National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
Chemosphere. 2021 Aug;276:130223. doi: 10.1016/j.chemosphere.2021.130223. Epub 2021 Mar 13.
Intercropping technology is applied widely in crop cultivation to help remediate soil polluted with heavy metals. To investigate the feasibility and potential of intercropping hyperaccumulator plants with crops in cadmium (Cd)- and zinc (Zn)-contaminated soil, a pot experiment was conducted to examine plant growth and the contents of Cd and Zn in the soil following intercropping of wheat and Sedum plumbizincicola. Five treatments were examined: control (wheat monoculture: 36 seedlings per pot), and intercropping of wheat with different planting densities of S. plumbizincicola (3, 6, 9 and 15 seedlings per pot, respectively). Results showed a decrease in soil pH, and in soil and wheat contents of Cd and Zn with increasing planting density of S. plumbizincicola, while the removal rate of Cd and Zn increased. Meanwhile, excessive planting (15 seedlings per pot) inhibited wheat growth by 27.34% compared with the control, and overall, the optimal planting density was 9 seedlings per pot, resulting in effective remediation with only a moderate effect on wheat growth. These findings highlight the value of intercropping S. plumbizincicola with wheat as a means of improving remediation of soil contaminated with heavy metals (Cd and Zn).
间作技术广泛应用于作物种植中，以帮助修复重金属污染的土壤。为了研究超积累植物与作物在镉（Cd）和锌（Zn）污染土壤中的间作的可行性和潜力，进行了盆栽试验，以研究小麦和Sedum plumbizincicola 间作后植物生长和土壤中 Cd 和 Zn 的含量。考察了 5 种处理：对照（小麦单作：每盆 36 株）和不同种植密度的 S. plumbizincicola 与小麦间作（每盆 3、6、9 和 15 株，分别）。结果表明，随着 S. plumbizincicola 种植密度的增加，土壤 pH 值以及土壤和小麦中 Cd 和 Zn 的含量降低，而 Cd 和 Zn 的去除率增加。同时，过度种植（每盆 15 株）导致小麦生长抑制率比对照高 27.34%，总体而言，最佳种植密度为每盆 9 株，既能有效修复土壤，又能适度影响小麦生长。这些发现突出了将 S. plumbizincicola 与小麦间作作为改善重金属（Cd 和 Zn）污染土壤修复的价值。
