Effects of Biochar Addition on Cd Enrichment in Lettuce

doi:10.11924/j.issn.1000-6850.casb2022-0413

Abstract

Abstract:

To investigate the effect of biochar addition on the absorption and accumulation of Cd in lettuce under Cd stress, lettuce was used as the experimental material. By pot experiment, 0%, 1%, 2%, and 3% of biochar were added to the soil with exogenous Cd content of 3 mg/kg, respectively. After the lettuce was harvested, the data of soil pH, soil organic carbon, lettuce yield, Cd enrichment and translocation in lettuce, and the occurrence form of Cd in soil were measured. The results showed that the addition of biochar could significantly increase the content of soil organic carbon (P≤0.05). When the biochar addition amount was 3%, the soil organic carbon increased by 35.14%-40.87% compared with that of the CK group. The addition of biochar significantly reduced the Cd content of lettuce. Especially the addition of 3% of biochar, which could reduce the Cd content of lettuce leaves from 0.79 mg/kg to 0.44 mg/kg. Biochar can significantly reduce the enrichment factor and translocation factor of Cd in lettuce, increase the content of residual Cd, and significantly reduce the content of acid-extractable, reducible and oxidizable Cd. Therefore, the addition of biochar has a significant inhibitory effect on soil Cd contamination and Cd accumulation in lettuce, and 3% of biochar addition has the best effect.

Key words: Cd-contaminated soil, biochar, Cd enrichment in lettuce, soil Cd form, pot test

TENG Bingqin, MA Qianqian, WU Jun, DUAN Xuejiao, BI Dongmei, CAI Liqun. Effects of Biochar Addition on Cd Enrichment in Lettuce[J]. Chinese Agricultural Science Bulletin, 2023, 39(6): 90-96.

Figures/Tables 7

References 28

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处理	生物质炭用量/(g/kg)	Cd浓度/(mg/kg)
CK	0	3
B10	10	3
B20	20	3
B30	30	3

处理	生物质炭用量/(g/kg)	Cd浓度/(mg/kg)
CK	0	3
B10	10	3
B20	20	3
B30	30	3

处理	酸可提取态	可还原态	可氧化态	残渣态
CK	2.353a±0.013	0.152a±0.001	0.072a±0.001	0.432d±0.002
B10	2.329a±0.007	0.150a±0.002	0.068b±0.001	0.528c±0.001
B20	2.053b±0.017	0.150a±0.003	0.062c±0.001	0.678b±0.019
B30	1.841c±0.003	0.116b±0.005	0.058d±0.001	0.904a±0.001

处理	酸可提取态	可还原态	可氧化态	残渣态
CK	2.353a±0.013	0.152a±0.001	0.072a±0.001	0.432d±0.002
B10	2.329a±0.007	0.150a±0.002	0.068b±0.001	0.528c±0.001
B20	2.053b±0.017	0.150a±0.003	0.062c±0.001	0.678b±0.019
B30	1.841c±0.003	0.116b±0.005	0.058d±0.001	0.904a±0.001

	根部镉含量	pH	SOC	酸可提取态	可还原态	可氧化态	残渣态
叶部镉含量	0.951^**	-0.947^**	-0.926^**	0.868^**	0.653*	0.921^**	-0.905^**
根部镉含量		-0.983^**	-0.988^**	0.962^**	0.816^**	0.975^**	-0.989^**
pH			0.957^**	-0.976^**	-0.787^**	-0.967^**	0.971^**
SOC				-0.941^**	-0.863^**	-0.948^**	0.978^**
酸可提取态					0.827^**	0.949^**	-0.973^**
可还原态						0.768^**	-.0853^**
可氧化态							-0.956^**