restoration of dune grasslands in belgium
TRANSCRIPT
Sam Provoost
Restoration of dune grassland in Belgium
What is dune grasslandor ‘grey dune’ ?
Salix repens2170Quercus
robur… 2180
Pioneer vegetation(Festuca juncifolia,
Carex arenaria)
Marramdune 2120
Embryo dune 2110
Calcareousgrassland
Calcareousmoss dune
Decalcifiedgrassland
Decalcifiedmoss dune
Upper saltmarsh
(Saginion) 1330
Poo-Lolietum
Poo-Lolietum
Calcareousbasic
grassland
Rough grasslandRosa pimpinellifolia
Decalcified basic grassland
(Trifolium spec.)
Scrub 2160 (Hippophae, Ligustrum, Crataegus)
Scrub 2160(Ulex)
Blow out
Pioneervegetation
(Corynephorus)
Decalcified slack2190
Calcareous slack2190
Decalcifiedmoist
grassland
Calcareousmoist
grassland
Quercus robur2180
Rough grassland(Carex arenaria)
2130 Grey dune
Callunaheath(2140)
Salt marsh1330
Salix repens2170Quercus
robur2180
Pioneer vegetation(Festuca juncifolia,
Carex arenaria)
Marramdune 2120
Embryo dune 2110
Calcareousgrassland
Calcareousmoss dune
Decalcifiedgrassland
Decalcifiedmoss dune
Upper saltmarsh
(Saginion) 1330
Poo-Lolietum
Poo-Lolietum
Calcareousbasic
grassland
Rough grasslandRosa pimpinellifolia
Decalcified basic grassland
(Trifolium spec.)
Scrub 2160 (Hippophae, Ligustrum,
Crataegus)
Scrub 2160(Ulex)
Blow out
Pioneervegetation
(Corynephorus)
Decalcified slack2190
Calcareous slack2190
Decalcifiedmoist
grassland
Calcareousmoist
grassland
Quercus robur2180
Rough grassland(Carex arenaria)
Callunaheath(2140)
Salt marsh1330
Fixation
Succession
Succession
Moisture gradient
Disturbance gradientNutrientgradient
Nutrientgradient
Salinitygradient
Decalcification
Sand accumulation
Conservation status
Priority type Habitat Directive (2130*)
Belgium: ‘officially’ 670 ha
‘Very unfavourable’ condition
Asparagus prostratus
Viola curtisii
Erodium lebelii
International value
Phytophagous insects
Epirrhoe galiata
Phibalapteryxvirgata
Lampropteryxsuffumatavirgata
Deilephila porcellus
Threats
Habitat loss (nearly 50% urbanisation)
Succession: grass & scrub encroachment
Recreational pressure
Intensification of agriculture (P-problem)
Atmospheric deposition (N-problem)
Dune fixation (senescence)
Invasive alien species (Rosa rugosa, mahonia aquifolia, Iberis umbellata…)
Climate change ??
HerbaceousSand Scrub Woodland
198919681948
201020041999
1
2
Biodiversity decline
Anthyllis vulnerariaLeucanthemum vulgareSuccissa pratensisBriza mediaAsperula cynanchicaViola curtisiiNardus strictaFilago minima
Argynnis niobe, aglajaMonacha carthusianaHelicella italaOenanthe oenanthe (Wheatear)Lanius collurio (Red-backed shrike)
Restoration
Natura 2000 Conservation goals: + 100-150 ha
LIFE projects (ICCI – FEYDRA – ZENO)
Management plans (Flemish policy)
Scrub ↓
Tall grass ↓
Nutrients ↓
Removal of scrub & woodland
Mainly dune slack restoration
130 ha along Belgian coast
Livestock grazing
‘Basic’ dune management
First re-introduction 1996
1400 ha along Belgian coast
Mowing
Often as additional measure
Max. 190 ha (nature reserves)
Golf courses
Sod cutting
Rather small scale (max. some ha)
Mostly for slack restoration
After scrub/woodland removal
Removal of P- enriched topsoil
Results
Monitoring: ‘Permanent Inventory of Coastal Dune Reserves’
Vegetation maps
Permanent plots
Flora inventory
Fauna …
1989 2004
Artificial scrub clearing
Spontaneous scrub decay
Further scrub expansion
Impact of grazing ??
12 36 %
3 17 %
No management (t0)
No management (t1)
Grazing (t0)
Grazing (t1)
Scrub cover (%)
Permanent plots
(Grazing) pressure
Scru
bco
ver
Flora
Mapping of rare (indicator/target) species
Entire population
e.g. Thesium humifusum
- Trifolium scabrum- Medicago minima- Vulpia ciliata- V. membranacea- V. fasciculata- Lagurus ovatus
Fauna
Birds: Anthus trivialis (Tree pipet); Emberiza citrinella (Yellowhammer)
Invertebrates: ● Issoria lathonia ● Oedipoda caerulescens
Bembix rostrata
Bonte & Maes 2008. Basic and Applied Ecology
Restoration in former agricultural land
N content ↓ within decade
Hardly any change in P
Deep ploughing? P mining … ??
Conclusions & prospects
Good results with scrub removal & grazing at large sites
Relic populations (no seed bank)
Scrub dynamics: work with nature
‘Precision’ management measures
Monitoring
Nutrients (P!)
Challenge of dune fixation
Climate change ?
Thank you