Constructor for S3 defol class
Arguments
- year
 An n-length integer vector of observation years
- series
 An n-length factor or character vector of series names
- gsi
 An n-length numeric vector of growth suppression index, such as calculated by
gsi()- ngsi
 An n-length numeric vector of normalized gsi, such as calculated by
gsi().- defol_status
 An n-length factor or character vector denoting the defoliation event status of each year. This uses a controlled vocabulary, see
dfoliatR:::make_defol_statusfor possible values.
