% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/biomass.R
\docType{data}
\name{Biomass}
\alias{Biomass}
\title{Biomass Allocation in Two Grass Species Under Different Nitrate Supply}
\format{
A data frame with 500 observations and 13 variables:
\describe{
  \item{group}{Factor. Combined species-by-nitrate-treatment code
        (\code{DfH}, \code{DfL}, \code{HlH}, \code{HlL}), corresponding to the combination of
        \code{species} and \code{trt} where:
    \itemize{
      \item \code{DfH} = D. flexuosa (slow-growing), high nitrate
      \item \code{DfL} = D. flexuosa (slow-growing), low nitrate
      \item \code{HlH} = H. lanatus (fast-growing), high nitrate
      \item \code{HlL} = H. lanatus (fast-growing), low nitrate
    }
  }
  \item{species}{Factor. Species scientific name (\code{D. flexuosa} or
        \code{H. lanatus}).}
  \item{trt}{Factor. Nitrate treatment level (\code{high} or \code{low}).}
  \item{day}{Numeric. Experimental day (0 to 49).}
  \item{pl_num}{Numeric. Plant number (individual plant identifier,
        6-8 replicates per treatment).}
  \item{ldm_mg}{Numeric. Leaf dry mass (in mg).}
  \item{sdm_mg}{Numeric. Stem dry mass (in mg).}
  \item{rdm_mg}{Numeric. Root dry mass (in mg).}
  \item{tdm_mg}{Numeric. Total dry mass (in mg).}
  \item{lmf}{Numeric. Leaf mass fraction, proportion of biomass allocated
        to leaves, bounded in the open interval (0, 1).}
  \item{smf}{Numeric. Stem mass fraction, proportion of biomass allocated
        to stems, bounded in the open interval (0, 1).}
  \item{rmf}{Numeric. Root mass fraction, proportion of biomass allocated
        to roots, bounded in the open interval (0, 1).}
  \item{ln_tdm}{Numeric. Natural log of total dry mass (log-transformed
        for allometric analysis).}
}
}
\source{
bobdouma (2019). \emph{bobdouma/proportions_beta_Dirichlet: v.01}.
\doi{10.5281/zenodo.3234670}.
}
\usage{
data(Biomass)
}
\description{
This dataset examines biomass allocation patterns in plants, specifically
the proportional distribution of biomass to different plant organs (stems,
leaves, and roots). The data come from an experiment manipulating nitrate
supply in fast-growing and slow-growing grass species.

The response variables (stem, leaves, roots) are proportions bounded in the
(0, 1) interval, making them suitable for simplex regression analysis.
}
\examples{
# Load the data
data(Biomass)

# Quick overview
head(Biomass)
str(Biomass)

# Check that proportions sum to 1 (within rounding error)
summary(rowSums(Biomass[, c("lmf", "smf", "rmf")]))

# Simple plot of root mass fraction by treatment
boxplot(rmf ~ trt * species, data = Biomass,
        main = "Root Mass Fraction by Species and Nitrate Treatment",
        las = 2)
}
\references{
bobdouma (2019). \emph{bobdouma/proportions_beta_Dirichlet: v.01}.
\doi{10.5281/zenodo.3234670}.

Poorter, H.; van de Vijver, C. A. D. M.; Boot, R. G. A. and Lambers, H. (1995).
Growth and carbon economy of a fast-growing and a slow-growing grass
species as dependent on nitrate supply. \emph{Plant and Soil}, \bold{171},
217--227. \doi{10.1007/BF00010275}

Poorter, H. and Sack, L. (2012). Pitfalls and possibilities in the analysis
of biomass allocation patterns in plants. \emph{Frontiers in Plant
Science}, \bold{3}, 259. \doi{10.3389/fpls.2012.00259}
}
\keyword{datasets}
