Impacts of Landscape Treatments on Plant Species Richness within Road Corridors and Adjacent Ecosystems Rosalyn Thompson University College Cork SIMBIOSYS.

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Presentation transcript:

Impacts of Landscape Treatments on Plant Species Richness within Road Corridors and Adjacent Ecosystems Rosalyn Thompson University College Cork SIMBIOSYS FINAL CONFERENCE Dublin: 28 th June 2012.

Road Verges: 3 Research Areas 1.Species richness: (a) Road Verge vs. Adjacent Land. (b) Pre-guidelines vs. Post-guidelines 2. Contribution of Soil Seed Bank 3. Nutrient status of Soil in Road Schemes Preliminary Conclusions

Research in Context - Background 2006 NRA Produced Guidelines Landscaping of Verge area: Move away from a high input/horticultural approach to one following an Ecological Landscape Design approach. Opportunity in 2009 to study Pre- and Post- guidelines sites.

Research in Context - How slopes were landscaped Traditionally, this involved: finishing engineering aspects covering with topsoil treating with herbicide applying fertilizer planting…. Glenealy Landscaping image: Lego Ecowitch A.C.E.S.

New Approach Use subsoil (soil slopes) or NO soil (rock/scree) Avoid Herbicides and fertilizer Create Open Habitat Mosaics (OHM) incorporating native species of local provenance: Soil Slopes. Allow Natural Recolonisation (NR): Rock/scree Slopes. Soil Slope (OHM) Rock/scree Slope (NR)

Species Richness: Road Verge vs. Adjacent Land Use Rock/Scree Slope Soil Slope Wider verge Margin Centre-improved grasslandCentre-tillage Road Verges Adjacent Fields

Reference Points along Transect Improved grassland Semi-natural grassland 310km Transect west-east

Species Richness: All Road Sites Road Verge Field Margin Field Centre

Species Richness on Road Verges: Soil Slopes – All Species – Comparison of Treatments Mean species richness in semi-natural grasslands Including all species Treatments are different (P> 0.05)

Species Richness on Road Verges: Soil Slopes (II) - Comparison of Treatments Post Treatments are different to Both Pre treatments (P> 0.05) Native species only Mean species richness in semi-natural grasslands

Species Richness Road Verges Rock/scree (native species) Early Summer onlyEarly & Late Summer Treatments are not sig. different (P < 0.05)

2010: Soil collected spring following plant survey. Outdoor germination Below-ground plant community: the contribution of the Soil Seed Bank

Below-ground Plant Community Plants were removed upon germination and identification..or potted on until they could be identified 2 seasons – original seed trays overwintered outside allowing a 2 nd chilling period.

Species QSSB SpeciesQ SSB SpeciesQSSB Aegopodium podagria. Geranium robertianum. Epilobium parviflorum Angelica sylvestris Lythrum salicaria Hypericum humifusum Athyrium filix lemina Rubus fruticosa Juncus effusus Elytrigia repens Teucrium scorodonia Plantago major Hedera Ulex europaeus Poa pratensis Juncus conglomeratus Cardamine flexuosa Scirpus setaceus Lonicera periclymenum Carex pendula Veronica persica Rubus idaeusEpilobium ciliatum Viola riviniana Species recorded Rock face Glebe Co. Kerry (NR): 2009: Quadrats (Q); 2010: Soil Seed Bank Trial (SSB) Species Richness: Q = 8; Both = 5; SSB = 11; TOT = 24

Soil Fertility Subsoil Topsoil Grasslands with higher numbers of native plant species require LOW soil fertility.

Soil Slopes: Soil Nutrient Status [P] Pre-guidelinesPost-guidelines = [P] mg/kg; = Mean Species Richness.

Preliminary Conclusions Higher mean species richness in Road Verge than either Margin or Centre of the adjacent field. Seed bank data important – particularly to NR. Topsoil nutrient status should be determined: (low nutrient status may costs/effort involved in its alternative disposal/incorporation) If POST-GUIDELINES treatments are producing results ≥ PRE-G then POST is to be adopted as the more sustainable approach.

Acknowledgements SIMBIOSYS project (2007-B-CD-1-S1) is part of the Science, Technology, Research & Innovation for the Environment (STRIVE) Programme 2007 – 2013, funded by the Irish Government under the National Development Plan and administered by the Environmental Protection Agency

With thanks to…. Dr Pádraig Whelan (UCC), Professor Mark Emmerson (QUB) - Supervisors Lisa Dolan (UCC) – Research Assistant Dr Nova Sharkey (TCD) – Research Assistant Máiread Kiely (UCC) Senior Technical Officer Plant Science Paul Green (Botanical Society of the British Isles) Steven Darby (Chemistry) Louise Russell, Jovanna Arndt, Dearbhail McKenna, Simon Mills – Field Assistants Mary Hamilton, Aisling O’Shea, Eimear Egan – Greenhouse Assistants Dr Sonia Monteiro, Aisling O’Shea – Lab Assistants All our landowners Kerry, Cork, Waterford and Wexford City and County Councils