substrate data from Mt Moosilauke

This dataset contains extension growth data for seedlings, measured in 1988, 1989, 1998, and 1999. There was also some additional data collected in 2000 about the health status of some of the tagged seedlings. Seedling information from this dataset is linked to 'segplants' by the ID variable.

extgr

An object of class data.table (inherits from data.frame) with 32998 rows and 12 columns.

ID: Unique plant identifier, links to other seedling data in segplants.
EX: Extension growth measurements (cm). The number of measurements recorded during a given census varied, refer to detailed notes.
YEAR: Year of measurement.
YRREX: Indicator variable: 1 means data after this year can be trusted. This was determined by taking into account browsed/broken tops of plants and new leaders in subsequent years.
PEX: Indicator variable: 1 if the measurement is "partial growth", meaning the measurement was taken partway through that year. Recorded in 1989, 1998, and 1999.
NL: Indicator variable: 1 if a new leader emerged that year (this was only measured in 1999).
TERM: Notes on the condition of the terminal leader (recorded in 1999, and 2000).
AGE: Estimated total age of plants (only measured in 1988).
MINAGE: Estimated minimum age of plants (recorded in 1988, 1989, 1998, and 1999).
D1RM: Distance remaining from the last positively identified extension growth to the root collar of ABBA/PIRU seedlings (recorded in 1998 and 1999, see detailed notes).
D2RM: Distance remaining after accounting for the minimal age of ABBA/PIRU seedlings (recorded in 1998 and 1999, see detailed notes).
ENOTE: Indicator variable for various conditions of terminal leader:
- 1: New leader
- 2: Browse off, no ext. growth
- 3: Not browsed, just no growth.
- 4: Dead top
- 5: No dominant leader