使用ggplot的条形图和折线图的多个y轴

我有一个实验的蒸腾数据，希望将其显示为使用R的线图上的时间序列。我也有一些降水数据，希望与条形图显示在同一张图上。我已经可以使用R的基本程序来执行此操作，但是我想在ggplot中执行此操作。我到处搜索过，我知道设计师不太喜欢用这种方式制作图形，因此很难，但是我看到它是通过使用两个y轴的多个线图/散点图完成的。可以通过折线图和条形图来完成吗？

这是我在基本R中所拥有的

这是我用来作图的数据

时间序列数据在这里

此处的降雨数据

这是上面剧情的代码。

 attach(summary)
library(Hmisc)
library(scales)
par(mar=c(6.5,4,4,5)+.1)
plot(summary$dates,summary$c_mean_am,type="n",ylim=c(100,350),
     main="Stomatal Conductance during experiment",las=1,cex.main=1,
     font.lab=2,font.axis=2,cex.axis=0.7,cex.lab=0.8,
     ylab=expression('Stomatal conductance'~(m~mol~ m^{2})),,xlab="Date")
lines(dates,c_mean_am,pch=21,cex=0.6,bg="blue",col="blue")
lines(dates,T1_mean_am,pch=21,cex=0.6,bg="yellow",col="yellow")
lines(dates,T2_mean_am,pch=21,cex=0.6,bg="hotpink1",col="hotpink1")
lines(dates,T3_mean_am,pch=21,cex=0.6,bg="orange",col="orange")
lines(dates,T4_mean_am,pch=21,cex=0.6,bg="red",col="red")
with (data = summary  , expr = errbar(dates, c_mean_am, 
                                      c_mean_am+c_se_am, 
                                      c_mean_am-c_se_am, 
                                      add=T, pch=21,col="blue",bg="blue",
                                      cex=0.6,cap=0.01,errbar.col="blue"))
with (data = summary  , expr = errbar(dates, T1_mean_am, 
                                      T1_mean_am+T1_se_am, 
                                      T1_mean_am-T1_se_am, add=T, 
                                      pch=21,col="yellow",bg="yellow",
                                      cex=0.6,cap=0.01,errbar.col="yellow"))
with (data = summary  , expr = errbar(dates, T2_mean_am, 
                                      T2_mean_am+T2_se_am, 
                                      T2_mean_am-T2_se_am, 
                                      add=T, pch=21,col="hotpink1",
                                      bg="hotpink1",cex=0.6,cap=0.01,
                                      errbar.col="hotpink1"))
with (data = summary  , expr = errbar(dates, T3_mean_am, 
                                      T3_mean_am+T3_se_am, 
                                      T3_mean_am-T3_se_am, 
                                      add=T, pch=21,col="orange",
                                      bg="orange",cex=0.6,cap=0.01,
                                      errbar.col="orange"))
with (data = summary  , expr = errbar(dates, T4_mean_am, 
                                      T4_mean_am+T4_se_am, 
                                      T4_mean_am-T4_se_am, add=T, 
                                      pch=21,col="red",bg="red",
                                      cex=0.6,cap=0.01,errbar.col="red"))
data2<-Rainfall
names(data2)
par(new=TRUE)
graph<-tapply(data2$`daily rainfall`,data2$DATE,I)
barplot(graph,col="light blue",border=NA,xaxt="n",yaxt="n",xlab="",ylab="",ylim=c(0,150))
axis(4,las="1",cex.axis=0.7,font.axis=2)
mtext("Rainfall (mm)",side=4,line=3,font=2,cex=0.8)

以下是ggplot时间序列图和格式略有不同的相同数据。

这是代码

dt<-am_means
attach(dt)
dt$dates <- as.Date(dt$dates,format = "%d/%m/%y")
sp<-ggplot(dt,aes(x=dates,y=cond,colour=Treatment,group=Treatment))+geom_errorbar
(aes(ymin=cond-err,ymax=cond+err),width=0.5,size=0.5)+geom_line()+geom_point()+scale_x_date
(date_breaks = "2 weeks",date_minor_breaks = "1 week",date_labels = "%b %d")

sp2<-sp + scale_color_manual(breaks = c("Control", "T1","T2","T3","T4"),
values=c("blue", "yellow","hotpink1","orange","red"))

print(sp2 +ylim(100, 350)+labs(title= "Stomatal Conductance - Tamata Maples", 
y=expression(Conductance (m~mol~m^{-2})), x = "Date"))

可以在同一ggplot折线图上显示降雨条形图吗？