Riparian forests as a nature-based solution for climate change mitigation and adaptation in cities and their surroundings

Transcription

1 Riparian forests as a nature-based solution for climate change mitigation and adaptation in cities and their surroundings Dagmar Haase Humboldt Universität zu Berlin and Helmholtz Centre for Environmental Research UFZ

2 Riparian forests as a nature-based solution for (climate change) mitigation and adaptation in cities and their surroundings Dagmar Haase Humboldt Universität zu Berlin and Helmholtz Centre for Environmental Research UFZ

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10 Why riparian forests? Belong to the most complex ecosystems existing on the planet Enormous regulation potential as it is their nature being regulator, buffer, transmitter, translocation area, sink and source and of course also habitat

11 Why riparian forests in cities? Belong to the most complex ecosystems existing on the planet Enormous regulation potential as it is their nature being regulator, buffer, transmitter, translocation area, sink and source and of course also habitat Cities develop into the human habitat, places of contact between humans and nature, cities are own metabolic bodies

12 Ecosystem services provided by riparian forests Cooling element (leaf area index, ETP) Air filter (NO x, SO x, O 3, particles etc.) Matter flux regulator (trees, soil, groundwater) Matter sink (carbon, pollutants) Metabolic body for nutrient fluxes Habitat for many species including humans Flood/drought moderator

13 RF as air cooling factors

14 10 8 Temperature reduction potential of urban parks in Leipzig (Aug 09; max. 32 C) Temperaturdifferenz ( C) :31:17 9:01:17 10:31:17 12:01:17 13:31:17 15:01:17 16:31:17 18:01:17

15 Air cooling

16 Weber, Haase, Franck, 2014

17 Weber, Haase, Franck, 2014

18 Urban treesʹ role as air filter

19 Urban treesʹ role as air filter

20 Urban treesʹ role as air filter

21 3 RF as matter flux regulator

22 Arsen in the riparian sediment of the Mulde river and its tributaries 1992 Arsen in the riparian sediment of the Mulde river and its tributaries 2003

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24 suspended material In the Elbe river during the flood 2002

25 RF as hazard moderator Sommer et al. 2009

26 RF as hazard moderator Sommer et al. 2009

27 RF as habitat and place for biodiversity

28 What options do we have to use the knowledge about the benefits riparian forests create for humans in cities as NBS? (1) Save them! (2) Get inspired by their functionning in top situations and inner city areas (3) Combine sectors/ways of functioning/ intervention: Complementarity of nature-technology-humans

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30 Bioretention swales

31 Infiltration trenches

32 Constructed wetlands

33 Constructed wetlands

34 Take home messages Riparian forests and wetlands in cities are extremely precious remnants need conservation, first and foremost! Knowledge about their balancing, buffering and metabolic capacities inspires ecotechnology to create mini-wetlands and riparian trenches in areas disconnected from the river

35 Take home messages A combination of C & C (conservation and construction) might be a solution for most of our cities depending on their context We need a co-development and a coproduction to create real societal benefits and acceptance as without the latter we fail in implementation

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37 wetlands can also become a risk factor Extreme floods in Dresden (Elbe basin) in 2002, 2006, 2013

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39 Most danger for an infection Germany Europe

40 Most danger for an infection Germany Europe

41 Publications Lausch A, Haase D, Herzog F, Syrbe R U, Walz U, Blascke T Indicators for process-pattern interactions in landscapes - An integrative perspective. Ecological Modelling 295, Andersson E, McPherson T, Kremer P, Frantzeskaki N, Gomez-Baggethun E, Haase D, Tuvendal M, Wurster D 2015 Scale and Context Dependence of Ecosystem Service Providing Units. Ecosystem Services 12, Weber N, Haase D, Franck U Zooming into the urban heat island: How do urban built and green structures influence earth surface temperatures in the city? Science of the Total Environment 496, Weber N, Haase D, Franck U Assessing traffic-induced noise and air pollution in urban structures using the concept of landscape metrics. Landscape and Urban Planning 125, Kroll F, Müller F, Haase D, Fohrer N Rural-urban gradient analysis of ecosystem services supply and demand dynamics. Land Use Policy 29(3), doi: /j.landusepol Strohbach M W, Haase D Estimating the carbon stock of a city: a study from Leipzig, Germany. Landscape and Urban Planning 104, doi: /j.landurbplan Kubal T, Haase D, Meyer V, Scheuer S Integrated urban flood risk assessment transplanting a multicriteria approach developed for a river basin to a city. Nat. Hazards Earth Syst. Sci. 9, Haase D, Gläser J Determinants of floodplain forest development illustrated by the example of the floodplain forest in the District of Leipzig. Forest Ecol. Manage. 258, , doi: /j.foreco Haase D Effects of urbanisation on the water balance a long-term trajectory. Environment Impact Assessment Review 29, Haase D, Nuissl H Does urban sprawl drive changes in the water balance and policy? The case of Leipzig (Germany) Landscape and Urban Planning 80, Haase D Holocene floodplains and their distribution in urban areas functionality indicators for their retention potentials. Landscape & Urban Planning 66, 5-18.

42 Thank you for listening. Questions?