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Process based models - YieldSAFE

Lecture for introduction of YieldSAFE, a parameter sparse process based agroforestry model
by

Joao Palma

on 21 May 2016

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Transcript of Process based models - YieldSAFE

FOREST
AGRICULTURE
AGROFORESTRY
Process Based models
Yield-SAFE
Yield-SAFE
Yield Estimator for Long-term
Design of Silvoarable Agro-Forestry for Europe
Article
YieldSAFE Concept - Radiation distribution
YieldSAFE Concept - Water distribution
INPUTS
State
Variables
Hybridization
Model Structure
Driven Forces: Daily Climate
Radiation (MJ/m2)
Temperature (ºC)
Rain (mm)
Biophysical initialization
Initial Biomass
Initial Leaf Area
Initial soil water content
...
João HN Palma
www.isa.utl.pt/~joaopalma
Management
TREE:
Planting density
Prunning DOY
Thinning DOY
Proportion biomass prunned
Irrigation periodicity (facultative)
...
CROP:
Crop rotation
Planting DOY
Harvesting DOY
...
Parameters
TREE PARAMETERS
CROP PARAMETERS
SOIL PARAMETERS
TREE Biomass
TREE Leaf Area
TREE Transpiration
CROP Biomass
CROP Leaf Area
CROP Transpiration
SOIL water content
SOIL Evaporation
...
(outputs)
(other state variables outputs)
Basal Area
Tree/Stand Height
Tree/Stand Diameter
Tree/Stand Volume
...
Model Validation
Model Equations
Potential TREE Growth
Water limited TREE Growth
Water Use by TREE
Leaf Area by tree
Number of Shoots per TREE
TREE Prunning and Thinning
Potential CROP Growth
Water limited CROP Growth
Water used by CROP
Leaf Area of CROP
Heat SUM
Partitioning of dry matter to leaves in the CROP
SOIL Water content
SOIL pF
SOIL Drainage
SOIL Evaporation
Please download article for equation details
Model flow and family
YS Flow
YS Family
van der Werf et al. 2007
Ecological Engineering 29, 419-433
Validation - Poplar
Validation - Walnut, Cherry, Oak, Pine
Validation - Soil
Irrigated Maize, Turkey
Mayus et al, 2007, Lecture Notes in Informatics
http://subs.emis.de/LNI/Proceedings/Proceedings101/gi-proc-101-033.pdf
Model uses van Genuchten equations for soil tension (pF)
Parameters at EU level for the equation, published by Wösten et al (1999), can be used in model
Model just needs texture (FAO classes - 1 to 5) and soil depth
comparison with parameter intense models
STICS -
Crop model, France
Modeled Wheat, Wageningen (NL)
CABALA -
Forest model, Australia, Modeled Eucalyptus, (several AU)
Model Exploration
Water dynamics in AF systems
Example during 365 days in a mature system with 113 trees/ha
cumulated values 365 days
Higher ET
Lower soil evaporation
Higher efficiency!
radiation dynamics in AF systems
Example during 365 days in a mature system with 113 trees/ha
cumulated values 365 days
Higher efficiency
Some examples of modern
silvoarable agroforestry systems
poplar-wheat
walnut - triticale
walnut-wheat
walnut-wheat
walnut-ricinus
poplar-wheat
Full transcript