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Biochar, a soil conditioner containing significant amounts of polycyclic aromatic hydrocarbons (PAHs), has gained widespread popularity in agricultural practices due to its advantages in improving soil fertility and carbon sequestration. While biochar may increase soil black carbon (BC) and PAH contents, the quantitative accumulation of BC and PAHs in different soil environments under varying biochar addition dosages remains poorly understood. Here, we investigated the content and composition of black carbon (evaluated using benzene polycarboxylic acids, BPCAs) and PAHs in soils treated with different biochar addition dosages from two long-term experimental farmlands in Ningxia (5-year) and Shandong (7- and 11-year), China. Results showed that increasing cumulative biochar dosage caused elevated contents of black carbon and PAHs, accompanied by decreases in their retention efficiencies. Contrasting retention was observed between sites, with the Shandong site characterized by higher retention efficiencies of BPCAs and lower retention efficiencies of PAHs, possibly owing to its higher temperature, more sandy soil texture, less irrigation, and lower sunlight intensity. Despite both black carbon and PAHs originating from biochar and sharing similar condensed aromatic structures, there was no significant correlation between the contents of black carbon and PAHs, indicating distinct behaviors and fates of these compounds. These findings emphasize the importance of optimizing biochar addition dosages and considering site-specific environmental factors for effective soil black carbon sequestration through biochar application. Highlights: Increasing biochar dosage caused higher black carbon and PAH contents but lower retention efficiencies. The retention efficiencies of black carbon and PAHs were highly site-dependent. Optimal biochar dosages and site-specific considerations are crucial for effective soil carbon sequestration. [ABSTRACT FROM AUTHOR]

The article present the discovery of the Archean Magmatic Cu-Ni Sulfide deposit in China. Topic include the formation ages of magmatic sulfide deposits are from Proterozoic to Mesozoic; and study was supported by the National Science Foundation of China (41862005, 41872089 and 41702091), Yunnan Applied Basic Research Project (2018FB079) and China Geological Survey (DD20160346).