oak ® egeneration · trends of mediterranean wood-pastures quercus suber and quercus rotundifolia...
TRANSCRIPT
Recent Trends of Mediterranean Wood-Pastures
Oak ®eGeneration
Major ecological implications at Southern Portugal
Augusta Costa & Tobias Plieninger| 27.09.2016 | World Congress – Silvo-Pastoral Systems 2016 |Évora |Portugal
Trends of Mediterranean Wood-PasturesQuercus suber and Quercus rotundifolia
Main goalUnderstanding the structural dynamics of Mediterranean
evergreen oaks (cork oak and holm oak)
Fragmentation dynamics1. Habitat area
2. Habitat connectivity
3. Habitat edges
Trends of Mediterranean Wood-PasturesHypothesis
Habitat
area
Fragmentation dynamics
Habitat
connectivity
Habitat
boundaries
Patch-size
distributionIsolation
Proximity
Edge
contrast
Trends of Mediterranean Wood-PasturesMethodology
2012
CORINE Land
Cover
1990 2000 2006
NUT II – Alentejo
Class-level : 244 - Agro-foretry areas
Validation
Filtering
Checking for classification quality
Checking for image interpretation (1995 and 2006 aerial photos)
ReclassificationSimplification of CORINE LandCover (merging objects)
Creating border for edge contrast
Fragmentation patterns
Output
Trends of Mediterranean Wood-Pastures
Results
Agro-forestry areas
Trends of Mediterranean Wood-PasturesAgro-forestry areas
General results
250
350
450
550
650
750
1980 1990 2000 2010 2020
Are
a (1
03h
a)
Year
Agroforestry areas in NUT II - Alentejo
Decrease of agro-forestry areas (1990 – 2006 – 2012)
Area decrease: < 1% of total area per decade
Trends of Mediterranean Wood-Pastures
Results on habitat area
Patch-size Frequency distribution
Between 1990 and 2012 - Increase of smaller areas
Agro-forestry areas
Trends of Mediterranean Wood-Pastures
Results on habitat isolation
Nearest Neighbor analysis
Between 1990 and 2012 - similar Isolation/ Proximity
Agro-forestry areas
Agro-forestry areas 1990 - 2006
Isolation/Proximity
N 1.0 (0.2)
AWNnd 1.0 (0.02)
AWProx 1.0 (0.03)
Trends of Mediterranean Wood-Pastures
Results on Habitat boundaries
Edges contrast
Agro-forestry areas
Agro-forestry areas [244] 1990 - 2006
Edges contrast
Agriculture [211- 243] 1.0 (0.02)
Shrublands [321- 324] 1.0 (0.04)
Forest [311- 313] 1.0 (0.00)
Between 1990 and 2012 – dominant edges with agriculture
Trends of Mediterranean Wood-PasturesCONCLUSIONS
The trend of variables related to the
structure, edges, connectivity and
interspersion showed that:
1. Wood - pastures are (still) stable
systems
2. Wood - pasture edges are slightly
increasing in length and
sharpness with shrublands
Trends of Mediterranean Wood-PasturesCONCLUSIONS
The trend of variables related to the
structure, edges, connectivity and
interspersion:
1. is different in the wood - pastures
with cork oak and with holm oak
2. is noticeable in sensitive areas
(and have negative ecological
implications)
1.Costa A & Plieninger T (2015). Is fragmentation affecting regime shifts occurrence in Mediterranean oak woodlands? A case study in southern Portugal. 21st International Sustainable Development Research Society Conference Tipping Point: Vulnerability and Adaptive Capacity. 21-22 July, Melbourne, Australia
http://programme.exordo.com/isdrs2015/delegates/presentation/213/
2.Costa A*, Madeira M, Santos JL & Plieninger T (2014). Recent dynamics of Mediterranean evergreen oak wood pastures in Southwestern Iberia (Portugal and Spain). In: Tibor H & Plieninger T (eds), European wood pastures in transition: a social-ecological approach, Earthscan-Routledge, pp. 70 - 89.
https://www.routledge.com/European-Wood-pastures-in-Transition-A-Social-ecological-Approach/Hartel-Plieninger/p/book/9780415869898
3.Costa A*, Madeira M, Lima Santos J, Plieninger T & Seixas J (2014). Fragmentation patterns of evergreen oak woodlands in Southwestern Iberia: identifying key spatial indicators. Journal of Environmental Management 133:18-26. doi: 10.1016/j.jenvman.22013.11.026
http://www.sciencedirect.com/science/article/pii/S0301479713007196
4.Costa A*, Madeira M & Plieninger T (2014). Cork oak woodlands patchiness: a signature of imminent deforestation? Applied Geography, 54: 18-26. doi: 10.1016/j.apgeog.2014.07.006
http://www.sciencedirect.com/science/article/pii/S0143622814001623
References
INIAV - Instituto Nacional de Investigação Agrária e Veterinária, I.P.
CENSE - New University of Lisbon (Project UID/AMB/04085/2013)
University of Copenhagen
FCT - Augusta Costa’s Post Doc Grant (SFRH/BPD/97166/2013)
Thanks
World Congress – Silvo-Pastoral Systems 2016
Évora University 27- 30th September |Évora |Portugal