Mixing grasses with legumes supercharges oil spill cleanup
Bulu YI
Phytoremediation
If you've ever wondered why restoration projects plant clover alongside grasses on disturbed ground, this is the science behind it: their roots team up with soil microbes to break down pollutants neither plant could handle solo.
Scientists reviewed studies on using plants to clean up soil fouled by crude oil, a process called phytoremediation. Grasses (like the Poaceae family) and legumes (like the Fabaceae family) each do a decent job alone, removing around 60-64% of the oil, but planting them together pushes that number up to about 88%, and even more diverse plant mixes do better still. The roots of these plants feed helpful microbes in the soil, and together they break down or trap the oily pollutants instead of just leaving the mess for machines and chemicals to handle.
Key Findings
Poaceae (grass family) and Fabaceae (legume family) achieved mean remediation efficiencies of 63.81% and 60.78% respectively when used alone.
Combining Poaceae and Fabaceae raised efficiency to approximately 87.55%, far outperforming either family individually.
Diverse multispecies plant assemblages exceeded 88% remediation efficiency, with Asteraceae also identified as a key contributing family.
chevron_right Technical Summary
Grasses and legumes planted together can clean up oil-contaminated soil far better than either family alone, reaching nearly 88% removal of petroleum pollutants, and diverse plant mixes do even better. This offers a cheap, plant-based alternative to digging up and trucking away contaminated land.
Abstract Preview
Original paper
Viability of different plant families as remediators of crude oil-contaminated soil.
Crude oil-contaminated soils represent major environmental and socioeconomic challenges in regions of intensive petroleum exploration, and the sustainable restoration of the ecosystem has become an...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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