几种修复措施对Cd淋失及土壤剖面运移影响
Cd Runoff Load and Soil Profile Movement After Implementation of Some Typical Contaminated Agricultural Soil Remediation Strategies
查看参考文献26篇
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文摘
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采集典型Cd超标稻田土壤开展室外盆栽实验,选取石灰、 生物炭、 苎麻、 苎麻+有机酸EDTA添加强化富集植物等当前具有大田推广潜力的重金属超标土壤修复措施为研究对象,分析降雨、 土壤双重酸性环境不同修复措施下土壤剖面有效态Cd含量变化及其径流流失特征. 结果表明,生物炭(2%质量分数添加量)相比其他处理可显著提高土壤pH,苎麻添加EDTA则明显降低了土壤pH. 同次降雨事件中,苎麻处理所产生的径流水样中水溶态Cd质量浓度显著高于水稻降雨排水,水稻生物炭添加处理径流水Cd质量浓度明显低于石灰添加及其他各处理,苎麻添加EDTA后径流水Cd质量浓度比苎麻显著升高,石灰处理(0.3%质量分数添加量)对土壤pH、 径流水Cd质量浓度影响不明显. 实验周期内,径流水Cd的质量浓度呈现春季高于夏季的特征. 生物炭添加可显著降低0~20 cm土层有效态Cd含量且具一定持续效应,EDTA添加则显著提高了0~20 cm土层有效态Cd的含量,而添加一段时间后含量则明显降低,但20~40 cm土层有效态Cd含量则略高于其他处理,具有一定的次表层土壤Cd活化效应. 综上,生物炭等碱性固化材料添加修复措施可降低Cd污染土壤对地表受纳水体、 土壤剖面下移的污染风险,而有机酸强化植物修复技术对地表水、 深层土壤Cd污染风险较大,因此有机酸强化植物修复措施在大田推广时应充分考虑重金属的二次污染风险. |
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其他语种文摘
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Owing to the strong ability to immobilize and hyperaccumulate some toxic heavy metals in contaminated soils, the biochar, lime and such as hyperaccumulator ramie received increasing interests from crops and environment safety in recent years. Outdoor pot experiment was conducted to compare the impacts of lime and biochar addition in paddy rice treatment, hyperaccumulator ramie and ramie combined with EDTA of plant Phytoremediation methods on soil available Cd dynamics in rainfall runoff and the mobility along soil profile, under both natural acid precipitation and acid soil conditions. The results showed that, biochar addition at a 2% mass ratio application amount significantly increased soil pH, while ramie with EDTA application obviously decreased soil pH compared to ramie monoculture. Within the same rainfall events, water soluble Cd concentration in surface runoff of ramie treatments was significantly higher than those of waterlogged rice treatments, and Cd concentration in runoff was obviously increased after EDTA addition, whereas lime at a 0.3% mass ratio application amount as additive had no obvious impact on soil pH and Cd speciation change, which may be due to the low application amount. During the whole experimental period, water soluble Cd concentration of rainfall runoff in spring was higher than that in summer, showing the same seasonal characteristics in all treatments. Biochar addition could significantly decrease available Cd content in 0-20 cm soil layer and with certain preferable persistency effects, whereas EDTA addition treatment obviously increased available Cd of 0-20 cm soil layer compared to other treatments, and obvious Cd element activation phenomenon in 20-40 cm soil layer was observed after EDTA addition. In conclusion, lime and biochar as environmental and friendly alkaline Cd immobilization materials showed lower environment risk to surface and ground receiving water, but attention should be paid to phytoremediation enhanced with EDTA or other organic acid before promotion and field application for heavy metals removal from contaminated soils. |
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来源
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环境科学
,2016,37(2):734-739 【核心库】
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DOI
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10.13227/j.hjkx.2016.02.044
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关键词
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Cd超标
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稻田
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土壤
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修复措施
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径流流失
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地址
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1.
湖南农业大学资源环境学院, 长沙, 410128
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中国科学院亚热带农业生态研究所, 中国科学院亚热带农业生态过程重点实验室, 长沙, 410125
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中国科学院生态环境研究中心, 北京, 100085
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0250-3301 |
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学科
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环境科学基础理论;环境污染及其防治 |
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基金
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国家自然科学基金项目
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湖南农业大学杨仁斌教授环境科学基金项目
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文献收藏号
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CSCD:5627408
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参考文献 共
26
共2页
|
|
1.
顾继光. 土壤重金属污染的治理途径及其研究进展.
应用基础与工程科学学报,2003,11(2):143-151
|
被引
117
次
|
|
|
|
|
2.
张小敏. 中国农田土壤重金属富集状况及其空间分布研究.
环境科学,2014,35(2):692-703
|
被引
154
次
|
|
|
|
|
3.
郭朝晖. 湘江中下游农田土壤和蔬菜的重金属污染.
地理学报,2008,63(1):3-11
|
被引
100
次
|
|
|
|
|
4.
刘春早. 湘江流域土壤重金属污染及其生态环境风险评价.
环境科学,2012,33(1):260-265
|
被引
85
次
|
|
|
|
|
5.
Zhang Z. Surface water quality and its control in a river with intensive human impacts-a case study of the Xiangjiang River, China.
Journal of Environmental Management,2010,91(12):2483-2490
|
被引
12
次
|
|
|
|
|
6.
章强. 中国主要水域抗生素污染现状及其生态环境效应研究进展.
环境化学,2014,33(7):1075-1083
|
被引
83
次
|
|
|
|
|
7.
朱永官. 珠江三角洲地区土壤重金属污染控制与修复研究的若干思考.
环境科学学报,2005,25(12):1575-1579
|
被引
41
次
|
|
|
|
|
8.
黄益宗. 重金属污染土壤修复技术及其修复实践.
农业环境科学学报,2013,32(3):409-417
|
被引
225
次
|
|
|
|
|
9.
Kumpiene J. Stabilization of As, Cr, Cu, Pb and Zn in soil using amendments-a review.
Waste Management,2008,28(1):215-225
|
被引
216
次
|
|
|
|
|
10.
张晓熹. 石灰对重金属污染土壤上镉形态及芥菜镉吸收的影响.
福建农业学报,2003,18(3):151-154
|
被引
14
次
|
|
|
|
|
11.
Houben D. Mobility, bioavailability and pH-dependent leaching of cadmium, zinc and lead in a contaminated soil amended with biochar.
Chemosphere,2013,92(11):1450-1457
|
被引
67
次
|
|
|
|
|
12.
郭文娟. 土壤重金属钝化修复剂生物炭对镉的吸附特性研究.
环境科学,2013,34(9):3716-3721
|
被引
79
次
|
|
|
|
|
13.
赵中秋. 镉在土壤-植物系统中的迁移转化及其影响因素.
生态环境,2005,14(2):282-286
|
被引
97
次
|
|
|
|
|
14.
陈莉娜. 淹水还原作用对红壤镉生物有效性的影响.
农业环境科学学报,2009,28(11):2333-2337
|
被引
13
次
|
|
|
|
|
15.
刘坤. EDTA及低分子量有机酸对土壤Cd活性的影响研究.
农业环境科学学报,2008,27(3):894-897
|
被引
11
次
|
|
|
|
|
16.
夏汉平. 鼎湖山3种不同林型下的土壤酸度和养分含量差异及其季节动态变化特性.
生态学报,1997,17(6):645-653
|
被引
59
次
|
|
|
|
|
17.
刘艳. 鼎湖山针阔叶混交林土壤酸度与土壤养分的季节动态.
生态环境,2005,14(1):81-85
|
被引
14
次
|
|
|
|
|
18.
陆泗进. 湖南省某地农田土壤重金属生态风险评价研究.
环境科学与技术,2014,37(12):100-105
|
被引
7
次
|
|
|
|
|
19.
刘孝利. 生物炭与石灰添加对稻田土壤重金属面源负荷影响.
水利学报,2014,45(6):682-690
|
被引
8
次
|
|
|
|
|
20.
Lucchini P. Does biochar application alter heavy metal dynamics in agricultural soil?.
Agriculture, Ecosystems & Environment,2014,184:149-157
|
被引
9
次
|
|
|
|
|
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