VSD+ PROPS. Luc Bonten, Janet Mol, Wieger Wamelink, Gert Jan Reinds, Jan-Cees Voogd
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1 VSD+ PROPS Luc Bonten, Janet Mol, Wieger Wamelink, Gert Jan Reinds, Jan-Cees Voogd
2 Contents VSD+, what is new PROPS What is PROPS Extension of number of species in PROPS Limit number of species in PROPS calculations VSD+ PROPS
3 What is new in VSD+ option for calcareous soils no Ca and Mg weathering no cation exchange new parameter: parentca (<0 for non-calcareous, 1 for CaCO 3, 0 for MgCO 3 ) new organic C model: RothC N mineralisation linked to C turnover new parameters: o rfmir (also in MetHyd o QIlf (0.25 for forest, 0.67 for grassland)
4 1. What is PROPS PROPS model that calculates the chance (probability) that a plant species is present based on measurable abiotic conditions Derived from: relevés with simultaneously measured abiotic conditions (N, ph) climate data
5 Relevés with abiotic measurements 4596 relevés in Netherlands, Austria and Ireland ph and N (N-total, C/N ratio and/or NO 3 ) 519 species that were found 25 relevés
6 Relevés with measurements of abiotic conditions
7 Response functions 2 dimensional response functions: ph N (N-total, CN, NO 3 ) logit(y) = α + β 1 ph + β 2 N + γ 1 ph 2 + γ 2 N 2 + δph N probability = 1/(1+exp(-logit(y))
8 Fitting of response functions
9 Example: Atriplex prostrata
10 Example: Calluna vulgaris
11 Results Number of plant species with response functions ph + N-total: 406 ph + CN ratio: 330 ph + NO 3 : 146
12 2. Extension number of species Problem: only few relevés where abiotic conditions have been measured response functions for few species how to get abiotic conditions for other relevés? Datasets: Abiotic dataset: ± 4600 relevés with measurements of abiotic conditions Bioscore dataset: ± 430,000 relevés without abiotic conditions
13 Bioscore dataset
14 methodology to include more species in PROPS 2 step approach: Step 1. estimate abiotic conditions based on presence of plant species with known response functions Step 2. derive response functions based on estimated abiotic conditions
15 estimation of abiotic conditions Abiotic dataset (± 400 species, response for ph and N) Sp1 Sp2 Spn species that in Bioscore with response functions in Abiotic dataset Bioscore dataset (430,000 relevés, ± 4,000 species) Sp1 Sp2 Spx relevé Sp1 Sp6 SP20 Sp78 Sp145 Sp221 Sp456 estimate ph and N from species with response functions (at least 5 species from abiotic dataset)
16 estimation of abiotic conditions
17 Bioscore dataset with abiotic conditions
18 Validation
19 Fitting response functions 4 dimensional response functions: ph N temperature precipitation logit(y) = α + β 1 x 1 + β 2 x 2 + β 3 x 3 + β 4 x 4 + γ 1 x γ 2 x γ 3 x γ 4 x δ 12 x 1 x 2 + δ 13 x 1 x 3 + δ 14 x 1 x 4 + δ 23 x 2 x 3 + δ 24 x 2 x 4 + δ 34 x 3 x 4
20 Results Number of plant species with response functions abiotic database ph + N-total: 406 ph + CN ratio: 330 ph + NO 3 : 146 Bioscore database ph + N-total: 2306 ph + CN ratio: 2309 ph + NO 3 : 1781
21 3. Preselect species in PROPS calculations 2300 species with response functions a-priori selection of species is required EUNIS classification is used in M&M work species selection related to EUNIS
22 Step 1:Overlaying overlay of EUNIS map (level 2; e.g. B1) with Map for the Natural Vegetation for Europe. this gives per level 2 EUNIS class all possible vegetation types combine overlay with list of Level 3 EUNIS classes (e.g. B1.1) Wieger screened the remaining 7000 (!) combinations
23 Step 2: species assignment For each unit of the EuroVegMap units we got a list of typical/relevant species These can be linked to the PROPS list
24 In VSD+Studio it is implemented as follows:
25
26 Species options
27 Summary PROPS response functions (ph, N, T, prec.) for 2300 species a-priori selection of species based on vegetation type relatively few species for Scandinavia, Iberic peninsula, south-east of Europe
28 Thanks (VSD+ PROPS training session on wednesday afternoon)
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