One biochar treatment kept pulling methane from the air for 12 years
Wu H, Xiao W, Li X, Fu M, Xu CY
Soil Health
If you've ever tossed charcoal-like biochar into a garden bed or compost pile, this study shows that single addition can keep quietly scrubbing a greenhouse gas from the soil air for over a decade, not just one season.
Researchers mixed charred plant material, called biochar, into forest soil just once, twelve years ago, at two different amounts. They found that the soil was still soaking up more methane from the air than untreated soil, and the higher dose worked even better. The biochar seems to feed and support methane-eating soil microbes, giving the forest floor a long-lasting boost at trapping this greenhouse gas.
Key Findings
Over a 12-year field trial, 30 t/ha biochar increased annual mean CH4 uptake flux by 56.0% and cumulative annual uptake by 76.4% versus untreated soil; 10 t/ha biochar increased cumulative uptake by 24.9%.
The higher biochar dose raised abundance of methane-oxidizing microbes (pmoA gene) by 56.5% and methane oxidation potential by 170.5%, without changing the overall methanotroph community structure.
Structural equation modeling showed biochar boosted methane uptake both directly and indirectly, by raising soil extractable organic carbon and methanotroph abundance (total effect = 0.60).
chevron_right Technical Summary
A single application of biochar to subtropical forest soil kept boosting the soil's ability to absorb methane, a potent greenhouse gas, for at least twelve years. Higher doses worked better, nearly doubling methane uptake compared to untreated soil.
Abstract Preview
Original paper
Single biochar application enhances soil methane sink and underlying microbial mechanisms in a subtropical forest after twelve years of treatments.
Biochar is an effective amendment for enhancing soil carbon sequestration and regulating soil greenhouse gas emissions, such as methane (CH4), yet its decadal-scale effects in forest ecosystems rem...
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