摘要
为了研究组配改良剂（石灰石＋海泡石，Ls）对于重金属Ph、cd、cu和zn复合污染稻田的修复效果，在湘南某矿区附近稻田中进行了组配改良剂的田间试验。结果表明：施用0～1．8kgm。的组配改良剂Ls使土壤pH和CEC显著增加，使土壤中Pb、cd、cu和zn交换态含量显著降低。土壤Pb、cd、cu和zn交换态含量的降低是pH升高，土壤胶体的CEC增加及土壤吸附能力增强的共同作用。施用组配改良剂Ls显著降低了3个水稻品种（黄华占、丰优9号、Ⅱ优93）糙米中Pb、cd和cu的累积量，最大降幅分别为55．8％、66．9％、37．4％，而对糙米中zn的含量没有明显影响。当Ls施用量为1．8kgm。时，能使丰优9号糙米中cd含量（0．195mgkg-1）达到国家食品中污染物限量标准（0．20mgkg。）以下。土壤中交换态Pb、cd和cu含量的降低是糙米中重金属累积量减少的原因。土壤交换态Pb、cd和cu含量的对数值（1nC交换态）与其糙米中含量（1nC#＊）的对数值之间存在显著的线性相关关系。
In order to study the effects of applying combined amendment （prepared by mixing limestone and sepiolite at a mass ratio of 2： 1, LS） on remediation results in heavy metal contaminated paddy soils, a field experiment was conduc- ted in a paddy soil near a mining area in southern Hunan, China. The experiment results indicated that applying 0 - 1.8 kg m-2 of LS significantly increased soil pH and CEC,and decreased exchangeable contents of soil Pb, Cd, Cu and Zn. With increasing in applying amount of LS,the remediation results became more notable. The reduction of exchangeable Pb,Cd, Cu and Zn was an outcome of rising soil pH, CEC and soil colloid adsorption capacity due to addition of limestone and se- piolite. Meanwhile, applying LS resulted obviously in reducing contents of Pb,Cd and Cu in brown rice of the three tested rice varieties （ Hanghuazhan, Fengyou 9, and II You 93 in Chinese system） , and the maximum reduction of Pb, Cd and Cu contents in brown rice were 55.8% ,66.9% , and 37.4% , respectively. However, applying LS had no significant effects on Zn contents in brown rice. As a result of applying 1.8 kg m 2 of LS to the paddy soil, the Cd content in brown rice of Fengyou 9 could be decreased to 0. 195 mg kg-~ ,lower than the limits stipulated in the National Standard GB 2762-2012, Maximum Content of Contaminants in Food （0.20 mg kg-~ ）. The reduction of Pb,Cd and Cu accumulation in brown rice was due to LS reduced exchangeable contents of soil heavy metals,and there were significantly positive linear correlations between the exchangeable contents of Pb, Cd, Cu in soil and contents of Pb, Cd, Cu in brown rice in natural logarithm.
出处
《土壤学报》
CAS
CSCD
北大核心
2014年第3期555-563,共9页
Acta Pedologica Sinica
基金
国家环保部公益性科研专项(No.201009047)
国家自然科学基金项目(No.41201530)
湖南省科技计划项目(No.2013FJ3042)共同资助
关键词
修复
水稻
重金属
组配改良剂
石灰石
海泡石
Remediation
Rice
Heavy metal
Combined amendment
Limestone
Sepiolite
作者简介
周歆（1988-），女，湖南长沙人，硕士研究生，主要从事土壤重金属污染修复技术。E—mail：zhouxin916916@163．com
通讯作者，E-mail：liaobhl020@163.com
