Dosage- and site-dependent retention of black carbon and polycyclic aromatic hydrocarbons in farmland soils via long-term biochar addition

Zhang，Jun1,2; Wang，Yinghui1,2; Shi，Yameng1,2; Yang，Biwei1,2; Zhang，Aiping3; Du，Zhangliu4; Zhong，Guangcai5; Luo，Chunling5; Zhang，Gan5; Wang，Junjian1,2

2024-12-01

10.1007/s44246-023-00095-9

Carbon Research   影响因子和分区

2731-6696

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. Graphical Abstract: (Figure presented.)

Benzene polycarboxylic acid Biochar amendment Croplands Polycyclic aromatic hydrocarbons Retention efficiencies

英语

第一 ; 通讯

2-s2.0-85186962055

Scopus

1.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing,100081,China
4.College of Resources and Environmental Sciences,China Agricultural University,Beijing,100193,China
5.State Key Laboratory of Organic Geochemistry and Guangdong-Hongkong-Macao Joint Laboratory for Environmental Pollution and Control,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,510640,China

Zhang，Jun,Wang，Yinghui,Shi，Yameng,et al. Dosage- and site-dependent retention of black carbon and polycyclic aromatic hydrocarbons in farmland soils via long-term biochar addition[J]. Carbon Research,2024,3(1).

Zhang，Jun.,Wang，Yinghui.,Shi，Yameng.,Yang，Biwei.,Zhang，Aiping.,...&Wang，Junjian.(2024).Dosage- and site-dependent retention of black carbon and polycyclic aromatic hydrocarbons in farmland soils via long-term biochar addition.Carbon Research,3(1).

Zhang，Jun,et al."Dosage- and site-dependent retention of black carbon and polycyclic aromatic hydrocarbons in farmland soils via long-term biochar addition".Carbon Research 3.1(2024).