摘要
蔬菜品质越来越引起全社会的关注,如何预防和治理重金属对蔬菜产品的污染是目前需要迫切解决的环境问题。通过模拟铬污染土壤施硅的盆栽试验,探讨硅、铬在土壤-蔬菜作物系统间的迁移、转化特性,为研究通过施硅调控蔬菜重金属污染提供依据。研究结果表明:(1)在不同铬水平胁迫下,硅在小白菜体内的积累量不同,根吸收硅的量不同;总的趋势是在试验的各个铬污染水平,一定的施硅量均可提高小白菜地上部的硅含量。(2)铬的各污染处理均有随施硅量的提高而降低小白菜铬积累量的趋势,说明施硅可有效抑制小白菜对铬的吸收。(3)硅的施入,可抑制根吸收的铬进一步运输到地上部,因而减轻了小白菜可食部分受铬污染的程度,在高浓度铬污染处理下,小白菜根中的铬较难运转到茎部;而运输到茎部的铬却易于向叶部转移。(4)硅的加入降低了小白菜各部位对铬的富集能力,从而降低了重金属铬对小白菜的污染。
Today, the entire society has paid more and more attention to quality of vegetables. The prevention and control of heavy metal pollution on vegetables is an urgent environmental problem. This paper studied on migration and transformation of Si and Cr in soil-vegetables system by making a simulated pot experiment, which is designed to apply Si to artificial Cr polluted soil. It supplied the basis for further study on application of Si to control heavy metal pollution on vegetables. The results indicate： （1） Under various levels of Cr stress, Si cumulate in Brassica chinensis changed and Si uptake by Brassica chinensis＇s roots is different. A certain level of Si can improve Si content in aboveground part of Brassica chinensis under each level of Cr stress. （2）Cr cumulate in Brassica chinensis decreased as increasing the application of Si at each level of Cr treatment, which shows that Si can decrease Cr uptake effectively. （3）Si inhibited the Cr which is absorbed by roots transporting to aerial part, therefore the contamination of adible part reduced. Cr in roots is hard to be transported to stem under high level Cr stress, but once arrived at stem, it＇s easy for they to be transfered to leaf. （4）Si reduced each part of Brassica chinensis＇s accumulation ability to Cr, thus decreased the Cr pollution on Brassica chinensis.
出处
《水土保持学报》
CSCD
北大核心
2008年第2期66-69,150,共5页
Journal of Soil and Water Conservation
基金
广东省科技攻关项目(2006B20601007,2007B060401030)
关键词
小白菜
铬污染土壤
施硅
吸收累积
迁移
Brassica chinensis
soil of chrome
silicon
uptake and cumulate
transplante
