pheno_updateLeaves: Leaf phenology

In medfate: Mediterranean Forest Simulation

Leaf phenology

Description

Function pheno_leafDevelopmentStatus returns the expanded status (0 to 1) of leaves according to the growth degree days required to start bud burst and leaf unfolding, as dictated by a simple ecodormancy (one-phase) model (Chuine et al. 2013). Function pheno_leafSenescenceStatus returns the 0/1 senescence status of leaves according to the one-phase senescence model of Delpierre et al. (2009) on the basis of photoperiod and temperature. Function pheno_updateLeaves updates the status of expanded leaves and dead leaves of object x given the photoperiod, temperature and wind of a given day. It applies the development model for 1 < doy < 180 and the senescence model for 181 > doy > 365.

Usage

pheno_leafDevelopmentStatus(Sgdd, gdd, unfoldingDD = 300)

pheno_leafSenescenceStatus(Ssen, sen)

pheno_updatePhenology(x, doy, photoperiod, tmean)

pheno_updateLeaves(x, wind, fromGrowthModel)

Arguments

Sgdd	Degree days required for leaf budburst (in Celsius).
gdd	Cumulative degree days (in Celsius)
unfoldingDD	Degree-days for complete leaf unfolding after budburst has occurred.
Ssen	Threshold to start leaf senescence.
sen	Cumulative senescence variable.
x	An object of class spwbInput.
doy	Day of the year.
photoperiod	Day length (in hours).
tmean	Average day temperature (in Celsius).
wind	Average day wind speed (in m/s).
fromGrowthModel	Boolean flag to indicate that routine is called from growth simulation function.

Value

Function pheno_leafDevelopmentStatus returns a vector of values between 0 and 1, whereas function pheno_leafSenescenceStatus returns a vector of 0 (senescent) and 1 (expanded) values. The other two functions do not return any value (see note).

Note

Functions pheno_updatePhenology and pheno_updateLeaves modify the input object x. The first modifies phenological state and the second modifies the leaf area accordingly.

Author(s)

Miquel De Cáceres Ainsa, CREAF

References

Chuine, I., De Cortazar-Atauri, I.G., Kramer, K., Hänninen, H., 2013. Plant development models. Phenology: An Integrative Environmental Science. Springer, pp. 275–293.

Delpierre N, Dufrêne E, Soudani K et al (2009) Modelling interannual and spatial variability of leaf senescence for three deciduous tree species in France. Agric For Meteorol 149:938–948. doi:10.1016/j.agrformet.2008.11.014

See Also

spwb, spwbInput

medfate documentation built on Aug. 29, 2023, 5:07 p.m.