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| Effects of intercropping modes of Zea mays L. and Solanum nigrum L. on plant growth and Cd enrichment characteristics |
| Received:June 08, 2020 |
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| KeyWord:Zea mays L.;Solanum nigrum L.;intercropping;growth;Cd accumulation |
| Author Name | Affiliation | E-mail | | YAN Ren-jun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HAN Lei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Ya-ping | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIN Da-song | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Ya-jun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XU Ying-ming | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Rui-gang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | 3761520835@sina.com |
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| Abstract: |
| In order to explore the appropriate intercropping restoration mode, a field plot experiment was conducted to investigate the changes in the biomass land equivalent ratio, Cd content, total Cd extraction, bioaccumulation coefficient(BCF), transfer coefficient(TF), pH, and available Cd content in the rhizosphere soil of Zea mays L. and the hyperaccumulator Solanum nigrum L. in seven planting modes, including a monoculture of Z. mays(CK1), monoculture of S. nigrum(CK2), wide-narrow row of Z. mays and single row of S. nigrum intercropped between wide rows(T1), wide-narrow row of Z. mays and double row of interlaced S. nigrum intercropped between wide rows (T2), intercropped equidistant single row of Z. mays and single row of S. nigrum(T3), intercropped equidistant single row of Z. mays and double row of interlaced S. nigrum(T4), and Z. mays and S. nigrum intercropped with four equal rows(T5). The results showed that the land equivalent ratio of the five intercropping modes was greater than 1. Compared with that of CK1, the T3 intercropping mode increased the yield of Z. mays by 15.6%, the T1, T4, and T5 intercropping modes decreased the yield of Z. mays by less than 10%, and the T2 intercropping mode decreased the yield of Z. mays by 16.8%. Compared with that of CK2, the five intercropping modes did not change the total biomass per plant of S. nigrum. The five intercropping modes did not significantly change the Cd content, BCF, and TF of Z. mays and S. nigrum, but significantly increased the total Cd extraction per unit area, and that under the T4 intercropping mode was the highest. In addition to the T5 treatment, the other four intercropping modes significantly reduced the pH of the rhizosphere soil of S. nigrum and Z. mays, increased the Cd content of the rhizosphere soil of S. nigrum, and decreased the Cd content of the rhizosphere soil of Z. mays. This indicated that the intercropping modes improved the growth of Z. mays and S. nigrum. The intercropping modes of T1, T3, T4, and T5 not only ensured the stable yield of Z. mays, but also significantly improved the efficiency of restoration and reached the purpose of repairing while producing, and the T4 intercropping mode was the most effective. In addition, the S. nigrum in the Shenyang area was not adaptable in Hunan Province, so it was suggested to choose local S. nigrum for intercropping restoration. |
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