Landscape agronomyat 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 • BENOITINRA SAD-ASTER • Mirecourt (FR)
1bibliography at http://bit.ly/IALE2013
D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at bit.ly/IALE2013
A landscape agronomy perspective
• landscape agronomy conceptual model adapted from Benoit, Rizzo et al. 2012
[LP] temporal and spatialconfigurations
[FP] of agricultural land uses
[NR] within their context inrelation to water quality
* on land system architecture cf. Turner II et al., 2013
hierarchical approachto support watershedmanagers at dealingwith LUCC
to address land system architecture* at the watershed level
AIM
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D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at bit.ly/IALE2013
Hierarchical approach
stream order cf. Strahler 1957
aggregationof the PWs
Primary Watershed
segmentationof the PW
new spatial units combiningPW & agricultural dynamics
new spatial units combiningagricultural dynamics within the PW
bigger Strahler order
Strahler sub-order
defined by spatial configuration of agricultural LU & natural resources
landscape patterns
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D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at bit.ly/IALE2013
Material & Methods
• Land use stratified samplingTerUti points for 90 land use classes for the period 1981-2010
• land use return times5 years temporal sliding window on 11 land use groups
•Prim. Waters. clusteringHierarchical clus. on Principal Comp. (FactoMiner, Housson et al., 2012)
•maps of homogeneous LU sequence dynamics
• series of satellite imagesmaps of 6 land cover classes for the period 1997-2008
• adjacent pixel with similarLC sequences
• temporo-spatial segmentationHidden Markov Model within the PW (Arpentage, Mari et al., 2013)
• synchronic image of land cover changes
aggregation • predefined spatial units segmentation • custom groups of pixels
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D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at 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
D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at bit.ly/IALE2013
Segmentation (Yar primary watershed)
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1 PW (~60Km2)6 land cover classesyears 1997-2008
5 groups of pixelswith 1 gathering cropdynamics
Corgne, 2004Lazrak 2012, PhD ThesisMari et al., 2013 Arpentage
D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at 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 • predefined spatial 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 landscapesDanish Journal of Geography (under review)
(take-home message)
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D. RIZZO et al. | Landscape agronomy at the watershed scaleIALE 2013 • Symposium 1 “Land system change impacts on European landscapes” Manchester 09/09/2013
biblio at bit.ly/IALE2013
Thank you for the attention !
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• bibliography at bit.ly/IALE2013
Davide RIZZOINRA SAD-ASTER Mirecourt (FR)
• e-mail [email protected]• twitter @pievarino• website bit.ly/RizzoD
any question?