摘要
在酸性土壤中,石灰对重金属污染土壤有明显的钝化修复效果。通过土壤盆栽试验,以宜优673(籼稻)为供试作物,研究了添加石灰(消石灰,Ca(OH)2)对Cd-Pb复合污染土壤中Cd、Pb的有效性,以及Cd、Pb在土壤-水稻体系中转移与累积的影响,探讨了石灰降低水稻糙米Cd和Pb累积量的主要途径。结果表明,石灰提高了土壤的p H值,显著降低了土壤Cd和Pb的有效性和根表铁膜中Cd、Pb的质量比,对根系Cd质量比的影响不显著,但显著降低了成熟期根系Pb的质量比。石灰抑制了Cd从根向叶、从茎向叶的转移,抑制了Pb从茎和叶向糙米的转移,最终降低了Cd和Pb在糙米中的累积量。与Cd的累积相比,石灰抑制Pb在糙米中累积的效果更为显著。研究表明,石灰降低了土壤中Cd和Pb的有效量,抑制了Cd和Pb在水稻体内的转移,是降低水稻糙米Cd和Pb累积量的主要途径。
The present paper is to devote itself to the study of the effects of lime on the transfer of Cd and Pb in the soil-rice cultivation system and their accumulation in the rice grains＇ soil polluted by the heavy metals. As is known,in the acidic soil,caustic lime is entitled with an effective amendment function to immobilize heavy metal contaminants in the rice-growing soil system. Nevertheless,we have no clear idea as to the actual effects of the caustic lime on the translocation of heavy metals in different parts of the growing rice（ i.e. the root,stem,leaf and / or the brown rice）. To solve the problem,we have done a pot-growing test experiments by using Yiyou673,a kind of widely planted indica cultivar in Fujian province through screening as a kind of rice to be tested in this paper in a pot-planted way,from which we have made clear the following effects.（ 1） The effect of lime [Ca（ OH）2]application on the availability of Cd,Pb in Cd- Pb contaminated soil;（ 2） The effect of lime [Ca（ OH）2]application on the translocation and accumulation of the contaminants of Cd,Pb in the soil-rice system;（ 3） The main routine of lime [Ca（ OH）2]application results in the low accumulation of Cd and Pb in the said brown rice. Thus,it can be believed that the application of lime can help to increase the soil＇s p H value but decrease the liability of Cd and Pb content in the soil. Besides,it would be possible to decrease the root Pb content significantly in the harvest season,bringing down the contents of Cd and Pb in the stem,leaves and the root iron plaque in the rice-growing process.What is more important,the application of caustic lime has made it reduce the translocation of Cd from the root to the leaves and stems of the leaves as well as that of Pb from the stems to the leaves in the stage of brown rice growing. In addition,the results of our study also indicate that lime application can also reduce Pb accumulation in the brown rice remarkably in comparison with the Cd accumulation in brown ric
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第2期226-231,共6页
Journal of Safety and Environment
基金
国家自然科学基金促进海峡两岸科技合作联合基金项目(U1305232)
关键词
环境学
石灰
土壤
水稻
镉
铅
有效性
转移
environmentalology
lime
soil
rice
cadmium
lead
availability
transfer
