| 盐渍化条件下污灌区土壤重金属的释放特征 |
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| 引用本文： | 郑顺安,韩允垒,倪润祥,周玮,黄宏坤,郑向群.盐渍化条件下污灌区土壤重金属的释放特征[J].环境科学学报,2018,38(8):3286-3293. |
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| 作者姓名： | 郑顺安 韩允垒 倪润祥 周玮 黄宏坤 郑向群 |
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| 作者单位： | 农业部农业生态与资源保护总站;农业部资源循环利用技术与模式重点实验室;农业部环境保护科研监测所;中国农学会 |
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| 基金项目： | 国家自然科学基金项目（No.41203084，41371463）；国家水体污染控制与治理科技重大专项（No.2015zx07103-007） |
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| 摘 要： | 以受盐渍化和重金属双重胁迫的天津污灌区土壤为研究对象,通过径流实验和淋溶实验,探讨盐渍化土壤重金属的释放特征及对水质安全的影响.研究的盐分种类为污灌区土壤盐渍化进程中的主要盐分Na Cl,设置的盐度梯度为7个,添加质量分数为0(CK)~5%,污染土壤中Cd、Pb和Hg含量分别为2.21、234.1和0.601 mg·kg~(-1).结果表明,(1)不同盐度处理下产流所需时间为(51'25″±15″),盐度对径流产流时间影响不显著;(2)随着Na Cl盐度梯度的提高,土壤径流和淋溶液中Cd、Pb和Hg的累计释放量均显著上升.Cd累计释放量从CK的53.40μg·kg~(-1)(径流)和55.63μg·kg~(-1)(淋溶)分别提高到5%Na Cl盐度处理的122.56μg·kg~(-1)(径流)和135.79μg·kg~(-1)(淋溶),Pb的累计释放量从CK的168.30μg·kg~(-1)(径流)和94.44μg·kg~(-1)(淋溶)分别提高到5%Na Cl盐度处理的340.68μg·kg~(-1)(径流)和201.93μg·kg~(-1)(淋溶),Hg的累计释放量从CK的39.66μg·kg~(-1)(径流)和9.60μg·kg~(-1)(淋溶)分别提高到5%Na Cl处理的89.37μg·kg~(-1)(径流)和11.97μg·kg~(-1)(淋溶).同时,径流及淋溶液中可溶态重金属含量显著上升,颗粒态含量有所下降,其所占比例也显著下降.Cl-含量与重金属累计释放量之间关系可以用线性或对数模型拟合.(3)高盐度处理下径流和淋出液中Cd浓度超过地下水水质Ⅲ类标准,对环境及地下水存在一定威胁;径流和淋溶前期Pb浓度超过Ⅲ类标准;径流和淋溶过程中Hg浓度均超过Ⅲ类标准,风险较高.本研究结果表明高强度降雨强度下污染农田土壤重金属释放风险不可忽视.
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| 关 键 词： | 盐渍化 土壤 重金属 径流 淋溶 |
| 收稿时间： | 2018/2/24 0:00:00 |
| 修稿时间： | 2018/3/26 0:00:00 |
Release of heavy metals from soils under the different salinity levels in the wastewater-irrigated area of Tianjin City |
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| ZHENG Shunan,HAN Yunlei,NI Runxiang,ZHOU Wei,HUANG Hongkun and ZHENG Xiangqun.Release of heavy metals from soils under the different salinity levels in the wastewater-irrigated area of Tianjin City[J].Acta Scientiae Circumstantiae,2018,38(8):3286-3293. |
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| Authors: | ZHENG Shunan HAN Yunlei NI Runxiang ZHOU Wei HUANG Hongkun and ZHENG Xiangqun |
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| Institution: | 1. Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125;2. Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100125;3. Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191,Chinese Association of Agricultural Science Society, Beijing 100125,1. Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125;2. Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100125,1. Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125;2. Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100125,1. Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125;2. Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100125 and Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191 |
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| Abstract: | |
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| Keywords: | salinization soil heavy metal runoff leaching |
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