% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-materials-wrb.R
\name{fluvic_material}
\alias{fluvic_material}
\title{Fluvic material (WRB 2022)}
\usage{
fluvic_material(pedon, max_top_cm = 100, min_clay_swing = 8)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{max_top_cm}{Maximum top depth (cm) considered (default 100).}

\item{min_clay_swing}{Minimum absolute clay-percent change between
consecutive layers required to count as alternation
(default 8 percentage points).}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
Tests whether the profile shows fluvic material features: alternating
textures across consecutive horizons within the upper 100 cm AND an
irregular (non-monotone) organic carbon pattern with depth.
Diagnostic of Fluvisols.
}
\details{
Sub-test: \code{test_fluvic_stratification}.

v0.3 limitations: WRB 2022 fluvic material also requires age
(typically <100 years for sediment freshness), which v0.3 does not
check (no temporal fields in the schema). The stratification proxy
is conservative -- truly heterogeneous floodplain profiles with
dramatic texture swings will pass; subtle alluvial sequences may
miss. v0.4 will refine.
}
\references{
IUSS Working Group WRB (2022), Chapter 3, Fluvic material.
}
