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- Title
Impact of Biochar Addition on the Extractable Forms of Cadmium in Red Paddy Soil Aggregates.
- Authors
Chen, Can; Dai, Ziqiang; Cai, Peng
- Abstract
This study was conducted to understand the impact of biochar addition on the extractable forms of cadmium (Cd) in red paddy soil aggregates. Biochar was added once at five treatment rates (0, 10, 20, 30, and 40 t ha−1) in the soil surface (0–17 cm) and subsurface (17–29 cm) layers, before rice cultivation in March 2020. Soil samples were collected from both layers at rice maturity in October 2020. Soil physicochemical properties were measured according to Bao's method. The various forms of cadmium were extracted by modified European Community Bureau of Reference (BCR) method, determined by ICP-MS. Soil aggregates were separated by wet sieving. The results showed that soil pH, soil organic matter (SOM), and cation exchange capacity (CEC) in both soil layers increased with the rate of biochar addition. Biochar applied at the high rate of 40 t ha−1 was the most effective in both soil layers. Biochar can promote the transformation of acid-soluble Cd forms into reducible and oxidizable forms in the soil. Correlation was analyzed between all fractions of Cd and soil physicochemical properties. The results showed that soil pH, SOM, and CEC were significantly correlated with different forms of Cd. Biochar can promote Cd transformation to stable, less mobile forms, especially in < 0.053 mm, 0.053–0.25 mm, and 0.25–1 mm aggregates.
- Subjects
EUROPEAN Community; RED soils; SOIL structure; BIOCHAR; EUROPEAN communities; SOIL acidity; SOILS
- Publication
Water, Air & Soil Pollution, 2023, Vol 234, Issue 4, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-023-06294-9