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Natural Resources modeling of heathlands: targets & indicators Gerrit W. Heil Utrecht University.

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Presentation on theme: "Natural Resources modeling of heathlands: targets & indicators Gerrit W. Heil Utrecht University."— Presentation transcript:

1 Natural Resources modeling of heathlands: targets & indicators Gerrit W. Heil Utrecht University

2 ecosystems indicators drivers Stake- holders targets Natural Resources Management scenarios

3 heathlands Manage- ment Diversity Recreation Production canopy cover Heathland managers Heathland Management ecosystem services

4 Sulfur and nitrogen deposition in The Netherlands

5 National Park “Hoge Veluwe” -1979

6 National Park “Hoge Veluwe” -1983

7 100 % trees Calluna grass structure management intensity Conceptual model of heathland management Four land utilization structure types of heathland in relation to management intensity, structural diversity and species composition. Type 1 = open heathland, poor in structural diversity, with Calluna cover > 75%, Type 2 = open heathland, rich in structural diversity, with Calluna cover > 60%, and less than 35% grass cover, Type 3 = a mosaic of heathland, forest (<35% cover) and grassland, Type 4 = forest (cover between 60 and 80%) with patches of heathland

8 Grazing by cattle

9 Table 1: Results of the cluster analysis of vegetation releves differing in: no management or grazing Dry heath wet heath Dry heath grazing > Releve nr Species name 12 Cera font Geni angl Rham fran Sorb aucu Eric tetr Moli caer Gali saxa Hier pilo Pote erec Mela prat Prun sero Rubu ssp Saro scop Quer rubr Amel lama Camp para Quer robu Care pilu Pinu sylv Dant decu Pleu schr Agro vine Call vulg Desc flex Hypn jutl Fest tenu Geni pilo Nard stri Rume acet Betu vern Dicr scop Leuc glau Agro tenu Care aren Clad bacc Clad chlo Clad rang Clad port Camp intr Poly peri Luzu mult Pohl nuta Clad cocc Clad floe Leci ulig

10 Lichen rich Calluna heath

11 Remotely Sensed Image ™ NP Hoge Veluwe for sampling of canopy cover – diversity proxy “Oud Reemstveld” 4000 meters

12 Normalized Difference Vegetation Index

13 Canopy cover - diversity proxy diversityrecreation production

14 Species 1 Species 2 Canopy space Two species competing for canopy space t = 0 Species 1 t = 1 Species 2 Canopy space

15 Structure of heathland meta-model Calluna vulgaris Calluna vulgaris Deschampsia flexuosa Deschampsia flexuosa soil competition beetles seed removal of biomass

16 A Lotka-Volterra competition model for canopy space dN 1 /dt = r 1 N 1 (C-N 1 -N 2 ) / C - β 1 N 1 -δN 1 dN 2 /dt = r 2 N 2 (C-N 2 -N 1 ) / C - β 2 N 2 Where: N 1 and N 2 = canopy cover of two competing species C = maximum canopy cover r = species specific growth rate in relation to nitrogen availability β = species specific mortality rate δ = stochastic outbreaks of heather beetle infestation assumption: both species have the same maximum canopy cover

17 25 kg/ha/yr atmospheric nitrogen deposition

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20 Approach for future NR-modeling

21 Conclusions Setting targets (services) in combination with apparent indicators is important for the success of Natural Resources Management. Natural Resource modeling explicates the potential of indicators to assess the targets. Utrecht University


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