Critical success factors for revegetation of heavily polluted sites.
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1 Critical success factors for revegetation of heavily polluted sites. A cost-benefit analysis tool. Jan Japenga, Paul Römkens, Luc Bonten Soil Science Centre ALTERRA Green World Research, Wageningen University and Research P.O. Box 47, 6700 AA Wageningen, The Netherlands jan.japenga@wur.nl Rafal Kucharski, Alexandra Sas-Novosielska Institute for Ecology of Industrial Areas (IETU), Katowice, Poland sas@ietu.katowice.pl Financed by the EU (PhytoDec project, contract EVK )
2 Background All over the world extended sites exist with extremely high contaminant contents in the soil Many of these sites are unable to sustain vegetation The sites may cause direct and indirect effects on human health and ecosystems, through leaching, erosion etc. Complete clean-up of the sites is generally no economically viable option IS REVEGETAION A SOLUTION?
3 Background REVEGETATION OF DERELICT SITES Soil additives to immobilize contaminants Agronomic rehabilitation Selection of vegetation Cost-benefit considerations Risk containment considerations IS REVEGETAION A SOLUTION?
4 Objectives (I) To assess the viability of revegetation of heavy metal polluted sites, focusing on verifiable critical success factors
5 Objectives (II) To develop a Decision Support System to quantify revegetation benefits in comparison with other soil remediation options
6 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
7 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
8 Critical success factors economic benefits Decreased costs of risk containment at the site after revegetation. Direct market value of vegetation: energy crops (direct or vegetal oil) non-food crops (flowers, fiber crops) Cost categories: Initial costs Recurrent costs Revenues
9 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
10 Critical success factors reduced erosion Basic processes in the erosion model LISEM: rainfall interception surface storage in micro-depressions infiltration, vertical movement of water in the soil overland flow and channel flow (in man-made ditches) detachment by rainfall and throughfall transport capacity and detachment by overland flow.
11 Critical success factors reduced erosion Main input parameters in the erosion model LISEM: slope length slope gradient soil type rain event (type, intensity) vegetation type (shrubs and grass) vegetation cover (0%, 5%, 10%, 20%, 50% and 80%)
12 Critical success factors reduced erosion vegetation type (shrubs and grass) vegetation cover (0%, 5%, 10%, 20%, 50% and 80%) VEGETATION TYPE IS THE ESSENTIAL VARIABLE
13 Critical success factors reduced erosion Vegetation types: GRASSES + perennial species + deep rooting + dense vegetation cover + suitable species available +/- sustainability? (local species?)
14 Critical success factors reduced erosion Vegetation types: LOCAL NATURAL VEGETATION +/- perennial species? +/- deep rooting? +/- dense vegetation cover? + suitable species available (even for extreme pollution levels) + sustainability (ecological restoration)
15 Critical success factors reduced erosion Vegetation types: ENERGY CROPS AND OTHER NON-FOOD CROPS +/- perennial species? +/- deep rooting? + high percentage vegetation cover +/- suitable species available? +/- sustainability? Miscanthus giganteus
16 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
17 Critical success factors reduced leaching Reduced HM leaching is the result of: + phyoevaporation after revegetation + the effect of immobilizing agents +/- rhizosphere phenomena +/- soil structure changes generally: net reduced leaching
18 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
19 Critical success factors crop quality Most important aspect of crop quality is HM content in (parts of) the shoots: food-chain contamination reduced price in the case of energy crops and non-food crops
20 Critical success factors crop quality Hyperacculumator (non-perennial) Non hyperaccumulating grass (perennial)
21 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
22 Critical success factors soil ecosystem functioning In general the soil ecosystem functioning will improve as a consequence of: better nutrient supply (agronomic measures) less bioavailable contaminants in the soil (immobilizing agents) positive effect of rhizosphere (soil life habitat and food supply)
23 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
24 Critical success factors revegetation sustainability Ecological restoration: best chances for local wild species Revegetation: best chances for energy crops and non-food crops
25 Vegetation types overview of vegetation types in relation to Critical Success Factors perennial grasses (local) perennial grasses (non-local) energy crops & non-food crops local natural plant species non-acc. acc. non-acc. acc. non-acc. acc. non-acc. acc. economic benefits reduced erosion /+ -/+ -/+ -/+ reduced leaching /+ -/+ -/+ -/+ crop quality soil ecosystem functioning /+ -/+ -/+ -/+ revegetation sustainability -/+ -/+ -/+ -/+ -/+ -/+ + + ecological benefits -/+ -/
26 Vegetation types non-accumulating local grasses + energy crops perennial grasses (local) perennial grasses (non-local) energy crops & non-food crops local natural plant species non-acc. acc. non-acc. acc. non-acc. acc. non-acc. acc. economic benefits reduced erosion /+ -/+ -/+ -/+ reduced leaching /+ -/+ -/+ -/+ crop quality soil ecosystem functioning /+ -/+ -/+ -/+ revegetation sustainability -/+ -/+ -/+ -/+ -/+ -/+ + + ecological benefits -/+ -/
27 Vegetation types non-accumulating local grasses + energy crops (optimized benefits if erosion is a problem) perennial grasses (local) non-acc. non-acc. energy crops & non-food crops economic benefits economic benefits reduced erosion + -/+ + reduced erosion reduced leaching + -/+ + reduced leaching crop quality crop quality soil ecosystem functioning + -/+ + soil ecosystem functioning revegetation sustainability -/+ -/+ -/+ revegetation sustainability ecological benefits -/+ - -/+ ecological benefits
28 Vegetation types ecological restoration local natural plant species non-acc. grasses/energy crops non-acc. revegetation economic benefits - + economic benefits reduced erosion -/+ + reduced erosion reduced leaching -/+ + reduced leaching crop quality + + crop quality soil ecosystem functioning -/+ + soil ecosystem functioning revegetation sustainability + -/+ revegetation sustainability ecological benefits + -/+ ecological benefits
29 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
30 DSS decision making process the soil pollution problem is detected the need to solve the problem is recognised site characteristics are determined a set of potential solutions is defined merits of potential solutions are quantified = DSS stakeholder bargaining leads to decision output remediation project is carried out and evaluated
31 DSS general aspects of the REC-approach Site input data Remediation technology input data Factors: Risk reduction Environmental merit Costs DSS risk reduction index environmental merit index costs index general index DECISION MAKING
32 DSS comparison between scenarios risk reduction environmental merit costs option 1 option 2 option option 1 option 2 option option 1 option 2 option 3 (dimensionless) (dimensionless) (Meuro) Option 1: Option 3: rich man s choice poor man s choice DECISION
33 DSS risk reduction TOTAL RISK TOTAL RISK Initial situation option 1 option 2 option 3 Final situation soil remediation option 1 recreation soil remediation option 2 recreation nature nature house + garden soil remediation option 3 house + garden land use options land use options
34 DSS risk reduction Comparison of remediation options: 1. dig and dump 2. no action 3. revegetation dig and dump revegetation no action Leaching lower leaching rates after revegetation Direct human uptake of polluted soil decreased after revegetation Risks of food-chain contamination increased (?) after revegetation Land use important for risk estimation!
35 DSS environmental merits Environmental merits (negative or positive) include: production of clean soil/water production of polluted soil/water energy use use of water
36 DSS environmental merits Comparison of remediation options: 1. dig and dump 2. no action 3. revegetation dig and dump revegetation no action Leaching/erosion produced polluted soil and water reduced after revegetation Leaching and erosion (wind/water) calculated by a simple erosion model
37 DSS costs Comparison of remediation options: 1. dig and dump 2. no action 3. revegetation dig and dump revegetation no action Dig and dump by far the most expensive
38 DSS REC dig and dump dig and dump revegetation revegetation no action no action Risk reduction Environmental merits dig and dump Decision making depends on: revegetation no action Costs Local exposure rates (land use) Vulnerability of adjacent areas Capital disponibility Soil economical value
39 Presentation outline I II Critical success factors economic benefits reduced erosion reduced leaching crop quality soil ecosystem functioning revegetation sustainability The Decision Support System (DSS) general structure revegetation in the DSS output General conclusions
40 General conclusions Revegetation is a viable option to decrease transport of heavy metals through wind/water erosion and leaching Revegetation does not reduce the risks at the sites, but only at adjacent sites and adjacent environmental compartments Revegetation is a cost-effective option, whenever sustainability is assured and energy crops / nonfood crops are used
41 General conclusions Revegetation using a mixture of non-hyperaccumulating perennial species and energy crops can prove to give the right balance between erosion control and financial benefits at erosion-sensitive sites Revegetation can be most sustainable if local species are used, which can be a good approach when ecological restoration ids the objective
42 THANK YOU FOR YOUR ATTENTION
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