|
| Grey relational analysis for evaluating the safety of products from a plant-soil system contaminated with Cd |
| Received:September 10, 2018 |
| View Full Text View/Add Comment Download reader |
| KeyWord:soil;Cd;lime;rice-wheat rotation;grey relational analysis |
| Author Name | Affiliation | E-mail | | XU Yao | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | XIAO Heng | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | WU Jun | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | wuj1962@163.com | | MENG Xiao-xia | Sichuan Research Institute of Environmental Protection, Chengdu 610041, China | | | XU Min | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | LI Yan | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | LAI Xing | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | |
|
| Hits: 2008 |
| Download times: 1763 |
| Abstract: |
| 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. |
|
|
|
