| 土壤pH和Cd全量对伴矿景天修复效率的影响 |
| |
| 引用本文： | 曹雪莹,谭长银,谢雨呈,代兵,朱上游,王一志.土壤pH和Cd全量对伴矿景天修复效率的影响[J].环境科学研究,2019,32(9):1604-1612. |
| |
| 作者姓名： | 曹雪莹 谭长银 谢雨呈 代兵 朱上游 王一志 |
| |
| 作者单位： | 湖南师范大学资源与环境科学学院,湖南长沙410081;湖南师范大学,环境重金属污染机理及生态修复重点实验室,湖南长沙410081;湖南师范大学资源与环境科学学院,湖南长沙410081;湖南师范大学,环境重金属污染机理及生态修复重点实验室,湖南长沙410081;湖南师范大学资源与环境科学学院,湖南长沙410081;湖南师范大学,环境重金属污染机理及生态修复重点实验室,湖南长沙410081;湖南师范大学资源与环境科学学院,湖南长沙410081;湖南师范大学,环境重金属污染机理及生态修复重点实验室,湖南长沙410081;湖南师范大学资源与环境科学学院,湖南长沙410081;湖南师范大学,环境重金属污染机理及生态修复重点实验室,湖南长沙410081;湖南师范大学资源与环境科学学院,湖南长沙410081;湖南师范大学,环境重金属污染机理及生态修复重点实验室,湖南长沙410081 |
| |
| 基金项目： | 湖南省科技计划重点项目（No.2017NK2141）；湖南省国内一流培育学科项目 |
| |
| 摘 要： | 修复效率是影响植物修复周期和技术推广的主要因素之一.采用不同pH和不同程度Cd污染农田土壤进行盆栽试验，其中，重度Cd污染土壤（简称"SKS处理"）中w（Cd）（Cd全量）高于GB 15618-2018《土壤环境质量农用地土壤污染风险管控标准（试行）》中的风险管控值，中度Cd污染土壤（通过人为调节并稳定其pH为3.97、4.97、6.03、6.90和7.93）中w（Cd）介于GB 15618-2018风险筛选值和管控值之间，轻度Cd污染土壤（简称"YH处理"）中w（Cd）略高于GB 15618-2018风险筛选值；比较修复前后不同pH和不同程度Cd污染对土壤Cd有效性、形态分配及w（Cd）的影响，并结合PCA（主成分分析）和Pearson相关性分析等方法深入研究影响植物修复效率的主控因素.结果表明:①与修复前相比，不同pH处理修复后土壤中w（有效态Cd）、w（弱酸提取态Cd）、w（可还原态Cd）、w（可氧化态Cd）和w（Cd）的减少量均随pH的降低而增加，土壤pH ≤ 6.0时，伴矿景天修复效率显著高于土壤pH>6.0的处理（P <0.05）.②修复后，轻度Cd污染土壤中w（Cd）降至GB 15618-2018风险筛选值以下，中度Cd污染土壤pH ≤ 6.0的处理中w（Cd）降至0.60 mg/kg左右，而pH>6.0的处理中w（Cd）仍高于1.00 mg/kg.③重度Cd污染土壤中w（有效态Cd）最高，其伴矿景天生物量与轻度Cd污染土壤处理无显著差异，w（Cd）达681.5 mg/kg，但修复效率显著低于其他处理（P <0.05）.综合PCA和Pearson相关性分析发现，影响伴矿景天修复效率的主控因素除土壤pH、Cd有效性和伴矿景天生物量外，伴矿景天的BCF（富集系数）对修复效率也具有重要作用.因此，伴矿景天更适用于弱酸性、中度Cd污染和轻度Cd污染土壤；而对碱性或重度Cd污染土壤进行植物修复时，可适当延长修复周期或联合修复以提高其修复效率.
|
| 关 键 词： | Cd 伴矿景天 植物修复 污染程度 有效性 |
| 收稿时间： | 2019/2/19 0:00:00 |
| 修稿时间： | 2019/4/30 0:00:00 |
Effect of Soil pH and Total Cadmium Concentration of Soil on the Remediation Efficiency of Sedum plumbizincicola |
| |
| CAO Xueying,TAN Changyin,XIE Yucheng,DAI Bing,ZHU Shangyou and WANG Yizhi.Effect of Soil pH and Total Cadmium Concentration of Soil on the Remediation Efficiency of Sedum plumbizincicola[J].Research of Environmental Sciences,2019,32(9):1604-1612. |
| |
| Authors: | CAO Xueying TAN Changyin XIE Yucheng DAI Bing ZHU Shangyou and WANG Yizhi |
| |
| Affiliation: | 1.College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China2.Key Laboratory of Environmental Heavy Metal Pollution Mechanism and Ecology Remediation, Hunan Normal University, Changsha 410081, China |
| |
| Abstract: | Remediation efficiency is one of the main factors affecting the remediation cycle and promotion of remediation technology. Pot experiments were carried out with paddy soil with different pH and different Cd concentration. The w(Cd) of heavily contaminated soil (SKS) was much higher than the risk intervention value in Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (GB 15618-2018). The w(Cd) of moderately contaminated soil (pH were adjusted and stabilized to about 3.97, 4.97, 6.03, 6.90 and 7.93, respectively) was between the risk screening value and intervention value, and the w(Cd) of lightly contaminated soil (YH) was slightly higher than the risk screening value. The soil Cd availability, speciation distribution and w(Cd) before and after treatments at different pH and different Cd concentration were compared, and the main factors affecting the remediation efficiency were further studied by PCA and Pearson correlation analysis. The results showed that:(1) Compared with the original soil, the decrement of the w(available Cd), w(acid soluble Cd), w(reducible Cd), w(oxidizable Cd) and the w(Cd) of the treated soil with different pH increased with decrease of pH. When pH ≤ 6.0, the remediation efficiency was significantly improved compared with the treatments of pH>6.0 (P < 0.05). (2) After remediation, the w(Cd) of YH decreased to below the risk screening value. The w(Cd) with soil pH ≤ 6.0 of moderately contaminated soil was reduced to 0.60 mg/kg, while the w(Cd) with soil pH>6.0 was still higher than 1.00 mg/kg. (3) The soil of SKS treatment had the highest w(available Cd), and there was no significant difference in biomass between SKS and YH, the w(Cd) of Sedum plumbizincicola could reach 681.5 mg/kg, but the remediation efficiency was significantly lower than other treatments (P <0.05). Taking into account the results of the PCA and Pearson correlation analysis, in addition to soil pH, Cd availability and the biomass, the bio-concentration factor (BCF) of S. plumbizincicola also played an important role in the efficiency of remediation. Therefore, phytoremediation with S. plumbizincicola is more suitable for the moderately and lightly Cd-contaminated and acid soils, while for phytoremediation of alkaline or heavily contaminated soils, the remediation cycle can be extended or the efficiency could be improved by combining other remediation techniques. |
| |
| Keywords: | cadmium Sedum plumbizincicola phytoremediation degree of contamination availability |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《环境科学研究》浏览原始摘要信息 |
|
点击此处可从《环境科学研究》下载全文 |
|
