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| Soil chemical properties and Cd form distribution in Vicia faba and Sonchus asper intercropping system |
| Received:August 17, 2015 |
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| KeyWord:intercropping;rhizosphere soil;available nutrients;cadmium |
| Author Name | Affiliation | E-mail | | TAN Jian-bo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LIU Ning-ning | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yan-qun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | 649332092@qq.com |
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| Abstract: |
| Intercropping food crops with plants with high metal-accumulating ability may reduce the accumulation of metals in the food crops. In this study, a field plot experiment was conducted to examine soil chemical properties(pH value, organic matter, available nitrogen, available potassium, and available phosphorus), soil Cd form distribution, and plant Cd accumulation in monoculture and intercropping systems of Sonchus asper L. Hill and Vicia fabaL. Results indicated that:(1)During the experimental period, soil pH values in V. faba and S. asper monoculturing plots did not significantly change, but declined by 0.11 units in intercropping plot, compared with the initial soil.(2)Soil organic matter content in the intercropping plot was 12.64% and 20.13% higher than that in V. Faba monoculture and S. asper monoculture, respectively.(3)Compared with the initial soil, intercropping and monocropping V. faba increased soil available nitrogen by 139.87% and 155.15%, respectively; monocropping V. faba decreased available potassium by 10.6% while there was little difference in soil available potassium in other systems; soil available phosphorus content showed reduction in all systems.(4)Soil Cd forms were in order of exchangeable > carbonates bound > iron and manganese oxides bound > organic matter bound. Exchangeable Cd content was 21.98% and 22.13% higher in intercropping systems than in V. faba and S. asper monocultures at plant mature stage. However, no difference was observed in other Cd forms.(5)The biomass of S. asper increased by 15.29% in intercropping system, compared with its monoculture, whereas that of V. faba was 24.77% lower in intercropping than in monoculture system.(6)Content of Cd in roots, leaves, bean pods and beans was significantly lower in V. faba intercropping than in monoculturing systems. Cadmium content in shoot of S. asper was significantly higher in intercropping than in monoculture, but Cd content in S. asper roots was not different. In conclusion, intercropping V. faba with S. asper promotes Cd accumulation in S. asper but reduces Cd content in V. faba. |
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