Selecting FIA data

For initial exploration of the data, we will first get FIA plots from ID. 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.

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 not reserves
3. Are single condition class
4. Are of Fir/Spruce/Mountain hemlock, Hemlock/Sitka spruce, or Aspen/Birch forest types

Harvest Likelihoods by forest type

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

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\(\color{forestgreen}{\text{For Fir / spruce / mountain hemlock group the harvest likelihood is: 18.01%}}\)

\(\color{forestgreen}{\text{For Hemlock / Sitka spruce group the harvest likelihood is: 47.75%}}\)

\(\color{forestgreen}{\text{For Aspen / birch group the harvest likelihood is: 26.91%}}\)

Breakdown of FIA plots

Map of FIA plots

Make a map of proportion of plots harvested in a Unit

Histograms of Previous BAA across forest types

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\(\color{red}{\text{For Fir / spruce / mountain hemlock group, the mean BAAC for all plots is **66.65 sqft/acre** and the mean for harvested plots is **39.63 sqft/acre**.}}\)

\(\color{red}{\text{For Hemlock / Sitka spruce group, the mean BAAC for all plots is **136.2 sqft/acre** and the mean for harvest plots is **131.68 sqft/acre**.}}\)

\(\color{red}{\text{For Aspen / birch group, the mean BAAC for all plots is **159.72 sqft/acre** and the mean for harvest plots is **156.16 sqft/acre**.}}\)

Histograms of Previous QMD across forest types

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\(\color{red}{\text{For Fir / spruce / mountain hemlock group, the mean QMD for all plots is **13.12in** and the mean for harvested plots is **6.99in**.}}\)

\(\color{red}{\text{For Hemlock / Sitka spruce group, the mean QMD for all plots is **13.67in** and the mean for harvest plots is **12.35in**. }}\)

\(\color{red}{\text{For Aspen / birch group, the mean QMD for all plots is **11.61in** and the mean for harvest plots is **10.6in**. }}\)

Change in BAA by forest type

Change in QMD after harvest

Harvest behaviors by change in QMD

Percent TPA removed