Systèmes sylvopastoraux. Pour un environnement, une agriculture et une économie durables
Zaragoza : CIHEAM
Cahiers Options Méditerranéennes; n. 12 1995
pages 231-234
Article available on lin e / Article dispon ible en lign e à l’adresse :
--- http://om.ciheam.org/article.php?ID PD F=96605526
--- To cite th is article / Pou r citer cet article
--- Bergez J.E., Msika B. A silvopastoral model for th e EU . Systèmes sylvopastoraux. Pour un environnement, une agriculture et une économie durables . Zaragoza : CIHEAM, 1995. p. 231-234 (Cahiers Options Méditerranéennes; n. 12)
---
http://www.ciheam.org/
http://om.ciheam.org/
A silvopastoral model for the EU
Bergez Jacques-Eric’ and Bruno2 1 :
2 : I N R A , 9,
: une de des et
le de CT92 0134)
fonde ses objectifs : de les la du paysage
; une de bois de qualité dans les a f n de
activités et de les ; le multiusage les
possibilité de changement d’affectation de
le de ce les ont bâti un modde biophysique de de
système et de l’évolution ; ce est développé en langage
C++ et basé 5 le mésoclimat, l’animal et le sol) et
dynamiques. Le modèle est alimenté des du
ou à défaut, la existante.
Ce modèle biophysique est de façon à la liaison avec un modèle bioéconomique développé
au Uni. simulations à l’échelle de la une
validation de l’outil, un d’échelle de en
compte, au niveau d’un massif, les le système d’élevage et le paysage.
: système
-
modèle biophysique-
caducifoliés.in is to
it maintain m a l
of
Well established in developing counties in
is
the
is
the length of time to of
to et al,
1985 ; ; ; to
of
to at
of to that the at
The aim of to
AZternative Agriculture C792 0134).
-
OF
to the model is based
on
an on
23 1
CIHEAM - Options Mediterraneennes
Outputs: The model is designed to be linked to (Thomas, 1991). Outputs of the model a)
weight) and b) by
of General information:
location and soil type), the species to
Tree submodel: on the
1980)
the et al, 1985 ; et al, 1986) uI(
data 1979). The of
at
of the canopy, leaf of the bole (and consequently
the is
of of
assumed that the canopy fits in width of the canopy is limited by the
submodel: is site
file the total
A 40
as
the state of at is
calculated:
1. A
leaf A
to 2. The mean
of
to 4.
5.
at
Sward submudel:
(N)
the outputs of this module.
Animal submodel:
an animal depends on the quantity and quality of of
N content, C/N As an outpufof
to
Quantity of of lambs, and quantity of meat,
of this module.
Suì2 submudel: Two components in the soil: N and
to fit the in the animal,
The soil is divided in 30cm.
of the of
is used by both components.
of the is it
to by to in
i
at
be chosen by the
CIHEAM - Options Mediterraneennes
2.
3.
4.
5 . 6 .
is a competition the establishment phase of the
The consumption of by the The
may then be used by the
is no effect of animals on the taken into account at this stage.
the mainly modifies the is no spatial effect taken into account.
the animal the the the quality of
the
on the quality and quantity of the the animal will be
animals and modi5 the the cycle in the soil and have
-
on this model should be completed
by the end of 1995. obstacles to the validation of such a
model as is a lack of data in
data fiom the be used to validate at least the establishment
phase. The link with the be made in 1995. At a
stage, the plot-scale model will be into a field management scheme at the level.
Aston, 1979. by eight small trees. Journal Hydrology, 42: 383-396.
Anderson, 1991. Computer modelling of agroforestry systems. Thesis, of
Anonymous,-1992. tree. Simulation model for economic evaluation agroforestry and trees on farms.
J. J., 1986. an economic of the benefits of
P.J., 1985. edition, National
Forestry Commission, 1980. Yield models for forest management. Alice Lodge,
Green, 1990. AirJlow through and above a forest widely spaced trees. of
N.J., A model of in sheep
1990. environment physics. 263 p -t
B., des relations herbe-arbre sous peuplements de Quercus pubescens Willd. et
1990. A of the Agroforestry
1985. planting on upland sheep Thomas, T., 1991. A to the economic modelling of
1989. A model of flows and
287p
by the of Food and of
with in lowland Agricultural Systems, 21: 1-32.
of National 96p.
3 13p.
appendices.
Höss. dans les of 11 lp.
abstracts 3:149-164.
-
study team 2 7p.ecology ciñd management, 45: 207-235.
12: 863-886.
