Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China.
Int J Phytoremediation. 2023;25(3):339-349. doi: 10.1080/15226514.2022.2084500. Epub 2022 Jun 10.
Intercropping a Cd-accumulator with economically valuable crops is common in slightly or moderately Cd-polluted farmland soils. A field experiment was conducted to evaluate the effects of water-soluble chitosan (WSC) on the growth and Cd uptake of the Cd-accumulator and soybean () during a co-cultivation in Cd-contaminated agricultural soil (WSC, 0 and 10 g·m). The results indicated that soybean yields were highest in response to the intercropping and WSC treatment. The results from the field trials generally showed that intercropping and WSC treatments significantly decreased Cd concentrations in inedible parts of soybean by 42.9-72.1% (except for stems), in the meantime, increased 95.8%-334.6% in shoot and root tissues of compared with the control ( < 0.05). The data revealed that Cd uptake was highest for during the intercropping and WSC treatment. The application of WSC in the intercropping system significantly increased the uptake of Cd by , but not by soybean. The findings of this study suggest that combining an intercropping system with a WSC treatment may be better for remediating Cd-contaminated soils than other methods involving the growth of a single hyperaccumulator.
在轻度或中度镉污染农田土壤中，将镉积累植物与经济价值高的作物间作是很常见的。本研究进行了田间试验，以评估水溶性壳聚糖（WSC）对镉积累植物和大豆（）在镉污染农业土壤（WSC，0 和 10 g·m）共培养中的生长和镉吸收的影响。结果表明，间作和 WSC 处理对大豆产量的提高最为显著。田间试验的结果普遍表明，与对照相比（<0.05），间作和 WSC 处理可使大豆不可食用部分的镉浓度分别降低 42.9-72.1%（除茎外），同时地上部和根部组织的镉含量分别增加 95.8%-334.6%。数据显示，在间作和 WSC 处理下，大豆对镉的吸收最高。WSC 在间作系统中的应用显著增加了镉的吸收，但对大豆没有影响。本研究结果表明，与其他涉及单一超积累植物生长的方法相比，将间作系统与 WSC 处理相结合可能更有利于修复镉污染土壤。
