| unified_model {ChillModels} | R Documentation |
Unified Model
Description
Quantifies the chill accumulation by means of converting temperatures to chill-units.
Usage
unified_model(x, a = 0.89, b = -28.87, c = -19.44, total = TRUE)
Arguments
x |
Vector containing temperature values (Celsius-degree). |
a |
Parameter defined by the user as the function limits. Default is 0.89. |
b |
Parameter defined by the user as the function limits. Default is -28.87. |
c |
Parameter defined by the user as the function limits. Default is -19.44. |
total |
TRUE Shows the total value of accumulation, FALSE shows the value of chill-unit for each temperature (TRUE is default). |
Details
The coefficients used in this model are adjusted for the apple tree.The model is based on chill-units, but the limits are unknown.
Value
The function returns values the chill-units for each temperature of vector (Total = FALSE), or returns the chill-units accumulation (Total = TRUE).
References
Chuine, I. et al. 2016. Can phenological models predict tree phenology accurately in the future? The unrevealed hurdle of endodormancy break. Global Change Biology.
Chuine, Isabelle. 2000. A unified model for budburst of trees. Journal of Theoretical Biology
Examples
x <- rnorm(500,10,3)
unified_model(x)
unified_model(x, total = FALSE)