摘要
为研究大棚蔬菜种植对土壤重金属含量的影响,选取不同种植年限的蔬菜大棚,分析土壤重金属含量变化特征.结果表明,不同棚龄土壤C r、P b 、A S、H g 含量均随着种植年限的增加而增加;在种植蔬菜1 - 5 a ,土壤C d 、A s 和H g 的含量分别提高1 4 3 . 5 % 、51. 1 % 和6 0 . 2 % ;在种植蔬菜6-10 a ,土壤H g 含量较1 - 5 a 提高105. 5 % ;棚龄11 ~ 15 a 土壤重金属C r 的含量较6 - 10 a 提高4 4 . 3 % ;但不同种植年限土壤中重金属含量均未超过《土壤环境质量标准》二级标准以及《温室蔬菜产地环境质量评价标准》.采用综合污染指数法,根据国家土壤环境质量二级标准评价,综合污染指数均小于0 . 7 ,属于清洁水平、安全等级,但土壤重金属含量随种植年限延长而逐渐提高的现象说明重金属存在一定的累积污染风险,对大棚蔬菜生产存在潜在的安全风险.
To study the impact of greenhouse vegetable planting on heavy metals contained in soil,vegetable greenhouses with different planting years were chosen,and the variation characteristics of heavy metal content in soil were analyzed. The results showed that the contents of Cr,Pb,As,Hg in soil all increased with the increase of planting years. Within 5 years,the contents of Cd,As and Hg increased by 143. 5%,51. 1% and 60. 2% respectively. Compared with 1—5 years,the content of Hg in 6—10 years increased by 105. 5%,and compared with 6—10 years,the content of Cr in 11—15 years increased by 44. 3%. But all the heavy metal contents in different planting years did not exceed the secondary standard of Soil Environmental Quality Standards and the Environmental Quality Evaluation Standards for Farmland of Greenhouse Vegetables Production. Using comprehensive pollution index,the pollution index was below 0. 7 according to the secondary standard of national soil environmental quality,which showed that the soil was at cleaning and security level. But the heavy metal contents in soil gradually increased with the increase of planting years,which indicated that heavy metals run risk of accumulation and had potential security risk for producing greenhouse vegetables.
出处
《河南农业科学》
CSCD
北大核心
2016年第12期62-66,共5页
Journal of Henan Agricultural Sciences
关键词
蔬菜大棚
种植年限
土壤
重金属
评价
vegetable greenhouse
planting years
soil
heavy metal
evaluation
