biological valuation map short presentation of the biological valuation map evaluation criteria a...
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Biological Valuation Map• Short presentation of the Biological
Valuation Map
• Evaluation criteria
• A few lessons from the BVM
• BVM and international instruments
Desiré Paelinckx – Hans Bosch – Peter Adriaens
• A uniform survey of land cover and a biological evaluation of the Flemish Region
• An ecological description of the Flemish Region
A fixed set of legend units for:
• land cover (woods, arable land, pasture, urban areas….)
• vegetation(wet grassland, wet heath.…)
• landscape elements(tree rows, ponds, sunken roads.…)
What is the BVM ?
BVM version 2
field survey
Data from literary study:- municipal nature development schemes- land consolidation studies- scientific journals- ...
Digital data:- topographical map NGI- aerial photos OC-Gis Vl.- soil map NGI- bvm version 1- thematic studies- species databases-...
External data:- nature societies - nature reserve managers- foresters- volunteers-...
BVM versions
• 1978 - 1996: BVM, version 1
Global landscape ecological situation
• 1997 - 2006: BVM, version 2
More accurate and detailed instrument that can be used at parcel level
Biological Valuation Map• Short presentation of the Biological
Valuation Map
• Evaluation criteria
• A few lessons from the BVM
• BVM and international instruments
best professional judgements, with the following criteria:
• Rareness of the habitat• General biological quality
– flora (and fauna) diversity– Potential occurrence of rare flora (and fauna) – Importance of the habitat as a refuge for species
• Global vulnerability to overfertilization, acidification,....
• Replaceability: time required to create the habitat and to evolve to a certain “ecological balance”
Evaluation criteria
Evaluation:each habitat has its own fixed valuation• Mixed valuations for complexes. E.g. hp*
(w) + kn (z) becomes: (wz)
• With well-reasoned arguments it is allowed to deviate from these fixed valuations
• biologically – very valuable (z)– valuable (w)– less valuable (m)
• mixed valuations : – mw– wz – mz– mwz
• red shading : important fauna elements
Fauna:Fauna (red shading), systematic method, good frame of reference
• Red List species of mammals, breeding birds, amphibia and reptiles, fishes, dragonflies and butterflies
• Wintering waterfowl: 5% standardSpined loach
BadgerWater railgadwalls, wigeons etc
Biological Valuation Map• Short presentation of the Biological
Valuation Map
• Evaluation criteria
• A few lessons from the BVM
• BVM and international instruments
The purpose requires a verystrict method
What is the target exactly?
What is the best method for gathering information?
How to process, interpret, and present data?
What basic informationmust be gathered?
Outlining the different steps accurately
Problems with the BVM originate from
• uncertainties in legend units
• uniform mapping remains a critical issue several joint excursions per year
• evaluation
• period of time
Shortcomings of the BVM
• lack of description of the horizontal relations between units and areas
• lack of a clear connection between the abiotic environment and the mapping units
Time frame: crucial for grasslands and forests with springtime flora
if the mapping units become more detailed but the survey cannot be performed in an optimal fashion (e.g. at the right moment), the accuracy that seems to be created is misleading
detail mapping / scale mapping / period and time available
balance
Biological Valuation Map• Short presentation of the Biological
Valuation Map
• Evaluation criteria
• A few lessons from the BVM
• BVM and international instruments
BVM & Natura2000
• Ideal for defining and making a first assessment of habitat types
• Difficulties:– Restrictions typical of the BVM– Restrictions typical of the conversion of the
BVM into habitats
• Restrictions typical of the conversion of the BVM into habitats– A number of BVM mapping units are used both for
habitat and non-habitat possible habitat – A number of BVM mapping units are used for different
habitats habitat 1, habitat 2, …– Some habitats cannot be inferred from the BVM
not in the derived database– Others are difficult to infer as they are only a minor
part of the mapping unit they belong to habitat to be checked
Manual checking of the automatic conversion of existing BVM
geen habitat
31XXC
31XXC
4010;7150;6230;7140
4010C,31XXC
geen habitat
31XXC,4010C
geen habitat
4010C
4010;7150;6230;7140
31XXC
91D0
2310
m4010C,m31XXC
Vallei kleine nete.shpte controleren habitatgeen habitathabitatmogelijk habitatxzbdeels habitatNo Data
geen habitat
4010;7150;6230;7140
m3110;m3130;m3140;m7140;m7150
geen habitat
geen habitat
2310;4030;5130
Habbwk_nrp_ant.shphmhzbcghonbekend
Habitat key for Flanders
• What: further development of habitat sheets for field surveys, with clearer demarcation of habitat, less-developed habitat (new in 2004), and absence of habitat
• Target: identifying the correct N2000 habitat type and estimating its percentage in the field during BVM mapping