Selecting FIA data

For initial exploration of the data, we will first get FIA plots from AL, AR, FL, GA, LA, NC, MS, SC, TN, TX, and VA. We are downloading data directly from DataMart for most up to date information. Please modify the above states as necessary. We are then subsetting to the Longleaf / slash pine forest type and Loblolly / shortleaf pine group. We excluded AR and TN since there wasn’t any data for Longleaf in those states and ecosections.

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 of Longleaf forest types

Forest transitions over time

Breakdown of growth rates and mortality rates

Harvest Likelihoods by forest subtypes within Longleaf / slash pine group

Using the Best Practices formula but with avg time between measurement dates rather than invyr

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\(\color{forestgreen}{\text{For Longleaf pine natural stands, the harvest likelihood over 20 years is: 25.85%}}\)

\(\color{forestgreen}{\text{For Longleaf pine planted stands, the harvest likelihood over 20 years is: 78.29%}}\)

Map of FIA plots within Longleaf forest sub types

Make a map of proportion of plots harvested in a Unit

Map of disturbances over time

A closer look at types of harvest within Longleaf forest sub types

Histograms of Previous BAA across Longleaf forest sub types

\(\color{red}{\text{For Longleaf pine, the mean BAAC for all plots is **84.9 sqft/acre** and the mean for harvested plots is **114.41 sqft/acre**.}}\)

\(\color{red}{\text{For Longleaf/oak, the mean BAAC for all plots is **87.83 sqft/acre** and the mean for harvested plots is **104.6 sqft/acre**.}}\)

Change in BAA across Longleaf forest sub types

Percent TPA removed

Diameter classes across forest types

Determine plots that were recently commercially thinned (Longleaf)

Determine plots that were recently commercially thinned (Loblolly)

Investigate transitions from Loblolly to Longleaf in more depth