Selecting FIA data

For initial exploration of the data, we will first get FIA plots from NC and SC. We are downloading data directly from DataMart for most up to date information. A harvest is defined as either a 10 in the TRTCD1 column and/or 25% BA removed per acre without any other disturbance reported.

To clean the data, we are only selecting FIA data that was measured in 1997 or later, when annualized data began. Finally, we are selecting plots that:

1. Have accessible forestland
2. Are single condition class
3. Are of Bottomland Hardwood forest sub types (i.e., “Sweetbay/swamp tupelo/red maple”, “Sweetgum/Nuttall oak/willow oak”, or “Baldcypress/water tupelo” - https://www.srs.fs.usda.gov/pubs/gtr/gtr_srs217.pdf)

Understanding Harvest likelihood/frequency over 20-year timeframe for Bottomland Hardwoods

\(\color{forestgreen}{\text{For Bottomland Hardwoods, the harvest likelihood is: 20.1%}}\)

Map of FIA plots

Change in BAA by forest type

\(\color{red}{\text{For Bottomland Hardwoods, the overall average rate of removal for all harvested plots is **86 %**.}}\)

Harvest behaviors by change in QMD

Initial Carbon Gains Estimates for Bottomland Hardwoods

Based on 20% Harvest likelihood in 20 years and 86% average harvest intensities

\(\color{forestgreen}{\text{The gross carbon gains are: 1.48 +/- 0.16%}}\)

\(\color{forestgreen}{\text{The net carbon gains are: 1.21 +/- 0.13%}}\)

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\(\color{red}{\text{Gross refers to the overall additionality of a Let it grow type practice above the Business-as-usual. }}\)

\(\color{red}{\text{Net includes discounts for leakage (10%), permanence (18%), and uncertainty (10%).}}\)