apricotFFD: First flowering date records of _Prunus armeniaca_

In spphpr: Spring Phenological Prediction

First flowering date records of Prunus armeniaca

Description

The data consist of the first flowering date records of Prunus armeniaca at the Summer Palace (39{}^{\circ}54'38'' N, 116{}^{\circ}8'28'' E, 50 m a.s.l.) in Beijing, China between 1963 and 2010 with the exception of 1969-1971, and 1997-2002. Data source: Chinese Phenological Observation Network (Guo et al., 2015).

Usage

data(apricotFFD)

Details

In the data set, there are two columns of vectors: Year and Time. Year saves the recording years; and Time saves the 1963-2010 first flowering dates of Prunus armeniaca (in day-of-year).

References

Guo, L., Xu, J., Dai, J., Cheng, J., Wu, H., Luedeling, E. (2015) Statistical identification of chilling and heat requirements for apricotflower buds in Beijing, China. Scientia Horticulturae 195, 138-144. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.scienta.2015.09.006")}

Examples

data(apricotFFD)
attach(apricotFFD)

dev.new()
par1 <- par(family="serif")
par2 <- par(mar=c(5, 5, 2, 2))
par3 <- par(mgp=c(3, 1, 0))
plot( Year, Time, asp = 1, cex.lab = 1.5, cex.axis = 1.5, 
      xlab = "Year", ylab = "First flowering date (day-of-year)" ) 
par(par1)
par(par2)
par(par3)

# graphics.off()

spphpr documentation built on April 11, 2025, 6:11 p.m.