Effect of Biochar on Passivation and Bioavailability of Cr (Ⅲ) Pollution in Grey Desert Soil

doi:10.11924/j.issn.1000-6850.casb2020-0777

Abstract

Abstract:

The chromium Cr(Ⅲ) pollution of grey desert soil seriously affects the biological activity of the soil. To explore an effective method for the remediation of grey desert soil chromium pollution, a pot experiment was used to explore the effect of biochar application on soil chromium pollution and its bio-availability. The results showed that the application of biochar could significantly reduce the content of water-soluble chromium and the exchanged Cr of chromium-contaminated soil (P<0.05), simultaneously increased the content of reduced chromium (P<0.05). The biological activity coefficient decreased with the increase of temperature (P<0.05), and the decline amplitude was 26.70%, 41.15% and 59.45% respectively. Different biochar treatments significantly reduced the chromium content of corn grains, roots, stems and leaves (P<0.05), especially the chromium enrichment coefficient of corn plants (P<0.05), among which the biochar BC600 produced by high temperature could significantly slow down the growth inhibition caused by Cr pollution, and could significantly increase corn biomass (P<0.05), however the biomass had no significant difference compared with CK (P<0.05). Compared with the addition of chromium alone, the Cr content in maize tissue of BC600 treatment was less than 5 mg/kg, which conformed to the Cr safety standards for feed ingredients. The results could provide a theoretical basis for the soil restoration after chromium pollution in grey desert soil.

Key words: biochar, grey desert soil, chromium Cr(Ⅲ) pollution, passivation, maize, bioavailability

CLC Number:

Ren Jing, Ge Chunhui. Effect of Biochar on Passivation and Bioavailability of Cr (Ⅲ) Pollution in Grey Desert Soil[J]. Chinese Agricultural Science Bulletin, 2021, 37(28): 76-80.

Figures/Tables 6

References 26

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处理	根	茎	叶	籽粒
CK	10.62±1.36ab	46.75±3.47ab	32.45±2.46ab	34.98±2.74a
Cr处理	9.02±1.16b	39.74±2.95b	26.29±2.00c	26.81±1.74b
1%BC300	9.34±1.20ab	41.14±3.06b	28.56±2.17bc	30.78±2.41ab
1%BC450	9.27±1.90ab	41.81±1.50b	30.45±0.85b	33.57±5.79ab
1%BC600	11.26±0.96a	49.09±2.18a	34.22±1.90a	31.85±1.93ab

处理	根	茎	叶	籽粒
CK	10.62±1.36ab	46.75±3.47ab	32.45±2.46ab	34.98±2.74a
Cr处理	9.02±1.16b	39.74±2.95b	26.29±2.00c	26.81±1.74b
1%BC300	9.34±1.20ab	41.14±3.06b	28.56±2.17bc	30.78±2.41ab
1%BC450	9.27±1.90ab	41.81±1.50b	30.45±0.85b	33.57±5.79ab
1%BC600	11.26±0.96a	49.09±2.18a	34.22±1.90a	31.85±1.93ab

处理	根Cr含量	茎Cr含量	叶Cr含量	籽粒Cr含量
CK	1.82±0.06e	0.12+0.01e	0.09+0.02c	0.05+0.00e
Cr处理	56.67+2.63a	7.65+0.32a	13.34+2.22a	1.23+0.06a
1%BC300	39.89+3.52b	4.22+0.47b	9.28+0.95a	0.75+0.02b
1%BC450	32.55+1.85c	3.56+0.11c	6.22+1.08b	0.55+0.08c
1%BC600	26.24+0.68d	2.23+0.16d	4.36+0.35b	0.47+0.03c
饲料Cr标准	5.0	5.0	5.0	5.0

处理	根Cr含量	茎Cr含量	叶Cr含量	籽粒Cr含量
CK	1.82±0.06e	0.12+0.01e	0.09+0.02c	0.05+0.00e
Cr处理	56.67+2.63a	7.65+0.32a	13.34+2.22a	1.23+0.06a
1%BC300	39.89+3.52b	4.22+0.47b	9.28+0.95a	0.75+0.02b
1%BC450	32.55+1.85c	3.56+0.11c	6.22+1.08b	0.55+0.08c
1%BC600	26.24+0.68d	2.23+0.16d	4.36+0.35b	0.47+0.03c
饲料Cr标准	5.0	5.0	5.0	5.0

处理	富集系数	转移系数
CK	0.262	25.66
Cr处理	2.116	21.91
1%BC300	1.305	11.33
1%BC450	0.909	9.22
1%BC600	0.669	7.39