Calculation of cumulative chill according to the Dynamic Model

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Description

This function calculates winter chill for temperate trees according to the Dynamic Model.

Usage

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Dynamic_Model(HourTemp, summ = TRUE)

Arguments

HourTemp

Vector of hourly temperatures.

summ

Boolean parameter indicating whether calculated metrics should be provided as cumulative values over the entire record (TRUE) or as the actual accumulation for each hour (FALSE).

Details

Chill Portions are calculated as suggested by Erez et al. (1990).

Value

Vector of length length(HourTemp) containing the cumulative Chill Portions over the entire duration of HourTemp.

Author(s)

Eike Luedeling

References

Dynamic Model references:

Erez A, Fishman S, Linsley-Noakes GC, Allan P (1990) The dynamic model for rest completion in peach buds. Acta Hortic 276, 165-174

Fishman S, Erez A, Couvillon GA (1987a) The temperature dependence of dormancy breaking in plants - computer simulation of processes studied under controlled temperatures. J Theor Biol 126(3), 309-321

Fishman S, Erez A, Couvillon GA (1987b) The temperature dependence of dormancy breaking in plants - mathematical analysis of a two-step model involving a cooperative transition. J Theor Biol 124(4), 473-483

Examples

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weather<-fix_weather(KA_weather[which(KA_weather$Year>2006),])

hourtemps<-stack_hourly_temps(weather,latitude=50.4)

Dynamic_Model(hourtemps$hourtemps$Temp)

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