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Impact of wood-derived biochar on the hydrologic performance of bioretention media: Effects on aggregation, root growth, and water retention by Derya Akpinar; Jing Tian; Elizabeth Shepherd; Paul T. Imhoff is a Environmental Science article available to read on EtoBox.

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Bioretention systems are one example of green stormwater infrastructure that may mitigate the hydrologic impact of stormwater runoff. To improve water retention while maintaining rapid stormwater infiltration, conventional bioretention soil media (BSM) might be augmented with biochar. Biochar may improve the BSM's structure by increasing soil aggregation, which might improve water retention and increase stormwater infiltration while also improving root growth. Pots with BSMs representing high and moderate sand content media were amended with a wood-derived biochar, planted with switchgrass, and subjected to weekly storms for 20 weeks, followed by a 10-week drought. In the high sand content medium (NC mix), biochar amendment increased hydraulic conductivity (K sat ), and this effect increased with time. At 0 weeks, 2% and 4% (w/w) biochar increased K sat by 4 ± 2% and 10 ± 4%, respectively, while at 30 weeks the increase was 30 ± 10 and 70 ± 20%, respectively, above biochar-free media. Similar improvements were seen in plant available water (PAW) in NC mix. However, minimal improvements in K sat and PAW from biochar amendment were found in the moderate sand content BSM that containe

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Author

Derya Akpinar; Jing Tian; Elizabeth Shepherd; Paul T. Imhoff

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)