Effect of Different Plants Combinations on Cadmium Uptake Grown in a Mixed Matrix of Coal Gangue Weathered Material and Soil

doi:10.3969/j.issn.1000-6362.2017.12.005

Abstract

Abstract: Coal gangue with high cadmium (Cd) content is an inevitable product from the process of coal mining. The abandoned coal gangue could cause Cd contamination to the adjacent water and soil. Phytoremediation of heavy metals contamination has become a research hotspot. Using a mixed matrix of coal gangue weathered material and soil (w/w, 1:1) as cultivation medium, a pot experiment was conducted to investigate Cd uptake by ryegrass, chicory, and alfalfa in monoculture or intercropping. The results indicated that ryegrass biomass in monoculture was the largest, but with no significant different for Cd uptake compared with chicory and alfalfa. The biomass and nitrogen, phosphorus, Cd uptake by ryegrass significantly increased after intercropping with chicory or alfalfa. While the significant decrease and no significant change were observed for chicory and alfalfa, respectively. Among all treatments, ryegrass intercropping with alfalfa has the highest aboveground biomass and the uptake of nitrogen, phosphorus, and Cd. Especially, the Cd uptake was 1.29-2.76 times of other planting combinations. Ryegrass intercropping with alfalfa as the optimal planting combination could be used into the remediation of Cd contamination in coal gangue.

Key words: Coal gangue, Cadimium, Ryegrass, Chicory, Alfalfa, Monoculture, Intercropping

LI Xia, WANG Xue, DU Shi-jie, YANG Jun-xia, GAO Zhi-hui, HAN Zhi-ping, ZHEN Li-na. Effect of Different Plants Combinations on Cadmium Uptake Grown in a Mixed Matrix of Coal Gangue Weathered Material and Soil[J]. Chinese Journal of Agrometeorology, 2017, 38(12): 787-794.

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