Result: • Research delayed • Less control over process • Less confidence in results • Not repeatable • Not verifiable • Not a workable research approach

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