vegetation composition of extensive green roofs in oslo, norway / defense of master thesis
TRANSCRIPT
Vegetation composition of
extensive green roofs in Oslo,
Norway
Master thesis in Environmental Science by Marina Bakhtina
Supervisor Associate Professor Stefanie Reinhardt
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University College of Southeast Norway 29-08-2016
University College of Southeast Norway Marina Bakhtina 29-08-2016
▹ Introduction
▹ Material and Methods
▹ Results and
Discussion
▹ Conclusion
Outline
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Outline
University College of Southeast Norway Marina Bakhtina 29-08-2016
What is a green roof ?
Photo on the roof of Barcode project, Oslo
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Introduction
University College of Southeast Norway Marina Bakhtina 29-08-2016
Extensive Semi-intensive Intensive
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Classification Introduction
Illustration: www.zinco-greenroof.co.uk Illustration: www.bergen.kommune.no
University College of Southeast Norway Marina Bakhtina 29-08-2016
One type of structure
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Introduction
Illustration: http://designmeans.com/work/illustration/green_roof.html
University College of Southeast Norway Marina Bakhtina 29-08-2016
Vegetation
Sedum-moss typeSpecies composition:▹ Sedum ▹ Phedimus▹ Hylotephium
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Introduction
University College of Southeast Norway Marina Bakhtina 29-08-2016
“Objectives of the study
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Introduction
▹ Has the vegetation composition on the studied EGRs changed after
it has been established?
▹ How has the composition changed?
▹ What is the relation between vegetation composition and
environmental variables?
University College of Southeast Norway Marina Bakhtina 29-08-2016
Data collectionfrom
companies and roof owers
▹ Area▹ Year of installation▹ Type of Sedum mat▹ Type of green roof system and soil depth▹ Flat roof and roof with slope▹ Annual maintenance
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Materials and Methods
University College of Southeast Norway Marina Bakhtina 29-08-2016
18 roofs, 92 plots
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Materials and Methods
Google map
University College of Southeast Norway Marina Bakhtina 29-08-2016
Data collection from fieldwork
▹ Floristic sampling▹ Soil sampling, every second
plot▹ Depth of soil - 3
measurements▹ Sun and shade exposure
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University College of Southeast Norway Marina Bakhtina 29-08-2016
Species groups
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Materials and Methods
▹ Originally Planted species
▹ Spontaneously Established species
University College of Southeast Norway Marina Bakhtina 29-08-2016
46 samples to measure:▹ pH▹ Nutrients (P, K, Mg and
Ca)▹ Organic matter▹ Specific weight
Soil analysis
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Materials and Methods
University College of Southeast Norway Marina Bakhtina 29-08-2016
▹ Ordinations▹ Regressions ▹ Comparison of mean
values and median values
Statistical analysis
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Materials and Methods
Results and discussion
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Results and Discussion
Species group Richness of originally planted species
Richness found planted species and SES (observed during fieldwork)
Succulents 15 10
Herbs 0 43
Graminoids 0 10
Woody plants 0 5
Bryophytes 0 25
Lichens 0 3
Sum 15 96
Species richness
University College of Southeast Norway Marina Bakhtina 29-08-2016
Abundance of Originally Planted Speciesin prefabricated Sedum mats
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Results and Discussion
49% 51%
Less than 80%80%
or more
80%or more
How it has changed
University College of Southeast Norway Marina Bakhtina 29-08-2016
Black list
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Results and Discussion
▹ Phedimus hybridus SE▹ Phedimus spurius SE
▹ Epilobium ciliatum SE▹ Senecio viscosus HI
Red list▹ Veronica verna NT
University College of Southeast Norway Marina Bakhtina 29-08-2016
Vegetation
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University College of Southeast Norway Marina Bakhtina 29-08-2016
Variables
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Vegetation▹ Abundance in % of
species and species groups
▹ Richness in species groups
▹ Richness of originally planted vegetation and growing species
Environment▹ Mean soil depth▹ Nutrients (P, K, Mg, Ca) ▹ pH▹ Dry matter ▹ Loss on ignition▹ Elevation▹ Sun/shade▹ Flat/Slope▹ Area▹ Type of green roof system▹ Company▹ Age
Results and Discussion
Originally planted vegetation▹ Type of sedum mix
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PCA
Results and Discussion
PCA
University College of Southeast Norway Marina Bakhtina 29-08-2016
DCA
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Results and Discussion
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Photo from ZinCo website
Usual plot
Results and Discussion
Outlier
University College of Southeast Norway Marina Bakhtina 29-08-2016
Soil depth
Results and Discussion
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University College of Southeast Norway Marina Bakhtina 29-08-2016
pH
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Results and Discussion
University College of Southeast Norway Marina Bakhtina 29-08-2016
Age
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Results and Discussion
University College of Southeast Norway Marina Bakhtina 29-08-2016
Age
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Results and Discussion
University College of Southeast Norway Marina Bakhtina 29-08-2016
“Summary
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Conclusion
▹ Has the vegetation composition on the studied EGRs changed after it has been established?
Yes
▹ How has the composition changed?
SES have established on roofs51% of studied plots experience decrease in originally planted species abundanceRichness of originally planted species decrease, but richness in total increase
▹ What is the relation between vegetation composition and environmental variables?
The most statistically significant for species distribution are type of sedum mix, soil depth, ph, loss on ignition, K and P levels and age
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Thank you!
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Contact information
https://marinabakhtina.wordpress.com