| 黄河三角洲盐地碱蓬对镉的吸收富集特征 |
| Accumulation of Cadmium in Suaeda Salsa in the Yellow River Delta |
| 投稿时间：2021-12-17 修订日期：2022-01-29 |
| DOI：10.15928/j.1674-3075.202112170413 |
| 中文关键词:重金属污染 富集系数 碱蓬 镉输入；黄河三角洲 |
| 英文关键词:heavy metal pollution enrichment coefficient Suaeda salsa Cd input Yellow River delta |
| 基金项目:东省自然科学基金面上项目（ZR2021MD003、ZR2021MD045、ZR2021MD105）资助 |
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| 中文摘要: |
| 为明确调水调沙背景下碱蓬对镉（Cd）污染的吸收富集特征，本研究以黄河三角洲盐地主要潜在生态风险因子Cd为切入点，温室栽培采集于该区的碱蓬种子，设置了0、1.0、1.5、2.0、3.0、4.0、5.0 mg/kg 等7个Cd输入量处理组，分析了Cd输入对碱蓬生物量、Cd含量、富集系数及转移系数的影响。结果表明：少量Cd输入时（≤4.0 mg/kg）碱蓬生物量高于对照，并在2.0 mg/kg处理时总生物量、茎和叶生物量取得最大值，而过高的Cd输入处理（>5.0 mg/kg）生物量则低于对照；随着Cd输入的增加，碱蓬根、茎及叶中Cd含量呈现增加趋势，而Cd富集系数则呈现先增高后降低的变化趋势，且在Cd输入量为2.0 mg/kg时，富集系数取得最大值（42.67、4.82和6.18）；整体上碱蓬根是富集Cd主要部位，但在低水平Cd输入（0.0 mg/kg和1.0 mg/kg）时，茎和叶部转运系数大于高水平Cd输入，表现出较强富集作用。以上结果表明碱蓬能有效富集土壤中的Cd元素，且在一定范围内碱蓬的富集能力随着Cd输入的增加而增加，但是过高的Cd浓度输入会抑制碱蓬的Cd富集能力。 |
| 英文摘要: |
| Heavy metal pollution in the Yellow River delta has increased due to human activities and has been exacerbated by implementation of water and sediment regulations that further increased heavy metal inputs. Studies on heavy metal absorption by vegetation in the Yellow River delta provide data to support effective control and treatment of heavy metal pollution. For this study, we selected Suaeda salsa and Cd, the primary potential ecological risk factor. We analyzed the effect of different Cd levels on S. salsa biomass, Cd content and the enrichment index using greenhouse pot culture, and then discussed Cd accumulation in S. salsa due to Cd contamination in the Yellow River delta. The study provides scientific data to support the prevention, control, and management of soil heavy metal pollution in the coastal wetland. From May to July 11 of 2019, greenhouse pot culture of S. salsa was carried out at seven treatments (C0-C6) with Cd concentrations of 0, 1.0, 1.5, 2.0, 3.0, 4.0 and 5.0 mg/kg, respectively. Soil for the experiment was collected from a S. salsa wetland in the Yellow River delta. After the experiment, the biomass of S. salsa root, stem and leaf and the content of Cd in each part of S. salsa and in the soil were determined. Total biomass of S. salsa increased initially and then decreased as soil Cd concentration increased. Appropriate Cd input (≤4.0 mg/kg) triggered the detoxification mechanism of S. salsa and consequently promoted growth, and total biomass (702.84 g/m2), stem (333.55 g/m2) and leaf (326.53 g/m2) biomass peaked in the 2.0 mg/kg treatment. However, higher Cd concentrations inhibited growth and the total biomass of S. salsa was the lowest (492.26 g/m2) in treatment C6. Soil Cd concentration significantly affected Cd content of the root, stem and leaf of S. salsa. The enrichment factor for root, stem and leaf increased initially and then decreased with increasing Cd soil content, reaching the maximum values (42.67, 4.82, 6.18) in treatment C3. Roots were most enriched in Cd, but at low levels (C0 and C1), the transfer coefficients for stem and leaf were higher than at high levels and displayed strong enrichment. In conclusion, S. salsa effectively accumulates Cd from sediment and reduces Cd pollution. However, while the enrichment capacity of S. salsa increases with increased Cd levels, too much Cd inhibits Cd accumulation. |
| 宋红丽,金祥,王立志,焦伟,吴元芝,郁万妮,刘前进,严岩.2023.黄河三角洲盐地碱蓬对镉的吸收富集特征[J].水生态学杂志,44(5):100-106. |
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