【摘要】 为探究污泥生物炭施入对土壤和作物重金属富集的影响,以砂姜黑土为研究对象,以不施用污泥生物炭为对照(CK),设置添加污泥生物炭质量分数0%、5%、10%、15%和20%进行黑麦草盆栽试验,分析土壤—黑麦草系统重金属富集特征。结果表明,砂姜黑土中施用污泥生物炭增加了土壤中Cu和Zn的含量,但对黑麦草吸收土壤环境中的Cu和Zn有显著的抑制作用,增强了黑麦草对Pb和As的吸收。施用污泥生物炭增强了黑麦草吸收的Cu和Zn从地下根系向茎叶部分转移; Ni的富集仅发生在根系部分,高比例施用有增加根系部分Ni富集的趋势;黑麦草Pb和As主要富集在地下根部。施用污泥生物炭显著降低了土壤活性态Pb、Cd、As含量,增加了Cu、Zn、Ni活性态含量。土壤全量重金属含量随污泥生物炭用量的增加而逐渐提高,但其依然显著低于农用地土壤污染风险筛选值。由此可知,污泥生物炭一次性施用于砂姜黑土,控制其添加量在5%—15%范围,并不会造成土壤污染,同时可抑制黑麦草对主要重金属元素的吸收。更多还原

【Abstract】 In order to investigate the effect of sludge biochar application on heavy metal enrichment in soil and crop, Shajiang black soil was used as the study object, and a ryegrass potting experiment was set up with no sludge biochar application as the control(CK), and the addition of sludge biochar mass fractions of 0%(C0), 5%(C5), 10%(C10), 15%(C15), and 20%(C20) was used to analyze the change characteristics of heavy metal enrichment in the soil-ryegrass system. The results showed that the application of sludge biochar in Shajiang black soil increased the content of Cu and Zn in the soil, and significantly inhibited the uptake of Cu and Zn from the soil environment by ryegrass, while enhanced the uptake of Pb and As by ryegrass. The application of sludge biochar enhanced the transfer of Cu and Zn absorbed by ryegrass from the underground root to the stem and leaf parts, the enrichment of Ni occurred only in the root part, and the high rate of application had a tendency to increase the enrichment of Ni in the root part, and the ryegrass Cu, Pb, and As were mainly enriched in the underground root part, whereas Zn was mainly enriched in the above-ground stem and leaf parts. The application of sludge biochar significantly reduced the content of Pb, Cd and As in the active state of soil, and increased the content of Cu, Zn and Ni in the active state. The content of total heavy metals in the soil increased gradually with the increase of sludge biochar application ration, but it was still significantly lower than the screening value of the risk of soil pollution in agricultural land, and the application of sludge biochar did not cause heavy metal pollution in the soil. The application of sludge biochar to Shajiang black soil at one time, controlling its addition in the range of 5%-15%, did not cause soil pollution, and at the same time, it could inhibit the uptake of major heavy metal elements by ryegrass.更多还原