Livestock herbivory as tool for ecosystem management and … · 2020-02-12 · Symposium “Towards...
Transcript of Livestock herbivory as tool for ecosystem management and … · 2020-02-12 · Symposium “Towards...
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Symposium “Towards Precision Agro-Ecology for Sustainable Grazing”
Livestock herbivory as tool for ecosystem management
and restoration
Vânia Proença1, Inês Ribeiro1, Tiago Domingos1, Ivo Gama2, Daniel Oliveira1,
Nuno Rodrigues2, Leonor Themudo Barata1,3
1 MARETEC, LARSyS, Instituto Superior Técnico, Univ. Lisboa; 2 Terraprima; 3 LEAF, Instituto Superior de Agronomia, Univ. Lisboa
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Large herbivores and ecosystem dynamics
Species richness for extant large herbivores of Europe
Navarro et al. 2015, Rewilding Euopean Landscapes
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Testing the use of livestock to manage vegetation
Operational Group SILVPAST
Goal: test and develop the implementation of silvo-pastoral mosaics, supported by remote sensing tools, to assist agricultural and forestry activities in areas of black oak (Quercus pyrenaica).
Team: Farmers (land owners),NGOs, Researchers
Silvo-pastoral mosaics :
i) Pastures in open areas, with livestock
ii) Forest parcels open to livestock
iii)Forest parcels closed to grazing
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Study Area – Quinta da França
Test areaCattle GPS locationsJuly 2018
Control
Test
Fence
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Use of space and habitat selection by cattle
Drone
Land cover0.6m
Land cover10m
NDVI summer10m
Bare Herb Shrub Tree10-30%
Tree>30%
0-0.2 0.2-0.4 0.4-0.6 0.6-0.8
Count of cattle presences
Land cover 10m
NDVI
Electivity
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Use of space and habitat selection by cattle
Bare Herb Shrub Tree (10-30%) Tree (>30%)Bare Herb Shrub Tree
(10-30%)Tree (>30%)
0
0.4
0.8
0
0.4
0.8
All pixels
Cattle
ND
VI
ND
VI
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Use of space and habitat selection by cattle
- Maxent to model use of space
- Most important variables:
- Distance to water- Distance to roads- Slope- NDVI
- Least important variables:
- Land cover (%)
Response to distance to water (m)
Response to summer NDVI
0 400 800 1200 1600 2000 0
0.5
1
00.1
0.5
0.9
0.2 0.4 0.6 0.8
Pro
bab
ility
of
pre
sen
ce
[distance to water not included]
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2018 2019
0 – 0.25m
1.3 – 2m
0.5 – 1.3m
2 – 4m
> 4m
0.25 – 0.5m
0 – 0.25m
1.3 – 2m
0.5 – 1.3m
2 – 4m
> 4m
0.25 – 0.5m
Bare soil Grass Forb Shrub Tree
HeightHeight
0 0.2 0.4 0.6 0.8 1 1.2 0 0.2 0.4 0.6 0.8 1 1.2
Effects on vegetation structure (1st year)
24 (100m2) quadrats=pixels 21 intercept points p/quadrat= 504 points
-58%-43%
-32%
• Decline of oak cover in the lower layers
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2018 2019
0 – 0.25m
1.3 – 2m
0.5 – 1.3m
2 – 4m
> 4m
0.25 – 0.5m
0 – 0.25m
1.3 – 2m
0.5 – 1.3m
2 – 4m
> 4m
0.25 – 0.5m
Bare soil Grass Forb Shrub Tree
HeightHeight
0 0.2 0.4 0.6 0.8 1 1.2 0 0.2 0.4 0.6 0.8 1 1.2
Effects on vegetation structure (1st year)
24 (100m2) quadrats=pixels 21 intercept points p/quadrat= 504 points
-100%
-82%, -88%
• Decline of tall grasses in the intermediate layers
• Decline of oak cover in the lower layers
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2018 2019
0 – 0.25m
1.3 – 2m
0.5 – 1.3m
2 – 4m
> 4m
0.25 – 0.5m
0 – 0.25m
1.3 – 2m
0.5 – 1.3m
2 – 4m
> 4m
0.25 – 0.5m
Bare soil Grass Forb Shrub Tree
HeightHeight
0 0.2 0.4 0.6 0.8 1 1.2 0 0.2 0.4 0.6 0.8 1 1.2
+238%
Effects on vegetation structure (1st year)
24 (100m2) quadrats=pixels 21 intercept points p/quadrat= 504 points
• Increase of forbs in the ground layer• Changes to NDVI not conclusive yet
• Decline of oak cover in the lower layers
• Decline of tall grasses in the intermediate layers
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To conclude…
Use of space:Distance to waterPresence of roads/trailsVegetation complexity
Effects on vegetation structure: Possible impacts on oak regenerationSimplification of structure at lower layersLimited control of shrub cover
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This work was supported by FCT/MCTES (PIDDAC) through project UID/EEA/50009/2019
V.P. is supported by contract CEECIND/04469/2017 from FCT
Operational Group “GO SILVPAST” is an Operational Group financed by PDR 2020.