Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden of Chinese Academy of Sciences, Wuhan, 430074, China.
Soils and Water Department, Faculty of Agriculture, Benha University, Moshtohor, Toukh, Kalyoubia, 13736, Egypt.
Environ Sci Pollut Res Int. 2019 Jul;26(21):21849-21857. doi: 10.1007/s11356-019-05501-7. Epub 2019 May 27.
Incorporation of organic amendments is one of the most eco-friendly and economic strategies for the restoration of contaminated soils through diminishing mobility and bioavailability of heavy metals in these soils. This study was carried out under field conditions during the summer season of 2017 on a clay loam soil naturally polluted with Cd (7.61 mg kg) due to successive irrigations with wastewater. The main goal of this study was to evaluate the influence of sugarcane bagasse-derived biochar (SBDB) at different rates on fractionation of Cd in soil and its implications on the growth of soybean and concentrations of Cd within the different plant parts. Incorporation of SBDB into the chosen contaminated soil caused noticeable changes in soil pH, electrical conductivity and organic matter, especially with increasing the rate of application. Immobilization of Cd in the used soil was highly influenced by soil properties. According to the sequential extraction procedure, application of SBDB had an efficient role in reducing the soluble/exchangeable fraction. Moreover, it declined both the reducible and oxidizable forms of Cd. The dry weight of soybean organs (roots, seeds, and straw) improved significantly with SBDB additions. The highest dry weight values of straw and seeds for soybean plants were recorded when the soil was treated with SBDB at rates of 15 and 30 t ha. Concentrations of Cd in straw and seeds of soybean were markedly affected by its availability in the soil. They decreased from 2.77, 0.96, and 0.62 mg kg at the control treatment (CK) to 1.75, 0.47, and 0.20 mg kg at B4 treatment (30 t SBDB) ha in roots, straw, and seeds of soybean, respectively. In conclusion, the use of SBDB showed high efficiency in the amelioration of Cd-polluted soils and in decreasing Cd toxicity on soybean plants.
在污染土壤中，掺入有机改良剂是一种最环保和经济的策略，通过降低土壤中重金属的迁移性和生物有效性来修复土壤。本研究于 2017 年夏季在田间条件下进行，研究对象是一种受 Cd 污染的壤土（由于连续使用污水灌溉，Cd 含量为 7.61mg/kg）。本研究的主要目的是评估不同用量的甘蔗渣生物炭（SBDB）对土壤中 Cd 形态的影响，及其对大豆生长和不同植物部位 Cd 浓度的影响。将 SBDB 掺入受污染土壤中，会显著改变土壤 pH 值、电导率和有机质，特别是随着施用量的增加。SBDB 对土壤中 Cd 的固定作用受土壤性质的影响较大。根据连续提取程序，SBDB 的应用对降低可溶/可交换态 Cd 具有显著效果。此外，它还降低了可还原态和可氧化态 Cd 的含量。添加 SBDB 后，大豆各器官（根、种子和秸秆）的干重显著增加。当土壤用 SBDB 处理时，SBDB 用量为 15 和 30 t/ha，大豆秸秆和种子的干重达到最高。大豆植株秸秆和种子中的 Cd 浓度受其在土壤中的有效性显著影响。与对照处理（CK）相比，它们在根、秸秆和种子中的浓度分别从 2.77、0.96 和 0.62mg/kg 降低到 1.75、0.47 和 0.20mg/kg。在 B4 处理（30 t SBDB/ha）。总之，SBDB 的使用在改良 Cd 污染土壤和降低 Cd 对大豆植物的毒性方面表现出很高的效率。
