Ministry of Agriculture Key Laboratory of Crop Water Use and Regulation, Institute of Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, 453002, China.
Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
Environ Sci Pollut Res Int. 2016 Dec;23(23):23638-23647. doi: 10.1007/s11356-016-7588-y. Epub 2016 Sep 11.
Steel slag has been widely used as amendment and silicon fertilizer to alleviate the mobility and bioavailability of heavy metals in soil. The objective of this study was to evaluate the influence of particle size, composition, and application rate of slag on metal immobilization in acidic soil, metals uptake by rice and rice growth. The results indicated that application of slag increased soil pH, plant-available silicon concentrations in soil, and decreased the bioavailability of metals compared with control treatment, whereas pulverous slag (S1) was more effective than granular slag (S2 and S3). The acid-extractable fraction of Cd in the spiked soil was significantly decreased with application of S1 at rates of 1 and 3 %, acid-extractable fractions of Cu and Zn were decreased when treated at 3 %. Use of S1 at both rates resulted in significantly lower Cd, Cu, and Zn concentrations in rice tissues than in controls by 82.6-92.9, 88.4-95.6, and 67.4-81.4 %, respectively. However, use of pulverous slag at 1 % significantly promotes rice growth, restricted rice growth when treated at 3 %. Thus, the results explained that reduced particle size and suitable application rate of slag could be beneficial to rice growth and metals stabilization.
钢渣已被广泛用作改良剂和硅肥，以缓解土壤中重金属的迁移性和生物可利用性。本研究旨在评估钢渣的粒径、组成和施用量对酸性土壤中金属固定、水稻吸收金属和水稻生长的影响。结果表明，与对照处理相比，施入钢渣增加了土壤 pH 值、土壤中有效硅浓度，降低了金属的生物有效性，而细粒钢渣（S1）比粒状钢渣（S2 和 S3）更有效。添加土壤中 Cd 的酸提取分数随 S1 的施用量为 1%和 3%而显著降低，Cu 和 Zn 的酸提取分数在 3%处理时降低。S1 在两个施用量下均导致水稻组织中 Cd、Cu 和 Zn 的浓度比对照分别降低了 82.6-92.9%、88.4-95.6%和 67.4-81.4%。然而，细粒钢渣在 1%的施用量下显著促进了水稻的生长，而在 3%的施用量下则限制了水稻的生长。因此，结果表明，减小粒径和适当的钢渣施用量有利于水稻生长和金属稳定。
