Phenology

Overview

Phenology describes the seasonal emergence and senescence of leaves. Models typically distinguish between three phenology types: evergreen, in which plants maintain constant leaf foliage throughout the year, summergreen (seasonal deciduous), in which leaves are present during the warm season and drop in the cold season, and raingreen (stress deciduous), in which leaves are present during the rainy season and drop in the dry season.

abstract type AbstractPhenology{NF} <: Terrarium.AbstractProcess{NF}

subtypes(Terrarium.AbstractPhenology)

1-element Vector{Any}:
 PALADYNPhenology

PALADYN phenology model

struct PALADYNPhenology{NF} <: Terrarium.AbstractPhenology{NF}

variables(PALADYNPhenology(Float32))

Variables
├─ Prognostic: 
├─ Auxiliary: 
├── phenology_factor [-] on XY{Center, Center}
├── leaf_area_index [-] on XY{Center, Center}
├─ Inputs: 
├── balanced_leaf_area_index [-] on XY{Center, Center}
├─ Namespaces:

This implementation follows the phenology scheme of PALADYN [4], in which raingreen phenology is not represented. The phenology factor $\phi$ represents the current fraction of the maximum leaf coverage (0 to 1), and $f_{\text{deciduous}}$ is a climate-dependent smooth transition parameter (0 to 1) between evergreen and deciduous behavior.

Leaf area index computation

The leaf area index (LAI) is computed from the balanced LAI $\text{LAI}_b$ as follows

\[\begin{equation} \text{LAI} = (f_{\text{deciduous}} \cdot \phi + (1 - f_{\text{deciduous}})) \cdot \text{LAI}_b \end{equation}\]

Process interface

compute_auxiliary!(state, grid, phenol::PALADYNPhenology)

Methods

compute_f_deciduous(phenol)

compute_phenology_factor(phenol)

compute_LAI(phenol, LAI_b)

Kernel functions

compute_phenology(i, j, grid, fields, phenol::AbstractPhenology)

compute_phenology!(
    out,
    i,
    j,
    grid,
    fields,
    phenol::PALADYNPhenology
) -> Any

References