GDH: Calculation of cumulative heat according to the Growing...

In chillR: Statistical Methods for Phenology Analysis in Temperate Fruit Trees

Calculation of cumulative heat according to the Growing Degree Hours Model

Description

This function calculates heat for temperate trees according to the Growing Degree Hours Model.

Usage

GDH(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

Growing Degree Hours are calculated as suggested by Anderson et al. (1986).

Value

Vector of length length(HourTemp) containing the cumulative Growing Degree Hours over the entire duration of HourTemp.

Author(s)

Eike Luedeling

References

Growing Degree Hours reference:

Anderson JL, Richardson EA, Kesner CD (1986) Validation of chill unit and flower bud phenology models for 'Montmorency' sour cherry. Acta Hortic 184, 71-78

Examples

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

hourtemps<-stack_hourly_temps(weather,latitude=50.4)

GDH(hourtemps$hourtemps$Temp)

chillR documentation built on Nov. 28, 2023, 1:09 a.m.