Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 229, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2021.113058
Keywords
Natural sulphur-rich biochar; Rhizosphere paddy soil; Mercury pollution; Microbial community; Co-occurrence network
Categories
Funding
- Beijing Natural Science Foundation [8212040]
- National Natural Science Foundation of China [41977030]
- National Key Research and Development Program of China [2017YFA0605003]
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This study found that amendment with NSBC can reduce the toxic effects of Hg in soil, increase microbial abundance, and the decrease in Hg content has the most significant impact on bacterial taxonomic attributes. Furthermore, the addition of NSBC helps to improve the structure of soil microbial communities.
Biochar and sulphur (S) are important factors regulating the level, speciation and transformation of mercury (Hg), leading to alterations in the assemblage of the soil microbial community. However, variations in the taxonomic attributes of the rhizosphere soil bacterial community arising from the Hg speciation in paddy soil, amended with natural S-rich biochar (NSBC) derived from the pyrolysis of S-rich oilseed rape straw, remain unclear. Herein, a rice pot experiment was conducted. Hg-polluted paddy soils were amended with NSBC and low-S biochar (LSBC) to evaluate the role of Hg chemical form affected by NSBC in regulating the taxonomic attributes of rhizosphere soil, including microbial abundance, composition, and ecological clusters within the co-occurrence network of microbial communities. Results showed that microbial abundance was higher in soils with lower Hg levels, and mean increases of 149 observed operational taxonomic units (OTUs) and 238 predicted OTUs (Chao 1) were observed, with a 1 mg kg-1 decrease in the total Hg (T-Hg) content. Among the 13 predictor variables, the T-Hg content was the strongest and most consistent predictor of the bacterial taxonomic attributes. This finding may be attributed to the fact that the drastic reduction in T-Hg and Hg bioavailability induced by NSBC results in the decrease of Hg stress on the soil microbiome. Moreover, NSBC amendment shifted the ecological clusters toward the amelioration of Hg pollution.
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