chilling_units: Chilling units (Harrington _et al._, 2010)

In EduardoFernandezC/dormancyR: Functions to Compute Chill Metrics

Chilling units (Harrington et al., 2010)

Description

Function to calculate winter chill for deciduous trees according to the Chilling Units model proposed by Harrington et al. (2010). This function is compatible with some chillR functions (i.e tempResponse) to estimate metrics from hourly temperature records.

Usage

chilling_units(HourTemp, summ = TRUE)

Arguments

HourTemp	Vector of hourly temperatures
summ	Boolean parameter indicating whether the computed metric should be provided as cumulative values over the period or as the actual accumulation for each hour

References

Harrington C., Gould P. and St.Clair J. (2010). Modeling the effects of winter environment on dormancy release of Douglas-fir. For. Ecol. Manage. 259(4): 798-808. https://doi.org/10.1016/j.foreco.2009.06.018

Examples

library(chillR) 

#Example 1

data <- stack_hourly_temps(KA_weather, latitude = 50.62)
chilling_units(data$hourtemps$Temp, summ = TRUE)

#Example 2

tempResponse(data, Start_JDay = 345, End_JDay = 58,
models = list(Chill_Harrington = chilling_units))

EduardoFernandezC/dormancyR documentation built on Aug. 24, 2022, 7:21 a.m.