Selecting FIA data

For initial exploration of the data, we will first get FIA plots from NY, MA, NH, VT, and ME. 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 ecosections 211, 221, 222, and M221. Again, please modify as necessary.

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 of private ownership
4. Are single condition class
5. Are greater than or equal to 2000 gross BF per acre (initial)
6. Are of Maple/Beech/Birch or Oak/Hickory forest types
7. Are natural stands (not planted stands)

Breakdown of FIA plots

Map of FIA plots

Make a map of proportion of plots harvested in a Unit

It is by unitcd by I couldn’t figure out how to bold the unit areas unfortunately

Histograms of Previous BAA across forest types

The dotted red line represents the MSU cap (62.5)

For MBB, the mean BAAC for all plots is 101.9 sqft/acre and the mean for harvested plots is 96.1 sqft/acre.

For OH, the mean BAAC for all plots is 110.3 sqft/acre and the mean for harvest plots is 103 sqft/acre.

Histograms of Previous QMD across forest types

The dotted red line represents the MSU cap (7)

For MBB, the mean QMD for all plots is 10.2in and the mean for harvested plots is 9.9in.

For OH, the mean QMD for all plots is 10.5in and the mean for harvest plots is 10.3in.

RD removed and Change in BAA by forest type

The mean RD % removed for MBB is 36.1% and for OH is 24.7%.

Change in QMD after harvest

Harvest behaviors by change in QMD

Percent TPA removed