Use of Biochar Derived from Spartina Alterniflora to Reduce Sediment Methane (CH4) Production Potential During Non-Farming Period in Earthen Aquaculture Ponds
ENVIRONMENTAL POLLUTION(2025)
Fujian Normal Univ
Abstract
Biochar has been proposed as an effective material for mitigating greenhouse gas emissions from farmlands, but comparable information for earthen aquaculture ponds is limited. A field study was conducted to investigate the effects of adding biochar (200-1600 kg ha- 1) derived from the invasive plant Spartina alterniflora on sediment physico-chemical properties, CH4 production potential (PCH4), and the relevant functional gene abundances in earthen aquaculture ponds during the non-farming period. The results indicated that biochar treatments increased sediment porosity and salinity, while decreasing dissolved organic carbon and microbial biomass carbon. Biochar-treated sediments also exhibited a significantly lower abundance of mcrA gene especially in the early drainage stage, and a higher abundance of pmoA gene especially in the intermediate and final drainage stages. Consequently, the mean PCH4 in biochar-treated sediments (1.28-21.12 ng g- 1 d- 1) was 57-73% lower than in the control group (5.41-39.45 ng g- 1 d- 1). The reduction in PCH4 did not differ between biochar produced at 300 degrees C vs. 500 degrees C and was not dependent on the amount of biochar added. The findings suggest that using biochar derived from S. alterniflora can be a cost-effective method to control the spread of this invasive plant and reduce CH4 production in aquaculture pond sediment during the non-farming period.
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Key words
Biochar,Methane production,mcrA and pmoA gene abundance,Greenhouse gas mitigation,Aquaculture pond
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