model.lange.customize {barrks}R Documentation

Customize the Lange model

Description

This page describes the parameters that can be used to customize Lange. The model was developed by Lange et al. (2008). Look here to find out how to apply the model.

Arguments

dd_onset_start_date

The date, when the degree days start to sum up ('MM-DD').

dd_onset_base

Base temperature to calculate degree days to trigger the onset.

dd_onset_threshold

Degree days that are required to trigger the onset of infestation. Additionally, the maximum temperature must exceed tfly.

tfly

Minimum temperature that beetles need to fly.

dd_base_stages

Base temperatures to calculate degree days for the different stages in the following order: egg, larva, pupa, juvenile adult.

dd_threshold_stages

Thermal thresholds for the different stages in the following order: egg, larva, pupa, juvenile adult.

model_end_date

Date when the model ends (no further development will be modeled).

first_lethal_date

Date before which no mortality will be modeled.

tlethal

Temperature threshold below which white stages (egg, larva, pupa) will die.

Details

In barrks, model() is used to customize a model. The following code illustrates which parameters are available for the Lange model and specifies their default values.

model("lange",

      # ==== onset ==== #

      dd_onset_start_date = '01-01',
      dd_onset_base = 5,
      dd_onset_threshold = 110,

      # ==== onset + development ====

      tfly = 19.5,

      # ==== development ==== #

      dd_base_stages = c(10.6, 8.2, 9.9, 3.2),
      dd_threshold_stages = c(51.8, 204.4, 57.7, 238.5),

      model_end_date = '12-31',

      # ==== mortality ==== #

      first_lethal_date = '09-01',
      tlethal = 0
)

References

Lange H, Økland B, Krokene P (2008). “To be or twice to be? The life cycle development of the spruce bark beetle under climate change.” In Unifying Themes in Complex Systems: Proceedings of the Sixth International Conference on Complex Systems, 251–258. Springer. doi:10.1007/978-3-540-85081-6_32.

See Also

model(), phenology(), model.lange.apply

Other model customizations: model.bso.customize, model.chapy.customize, model.joensson.customize, model.phenips.customize, model.phenips_clim.customize, model.rity.customize


[Package barrks version 1.0.0 Index]