wue: Water Use Efficiency

In dpabon/ecofunr: Deriving Ecosystem Functional Properties

Description

This function estimate different metrics of Water Use Efficiency.

Usage

wue(
  GPP,
  VPD,
  ET,
  Gs,
  method = "wue",
  dates,
  aggregation.time = NULL,
  aggregation.metric = "median",
  overlapping = NULL,
  probs = 0.9
)

Arguments

GPP	time series. Object of class "vector" (umol CO2 m-2 s-1).
VPD	time series. Object of class "vector" (kPa).
ET	time series. Object of class "vector". See: LE.to.ET (kg m-2 s-1).
Gs	bulk surface conductance. Object of class "vector"
method	WUE index. By default "wue". Options: "wue", "iwue", "Iwue", "uwue", "all". See Details for further explanaition.
dates	a vector of class "Date" with the same length of GPP.
aggregation.time	Can be "NULL", "day", "month", "year", growing season "gs". if it's a number it's considered as a time window in number of days. If "optim" the optimum number of days will be estimate to reduce the sd of each chunck. See aggreg.
aggregation.metric	Can be "mean", "max", "min", "median", and "quantile". if "quantile" a number between 0 and 1 need to be provided for prob parameter.
overlapping	Can be "NULL" or a number. If it's a number equivale to the parameter by of the rollapply function.
prob	Only used if aggregation.metric is "quant", a number between 0 and 1. By default 0.9.

Details

Water Use Efficiency (wue) \insertCitelaw_environmental_2002ecofunr

WUE = GPP / ET

Intrinsic Water use efficiency (iwue) See: \insertCitebeer_temporal_2009-1ecofunr

iWUE = GPP / Gs

where Gs is the bulk surface conductance. See surface.conductance

Inherent Water Use Efficiency (Iwue) \insertCitebeer_temporal_2009-1ecofunr

IWUE = GPP * VPD / ET

Underlyng Water Use Efficiency (uwue) \insertCitezhou_effect_2014ecofunr

uWUE = GPP * sqrt(VPD) / ET

Undelying Water Use Efficiency using transpiration from TEA algorithm (teauWUE) \insertCitenelson_coupling_2018-1ecofunr

teauWUE = GPP * sqrt(VPD) / T

where T is Transpiration derived from TEA algorithm \insertCitenelson_coupling_2018-1ecofunr

Value

An object of type "data.frame" if method = "all". Otherwise an object of the class "vector".

References

\insertAllCited

dpabon/ecofunr documentation built on July 15, 2020, 12:58 p.m.