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| Effect of Maize-Pea Intercropping on Crop Copper Accumulation under Different Copper Concentrations |
| Received:March 10, 2015 |
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| KeyWord:copper;maize-peas intercropping;enrichment coefficient;transfer coefficient |
| Author Name | Affiliation | E-mail | | XU Jian-cheng | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China
College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, China | | | WANG Xiao-wei | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China
College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, China | | | NIE Ya-ping | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China
College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, China | | | LUO Jie | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China
College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, China | | | YANG Xiao-yi | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China
College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, China | | | YANG Wen-ting | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China
College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, China | ywt111@163.com |
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| Abstract: |
| Crop intercropping increases biodiversity and stability of agricultural production systems, and it may also enhance plant accumulation of heavy metals from soils. Here a pot experiment was conducted to study the effects of different concentrations of copper(0, 100, 200, 400, 600 mg·kg-1) and two cropping patterns(maize monoculture and maize-pea intercropping) on copper content, accumulation, enrichment coefficient, and transfer coefficient of crops and on soil total copper and available copper content. Results showed that the highest copper content of maize aboveground part in both monoculture and intercropping systems was observed at 200 mg·kg-1, while the lowest copper content in maize shoots was found at 600 mg·kg-1 in monoculture, but 100 mg·kg-1 in intercropping. Under the same concentration of copper added, the content of copper in maize shoot was significantly lower in intercropping than in monoculture systems, but the maize root copper was significantly higher in intercropping than in monoculture systems. Compared with the monoculture, inctercropping practice caused the biggest decrease(49.4%) in maize shoot Cu but the greatest increase(105.4%) in maize root Cu at 100 mg·kg-1. Copper enrichment coefficients of maize shoot in intercropping system were significantly lower than those in monoculture system, but the results were just opposite for the maize root. At all Cu rates but 400 mg·kg-1, copper accumulation in maize tended to be lower in intercropping than in monoculture systems. The copper enrichment coefficients and transfer coefficients in maize in intercropping systems were lower than those in monoculture systems, under different copper stresses, with except of 0 mg·kg-1 and 400 mg·kg-1 treatments. Different cropping systems exhibited no significant effects on total and available copper in soil under different copper concentrations. In conclusion, the maize-pea intercropping could increase the copper content in maize root, reduce copper concentrations in maize shoot, and enhance total copper accumulation by crops, but decreases the copper transport from maize root to shoot in comparison with monoculture. |
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