unified_model: Unified Model

In ChillModels: Processing Chill and Heat Models for Temperate Fruit Trees

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)

ChillModels documentation built on March 26, 2020, 6:28 p.m.