基于灰色关联分析法的Cd污染土壤-植物系统安全生产评价  

Grey relational analysis for evaluating the safety of products from a plant-soil system contaminated with Cd

作　　者：许瑶 肖亨 伍钧 孟晓霞[2] 徐敏 李炎 赖星 XU Yao;XIAO Heng;WU Jun;MENG Xiao-xia;XU Min;LI Yan;LAI Xing(College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China;Sichuan Research Institute of Environ?mental Protection, Chengdu 61004,China)

机构地区：[1]四川农业大学环境学院,成都611130 [2]四川省环境保护科学研究院,成都610041

出　　处：《农业环境科学学报》2019年第5期1051-1059,共9页Journal of Agro-Environment Science

基　　金：四川省科技支撑计划项目(2016NZ0039)

摘　　要：为探究施用石灰对土壤-植物系统的影响,实现耕地重金属污染修复和粮食安全生产,本研究以水稻-小麦轮作为研究对象,连续3年施加不同量石灰(T0、T1、T2、T3、T4:0、750、1500、2250、3000 kg·hm-2),分析不同石灰用量对中轻度Cd污染农田的改良效果,并采用灰色关联法(Grey relational analysis, GRA)评估土壤-植物系统,以筛选最佳石灰用量。结果表明:施用石灰后稻麦籽粒Cd积累量变化趋势为T0>T1>T2>T3>T4;与空白(T0)相比,施用石灰使土壤pH从5.33提高到8.36,pH越高土壤Cd可交换态向残渣态的转化越明显。T4处理下土壤pH最高,与T0相比土壤可交换态Cd减少12.45%;与试验前土相比,3年连施石灰对土壤肥力无显著影响,且处理间土壤肥力无明显差异;GRA分析可知,石灰用量为2250 kg·hm^(-2)更适合中轻度Cd污染土壤-植物系统的改良。In order to explore the impact of lime application on soil-plant systems for the restoration of soils that were contaminated with heavy metal, and the safety of the resultant food products, a three-year field experiment was conducted in Cd-contaminated soil that was under rice-wheat rotation to observe the effect of adding different doses of lime[T0, T1, T2, T3, T4:0(control), 750, 1500, 2250, 3000 kg·hm^-2] on soil remediation. The grey relational analysis(GRA)was used to investigate the effects. The results showed that the order of Cd accumulation in the rice and wheat grains after lime application was T0>T1>T2>T3>T4. Compared with T0, soil pH increased from 5.33 to 8.36 in the lime treatments. Higher pH values reduced the Cd exchangeable fraction but promoted the residual one. The highest pH value was determined at T4. The soil exchangeable Cd decreased by 12.45% in T4 treatment compared with T0. Compared with the soil before the experiment, the application of lime over three years had no significant effect on the soil fertility, and the soil fertility under T1, T2, T3,and T4 treatments showed no obvious change(P<0.05). According to the GRA evaluation, the application of lime at a dosage of 2250 kg·hm^-2 was more suitable for improving the holistic plant-soil system with moderately mild Cd-contamination.

关 键 词：土壤 镉 石灰 稻-麦轮作 灰色关联分析 

分 类 号：X53[环境科学与工程—环境工程]