ArticleFrontiers in microbiology2026
Effects of biochar-based amendments on enzyme activity, microbial biomass, and bacterial communities in mildly cadmium-contaminated paddy soils.
Article in Frontiers in microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mild cadmium (Cd) contamination seriously restricts the safe utilization of paddy soils in southern China. Biochar materials can immobilize soil Cd, yet a single biochar often exhibits limited comprehensive improvement effects. At present, field studies systematically revealing how composite biochar amendments regulate soil enzyme activity, microbial biomass, and bacterial communities remain insufficient. This study aims to clarify the responses of soil enzyme activity, microbial biomass, and bacterial community structure to compound biochar amendments under rice-rape rotation field conditions. We hypothesize that composite amendments consisting of biochar, rape organic fertilizer (ROF), calcium magnesium phosphate fertilizer (CMPF), and fulvic acid (MFA) can optimize soil microhabitat, reduce Cd bioavailability, activate nutrient cycling-related enzymes, and stabilize soil bacterial community diversity. Three different types of biochar, maize straw biochar, bamboo biochar, and coconut shell activated carbon, were mixed with ROF, CMPF, and MFA according to certain proportions, respectively. The results revealed that biochar-based amendments significantly increased urease activity by 19.95%-42.09% (
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