Concepts for defining habitat distribution and validating habitat cluster potential

Transcription

1 23th CCE Workshop Copenhagen, Concepts for defining habitat distribution and validating habitat cluster potential T. Scheuschner, German NFC

2 Structure: - Introduction - Work for the current CCE call - Habitat cluster approach - Conclusions & remarks 2

3 Classical Model chain: GrowUp! v MetHyd v 1.3 VSD+ v BERN v 3.3 CL - SMB CL - dynamic Biotic response 3

4 Data collection: - work in progress - ICP Forest - ICP IM - Other projects - various eco-regions - various land cover - 20 Sites 4

5 Using VSD+ and design scenarios: Scenario: Liming Zero Basis Continues S and N deposition Plot: ICP IM Neuglobsow 5

6 Preliminary results: 6

7 Preliminary results: Vitality = 80 % 7

8 Number of species: - In an early state ecological succession the number of species is the highest - Several processes set an ecosystem back to early stage succession - Changes in deposition - Changes in management - Natural disturbances - Do we want a permanent primary succession to reach a high level of number of species? 8

9 Preliminary results: 9

10 Preliminary results: Q: - How representative is this plot? - For which region or habitat type? - How can we link it to the biodiversity discussion? A: - Describe the habitat more precisely (parameterization) - Define input data and derive parameters and habitat suitability - Look for matches (spatial vs. likelihood) 10

11 Background: BASt project: Project principal: Project partners: 11

12 Background: - 58 different habitat types (NATURA 2000) - 11 Climatic zones - 72 Soil forms (type + parent material) natural and semi-natural plant communities

13 Parameterization of the climate zone: Temperature and Precipitation Additional parameters: Vegetation period, de Martonne Index, Water balance 13

14 Parameterization of the soil type: Nutrient condition Acid-alkaline status Hydrology Label C/N min C/N max eutroph >10 17 mesotroph >17 24 oligotroph >24 Label ph min ph max Bsat min BS max Poor 3,2 <3,8 5 <25 Average 3,8 <4,8 20 <55 Rich 4,8 <6 50 <80 Calcareous 6 > Label Watercontent anhydromorph 0,42 hydromorph >0,42 14

15 Extraction and derivation of the parameters: Preparation: - Define analysis grid (1x1km) on basis of GWS grid - Intersect with CORINE and Soil classification map - Exclude marginal polygons (e.g. < 10m²) Analysis: - Implementation of the defined membership functions (each parameter and habitat type) - Model the overall suitability for each habitat type - Define suitability classes

16 Preliminary results: 16

17 Neighborhood analysis: Cell without status Cell with status (good suitability) Cell with status (acceptable suitability) Cell with status (bad suitability)

18 Habitat Habitatnetwork cluster 18

19 Conclusions & remarks: - How can we use this approach - Ways of extension - Next steps - General remarks 19

20 Thank you for your attention For further information please contact or to 20

21 Ways of combining membership functions:

22 Clements' theory of succession/mechanisms of succession In 1916, Frederic Clements published a descriptive theory of succession and advanced it as a general ecological concept. His theory of succession had a powerful influence on ecological thought. Clements' concept is usually termed classical ecological theory. According to Clements, succession is a process involving several phases: Nudation: Succession begins with the development of a bare site, called Nudation (disturbance). Migration: It refers to arrival of propagules. Ecesis: It involves establishment and initial growth of vegetation. Competition: As vegetation became well established, grew, and spread, various species began to compete for space, light and nutrients. This phase is called competition. Reaction: During this phase autogenic changes affect the habitat resulting in replacement of one plant community by another. Stabilization: Reaction phase leads to development of a climax community. 22