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| Grey relational analysis for evaluating the effects of lime combined with organic fertilizer on a cadmiumcontaminated soil-plant system |
| Received:December 29, 2021 |
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| KeyWord:soil fertility;passivation;Cd-contaminated soil;soil remediation |
| Author Name | Affiliation | E-mail | | XIAO Hao | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | HUANG Bohao | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | SUN Kai | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | XU Min | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | xumin_xyz@126.com | | WU Jun | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| In this study, a soil-based pot experiment was conducted with the combined application of lime and organic matter to explore a suitable way to alleviate soil damage caused by long-term lime application. There were six treatments including control(CK), organic fertilizer(OF:3 000 kg · hm-2), lime(FT:1 500 kg · hm-2), and the combined application of lime and organic fertilizer at three application ratios:SO1(1 500 kg·hm-2+3 000 kg·hm-2), SO2(2 250 kg·hm-2+3 000 kg·hm-2), and SO3(3 000 kg·hm-2+3 000 kg·hm-2). Grey relational analysis(GRA)was used to comprehensively evaluate the effect of different treatments on soil-plant systems to select the most suitable application ratio. The results showed that soil pH increased with increasing lime addition rate, and compared with CK, SO3 increased the pH by 14.9%, indicating that the combination of lime and organic matter improved soil pH. Soil residual Cd content increased and soil exchangeable Cd content decreased in all treatments compared with those in CK. With an increase in lime application rate, the proportion of residual Cd increased and exchangeable Cd decreased. SO3 had the highest shoot biomass, and the shoot of pakchoi under SO3 treatment increased by 87.9% compared with that under CK. Compared with CK, both lime and organic fertilizer reduced the content of Cd in pakchoi, and the reduction effect in different treatments was SO3>SO2>SO1>FT>OF. Based on GRA, the data showed that SO3 was the most suitable path for soil remediation, with the highest grey relational degree. |
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