cal.data: Calibration Measurements
In TREXr: Tree Sap Flow Extractor

Description Usage Format Details References

Returns raw calibration experiment data obtained from literature, with K values combined with gravimetrically determined sap flux density, as detailed in Flo et al. (2019). The data.frame contains 22 studies with 37 different species. The data is used within the tdm_cal.sfd function to calculate sap flux density. Description on the genus, species, calibration material, wood porosity and diameter of the stem is provided in Flo et al. (2019). The presented data is open for public use.

cal.data

Provides a data.frame with 4024 rows and 10 columns.

Study: Study from which the data originates (see Flo et al. 2019) (character)
Method: Heat-based sap flow measurement method (TD = Thermal Dissipation) (character)
Genus: Monitored genus (character)
Species: Monitored species (character)
Calibration.material: Description on the calibration method that was used, including stem segment, whole plant and whole plant without roots (character)
Wood.porosity: Wood structure type of the examined species, including coniferous, diffuse-porous, ring-porous and monocots (character)
Diameter: Diameter at breast height of the calibration subject (in cm) (numeric)
k: Proportional difference between Δ T and Δ Tmax measured by the thermal dissipation probes (unitless; numeric)
SFD: Sap flux density measured gravimetrically (in cm3 cm-2 h-1; numeric)
Granier: Sap flux density calculated according to Granier et al. 1985 using k (in cm3 cm-2 h-1; using k^1.231) (numeric)

Currently included studies are given below; individual labels (quoted) can be applied in tdm_cal.sfd (argument "study"):

Braun and Schmid 1999
Cabibel et al. 1991
Cain 2009
Chan 2015
Fuchs et al. 2017
Granier 1985
Gutierrez & Santiago 2005
Herbst et al. 2007
Liu et al. 2008
Lu 2002
Lu and Chacko 1998
Oliveira et al. 2006
Paudel et al. 2013
Rubilar et al. 2016
Schmidt-walter et al. 2014
Sperling et al. 2012
Sugiura et al. 2009
Sun et al. 2012
Vellame et al. 2009
Hubbard et al. 2010
Peters et al. 2017
Steppe et al. 2010

Flo V, Martinez-Vilalta J, Steppe K, Schuldt B, Poyatos, R. 2019. A synthesis of bias and uncertainty in sap flow methods. Agricultural and Forest Meteorology 271:362-374. doi: 10.1016/j.agrformet.2019.03.012

Granier A. 1985. Une nouvelle methode pour la measure du flux de seve brute dans le tronc des arbres. Annales des Sciences Forestieres 42:193–200. doi: 10.1051/forest:19850204

TREXr documentation built on March 24, 2021, 5:06 p.m.