Amending greenroof soil with biochar to affect runoff water quantity and quality
Autor: | Gwynn R. Johnson, Deborah A. Beck, Graig Spolek |
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Rok vydání: | 2010 |
Předmět: |
Carbon Sequestration
Conservation of Natural Resources Nitrogen Health Toxicology and Mutagenesis Rain Stormwater Toxicology complex mixtures Sedum Phosphates Soil Nutrient Biochar Lolium Water pollution Environmental Restoration and Remediation Nitrates fungi Water Pollution Phosphorus General Medicine Pollution Carbon Agronomy Charcoal Facility Design and Construction Soil water Environmental science Water quality Soil fertility Surface runoff Water Pollutants Chemical |
Zdroj: | Environmental pollution (Barking, Essex : 1987). 159(8-9) |
ISSN: | 1873-6424 |
Popis: | Numbers of greenroofs in urban areas continue to grow internationally; so designing greenroof soil to reduce the amount of nutrients in the stormwater runoff from these roofs is becoming essential. This study evaluated changes in extensive greenroof water discharge quality and quantity after adding biochar, a soil amendment promoted for its ability to retain nutrients in soils and increase soil fertility. Prototype greenroof trays with and without biochar were planted with sedum or ryegrass, with barren soil trays used as controls. The greenroof trays were subjected to two sequential 7.4 cm/h rainfall events using a rain simulator. Runoff from the rain events was collected and evaluated. Trays containing 7% biochar showed increased water retention and significant decreases in discharge of total nitrogen, total phosphorus, nitrate, phosphate, and organic carbon. The addition of biochar to greenroof soil improves both runoff water quality and retention. |
Databáze: | OpenAIRE |
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