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Modelling Hypothetical Eucalyptus Agroforestry systems in Portugal

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Joao Palma

on 31 May 2016

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Transcript of Modelling Hypothetical Eucalyptus Agroforestry systems in Portugal

HYPOTHETICAL
EUCALYPTUS SILVOPASTORAL
SYSTEMS IN PORTUGAL

Palma J.H.N., Oliveira TS, Crous-Duran J, Paulo JA
Eucalyptus is the forest specie with more area in PT
Wood demand (pulp) will increase at 1.6% / year
source: AIFF, 2014:
http://content.bancobpi.pt/cs/idcplg?IdcService=GET_FILE&dDocName=PR_WCS01_UCM01013076&RevisionSelectionMethod=LatestReleased
Pics source: http://www.portalacteo.com.br, http://www.boiapasto.com.br
1,2,3 testing
(modelling)
AGFORWARD stakeholders workshop suggestion
YieldSAFE
alfalfa farmer
yield data /experties
Eucalyptus irrigated
experiments
Land
Equivalent
Ratio
Carrying capacity
Calibration of eucalyptus
Calibration of ryegrass
reference natural grass (Moreno et al, 2016)
reference ryegrass yields: farmer
Data source:
Potential yield: experimental irrigated
Water limited: Permanent Sampling Plots, low site index
Calibration
Simulation
2.7 LU
1 LU
2.4 LU
1.7 LU
0.4 LU
LER : 1.2 (203 trees/ha), 1.1 (52 trees/ha)
low density (52 trees/ha) with twice the size of the trees in than forestry (1000 trees/ha)
similar differences also found by other authors
LER : 1.1 (203 trees/ha), 1.0 (52 trees/ha)
0.15 and 0.74 LU for mediterranean natural grasslands
0.8 LU
0.5 LU
0.1 LU
Higher LER in rainfed systems
AF stand volume irrigated similar to rainfed Forest
Carrying capacity similar to natural grasslands
Eucalyptus Agroforestry is not a current practice in Portugal.
Eucalyptus calibrated in YieldSAFE for the first time
Modelling allows us to explore hypothetical situations
Results suggest that with less trees (less establishment costs), similar levels of stand biomass compared to forest moncultures could be achieved
relations of this magnitude have been previously found in other temperate agroforestry systems (Balandier and Dupraz 1999; Cabanettes et al. 1999) and in other Eucalyptus species density trials, even at earlier ages (Cockerham 2004; Stape and Binkley 2010).
Eucalyptus agroforestry could help to reduce allocation of land to eucalyptus monocultures.
Field validation is needed
Final considerations
Aknowledgements:
Forest Research Center, School of Agriculture, University of Lisbon, Portugal
year 1
year 2
year 3
year 4
Pics source: Souza et al (2000)
Thank you
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