| 潘雨齐,黄仁志,雷鸣,颜新培,龚昕,蒋诗梦,贾超华.镉在桑树体内的迁移与分布特征研究[J].农业环境科学学报,2016,35(8):1480-1487. |
| 镉在桑树体内的迁移与分布特征研究 |
| Transportation and distribution of Cd in different varieties of mulberry(Moms alba L.) |
| 投稿时间：2015-12-29 |
| DOI：10.11654/jaes.2015-1725 |
| 中文关键词: 土壤污染 镉 桑树 品种 种植密度 |
| 英文关键词: soil contamination cadmium mulberry variety planting density |
| 基金项目:湖南省教育厅重点项目（14A068）；湖南省科技计划项目（2013SK5036）；湖南省环境保护厅科技计划项目（湘财建指[2013]229号） |
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| 中文摘要: |
| 为研究品种和种植密度对桑树吸收土壤镉及在其体内运转规律的影响，选择湖南邵阳洞口和岳阳临湘两地的重金属污染区为研究区，按照不同种植密度（15 000、30 000、45 000株·hm-2）种植三个品种桑树（粤桑11号、农桑14号和强桑1号），并对桑树植株中镉的含量与分布进行分析。结果表明：两个污染区的土壤受到镉的重度污染，其中岳阳临湘污染区土壤中重金属的潜在风险高于邵阳洞口污染区；在试验设置的种植密度范围内，桑树地上部（茎、枝、叶）镉含量随着种植密度的增加而升高，高密度的种植方式有利于提高桑树对镉污染土壤的修复效率；在整个桑树植株中，根部镉的平均含量约占总量的40%，茎部和枝部镉的平均含量约占44%，叶片镉的平均含量约占16%；土壤Cd污染程度的增加提升了桑树根向上运输Cd的能力，桑树在洞口试验区根-茎、根-枝、根-叶的转运系数分别为0.37～0.46、0.38～0.51、0.37～0.49，临湘试验区分别为0.50～0.83、0.42～0.61、0.54～0.64。研究进一步表明，桑树可种植于重金属污染的土壤。 |
| 英文摘要: |
| Mulberry(Moms alba L.) has potential to be used as phytoremediating plant. In this study, three varieties of mulberry(called Yuesang 11, Nongsang 14, and Qiangsang 1) were planted at three planting densities in two heavy metal-contaminated fields named Dongkou in Shaoyang City and Linxiang in Yueyang City in Hunan Province, respectively. The transport, accumulation and distribution of cadmium in the plants were studied. Results showed that both soils were contaminated by heavy metals, especially by Cd. The potential risks of heavy metals in Linxiang soil were higher than those in Dongkou soil. The content of Cd in the aboveground(stem, branch and leaf) of mulberry increased with increasing planting density, implying that high density planting method improved the remediation efficiency of Cd contaminated soil. In the whole mulberry plant, the average Cd content in mulberry roots accounted for about 40% of the total, Cd in stems and branches contributed to about 44%, and Cd in leaves only about 16%. Increased soil Cd pollution promoted mulberry roots to transport Cd. The translocation factors of root-stem, root-branch, and root-leaf of mulberry in Dongkou soil were 0.37~0.46, 0.38~0.51 and 0.37~0.49, while 0.50~0.83, 0.42~0.61, 0.54~0.64 in Linxiang, respectively. Therefore, mulberry can be planted for remediating heavy metals contaminated soils. |
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