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Your search keyword '"Hou, Lijun"' showing total 14 results
Start Over Author "Hou, Lijun" Journal environmental pollution
14 results on '"Hou, Lijun"'

14. The benefits of biochar: Enhanced cadmium remediation, inhibited precursor production of nitrous oxide and a short-term disturbance on rhizosphere microbial community.

Author

Hou, Lijun, Zhang, Liping, Chen, Xiaotian, Li, Xuewen, ZengqiangZhang, and Lin, Yan Bing

Subjects
NITROGEN cycle, SOIL microbial ecology, BIOCHAR, MICROBIAL communities, NITROUS oxide, HEAVY metals removal (Sewage purification), RHIZOSPHERE
Abstract

Biochar has the potential to remediate heavy metals in agricultural soil and mitigate nitrous oxide (N 2 O) emissions; however, the effects of biochar on heavy metal remediation, the soil microbial community and N 2 O emissions are not completely understood. In this study, we conducted a pot experiment in which Glycine max L. (soybean) was cultivated in two cadmium (Cd)-contaminated soils (low, 3.14 mg kg−1; high, 10.80 mg kg−1) to investigate the effects of biochar on the bioremediation of Cd, N 2 O emissions and the rhizosphere microbial community structure. The bioaccumulation of Cd in the plant shoots and roots increased with all biochar addition rates (0%, 1%, 5% and 10%); unexpectedly, the translocation capacity of Cd to the edible parts of the plant significantly decreased to 0.58 mg kg−1, which was close to the edible threshold (0.4 mg kg−1). The abundance and activities of functional marker genes of microbial nitrification (amoA) and denitrification (nirK, nirS and nosZ) were quantified with quantitative PCR, and we found that biochar addition reduced the precursor production of rhizoshpere N 2 O by inhibiting the transcription of the nirK gene. In addition, the nitrogenase activity during anthesis (S) was significantly (P < 0.05) increased with 1% (v/v) biochar addition. Noticeably, biochar addition only changed the microbial community structure in the very first stage before eventually stabilize. This study highlighted that biochar has the potential ability to maintain the quality of agricultural crops, remediate Cd-contaminated soils and may help reduce N 2 O emissions without disturbing the microbial community. Image 1 • Biochar increased nitrogenase activity of soybean planted in Cd-polluted soil. • Cd translocation to the edible parts of soybean was reduced by biochar amendment. • Biochar inhibited the transcription efficiency of the gene nirK. • A short-term impact of biochar on microbial community was observed. [ABSTRACT FROM AUTHOR]

Published
2021
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