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traitecoevo / austraits.build

Source for AusTraits
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Leaf Mass per Area #663

Closed klapierre closed 1 year ago

klapierre commented 1 year ago

In the most recent version (4.1.0), SLA is no longer included but leaf mass per area is. These should be inverses, but when I inverse the leaf mass per area values they are all really small numbers (mean: .0105386, max: 0.3763720). Other trait databases (TRY and BIEN) have values for the same subset of species that are much larger (e.g., BIEN mean: 26.77, max: 349.74). Is there an issue with the leaf mass per area data?

What a great database you've assembled, thanks!

library(austraits)
library(tidyverse)

austraits <- load_austraits(version = "4.1.0", path = "data/austraits")

traits <- summarise_austraits(austraits, "trait_name")

data <- extract_trait(austraits, c('leaf_mass_per_area'))

traitData <- data$traits%>%
  mutate(value=1/value,
         trait_name='leaf_mass_per_area')

summary(traitData$value)
ehwenk commented 1 year ago

Thanks for the message. You're right that we've decided to invert from SLA to LMA, since this matches our other "mass per area" traits. I think what you're noticing is that the units aren't simply inverted. The standard units for LMA are g/m2 while the units for SLA are most commonly mm2/mg (at least that is what we used). This means when you invert from SLA in mm2/mg to LMA in g/m2 you also have to multiply the values by 1000. - Lizzy