Agriculture is challenged by large scale issues, like impacts of land system changes on the preservation of environmental resources, urging agronomy to evolve. Landscape agronomy has been proposed as new perspective to address these issues (Benoît, Rizzo et al. 2012). It stressed the need for developing spatially-explicit modeling and assessment of agricultural activities at spatial levels encompassing the farm and its contexts. In line with this, we aimed at comparing two empirical studies whose common purpose was to characterize the landscape organization of agricultural land uses within a hydrological spatial framework. In particular, primary catchments were aggregated or segmented according to land use dynamics, stressing out the role of crops and meadows dynamics at different stream order levels (see Strahler, 1957). Both studies had thus to face difficulties at retrieving datasets to describe agriculture at wide spatial levels over long periods.

1. Landscape agronomy
at the watershed scale
IALE 2013 European Congress
Changing European Landscapes
Manchester 9 September 2013
Symposia I
Land system
change impacts on European landscapes
RIZZO • LAZRAK• BENOIT
INRA SAD-ASTER • Mirecourt (FR)
1
bibliographyathttp://bit.ly/IALE2013

2. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
A landscape agronomy perspective
• landscapeagronomyconceptualmodel
adaptedfromBenoit, Rizzoet al. 2012
[LP] temporal and spatialconfigurations
[FP] of agricultural land uses
[NR] withintheircontextinrelation to water quality
* on land system architecture cf. Turner II et al., 2013
hierarchicalapproachto support watershedmanagers atdealing
withLUCC
to addressland system architecture* atthe watershedlevel
AIM
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3. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
Hierarchical approach
stream order cf. Strahler1957
aggregationof the PWs
PrimaryWatershed
segmentationof the PW
new spatial unitscombining
PW & agricultural dynamics
new spatial unitscombining
agricultural dynamicswithinthe PW
biggerStrahlerorder
Strahlersub-order
definedby spatial configuration of
agricultural LU & naturalresources
landscapepatterns
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4. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
Material& Methods
•Land use stratifiedsamplingTerUtipoints for 90 land use classes for the period1981-2010
•land use return times5 yearstemporal slidingwindowon 11 land use groups
•Prim. Waters. clusteringHierarchicalclus. on Principal Comp. (FactoMiner, Houssonet al., 2012)
•mapsof homogeneousLU sequencedynamics
•seriesof satellite imagesmapsof 6 land coverclasses for the period1997-2008
•adjacent pixel withsimilarLC sequences
•temporo-spatial segmentationHiddenMarkov Model withinthe PW (Arpentage, Mari et al., 2013)
•synchronicimage of land coverchanges
aggregation• predefinedspatial units
segmentation • custom groups of pixels
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5. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
Aggregation(Meuse and Moselle)
stable
unstable
(barley, mixed,
semi-natural)
barley‘80
rapeseed- wheat
mixed farming
crops‘80
semi- natural
stable
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16 PWs(~24k Km2)
11 land use groups, 1981-2010
6 clusters with
2 major dynamics
intensification
extensification

6. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
Segmentation (Yarprimarywatershed)
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1 PW (~60Km2)
6 land coverclasses
years1997-2008
5 groups of pixels
with1 gatheringcropdynamics
Corgne, 2004
Lazrak 2012, PhDThesis
Mari et al., 2013 Arpentage

7. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
Conclusions
Focussing on temporo-spatial dynamics of (agricultural) land use for natural resource spatial units (watershed)
can enhance the understanding of the
land system architecture
aggregation• predefinedspatial units
segmentation• custom groups of pixels
Reinterpreting watershed hierarchy on homogenous land management units
can help match action spaces of relevant managers and coordinating
landscape level decision-making
Rizzo et al., 2013 Farming systems designing landscapes
Danish Journal of Geography (under review)
(take-home message)
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8. D. RIZZOet al. | Landscape agronomy at the watershed scale
IALE 2013 • Symposium 1 “Land system change impacts on European landscapes”Manchester 09/09/2013
biblioat bit.ly/IALE2013
Thankyoufor the attention !
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• bibliographyatbit.ly/IALE2013
Davide RIZZO
INRA SAD-ASTER Mirecourt (FR)
• e-mail ridavide@gmail.com
• twitter@pievarino
• websitebit.ly/RizzoD
anyquestion?