Impact of Biochar Amendment on Soil Properties and Organic Matter Composition in Trace Element-Contaminated Soil

• Published in: International journal of environmental research and public health Vol. 19; no. 4; p. 2140
• Main Authors: De la Rosa, José M, Santa-Olalla, Arturo, Campos, Paloma, López-Núñez, Rafael, González-Pérez, José A, Almendros, Gonzalo, Knicker, Heike E, Sánchez-Martín, Águeda, Fernández-Boy, Elena
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 14.02.2022; MDPI
• Subjects: Acidic soils; Bioavailability; Charcoal; Composition; Contaminants; Contamination; Environmental impact; Fourier transforms; Habitat corridors; Heavy metals; Humic acids; Loam soils; Metals; Mining accidents & safety; Moisture content; Molecular structure; Organic carbon; Organic matter; Organic soils; Sediment pollution; Soil amendment; Soil chemistry; Soil contamination; Soil organic matter; Soil pH; Soil pollution; Soil properties; Soil water; Spectrum analysis; Total organic carbon; Trace elements; Vegetation; Spain; humic acids; degraded soil; pyrogenic C; soil organic matter; heavy metals; carbon sequestration
• ISSN: 1660-4601; 1661-7827; 1660-4601
• DOI: 10.3390/ijerph19042140

The application of biochar as an organic amendment in polluted soils can facilitate their recovery by reducing the availability of contaminants. In the present work, the effect of biochar application to acid soils contaminated by heavy metal spillage is studied to assess its effect on the quantity and composition of soil organic matter (SOM), with special attention given to soil humic acids (HAs). This effect is poorly known and of great importance, as HA is one of the most active components of SOM. The field experiment was carried out in 12 field plots of fluvisols, with moderate and high contamination by trace elements (called MAS and AS, respectively), that are located in the Guadiamar Green Corridor (SW Spain), which were amended with 8 Mg·ha of olive pit biochar (OB) and rice husk biochar (RB). The results indicate that 22 months after biochar application, a noticeable increase in soil water holding capacity, total organic carbon content, and soil pH were observed. The amounts of oxidisable carbon (C) and extracted HAs in the soils were not altered due to biochar addition. Thermogravimetric analyses of HAs showed an increase in the abundance of the most thermostable OM fraction of the MAS (375-650 °C), whereas the HAs of AS were enriched in the intermediate fraction (200-375 °C). Spectroscopic and chromatographic analyses indicate that the addition of biochar did not alter the composition of the organic fraction of HAs, while Cu, Fe, and as were considerably accumulated at HAs.