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| Effects of apatite and lime on root morphology and cadmium uptake by ryegrass under cadmium stress |
| Received:April 03, 2020 |
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| KeyWord:Cd;ryegrass;root morphology;Cd uptake;apatite;lime |
| Author Name | Affiliation | E-mail | | DU Zhi-min | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China
School of Environmental Engineering, Henan University of Technology, Zhengzhou 450001, China | | | XIANG Ling-yun | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | | | DU Kai-min | Henan Hechuan Construction Supervision Co., Ltd, Zhengzhou 450000, China | | | YANG Wen-ling | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | | | WANG Ji-wen | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | | | LEI Gao | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | | | GUO Xue-bai | Henan Vocational College of Water Conservancy and Environment, Zhengzhou 450008, China | | | GUO Liang | Henan Hechuan Construction Supervision Co., Ltd, Zhengzhou 450000, China | | | ZHOU Jing | Institute of Soil Science, Chinese Academy Sciences, Nanjing 210008, China | | | GONG Tao | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | | | CHEN Guo-can | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | | | ZHEN Jing | Institute of Biology Co. Ltd., Henan Academy of Sciences, Zhengzhou 450008, China | 13629843529@163.com |
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| Abstract: |
| A pot experiment was conducted to test the remediation effects in Cd contaminated soil by applying apatite(CK, L1, L2, and L3 at dosages of 0, 6, 12, and 24 g·kg-1, respectively)and lime(S1, S2, and S3 at dosages of 1, 2, and 4 g·kg-1, respectively). The biomass,root morphology, Cd concentration and accumulation, bioaccumulation factors, soil pH, and available Cd content in soil were measured. The results showed that apatite and lime(except L1 and S1)significantly increased soil pH, biomass, and root length, surface area, volume, tips number, and Cd accumulation in ryegrass, but significantly decreased Cd concentration, bioaccumulation factors, average root diameter, and soil Cd availability. Correlation analysis showed that the root length, surface area, volume, and tips number(root average diameter), had significant negative(posivive) linear correlations with the available Cd content in soil, Cd concentration, and bioaccumulation factors in ryegrass, while these had significant positive(negative)linear correlations with aboveground and root biomass and Cd accumulation in ryegrass. Compared to controls, L3 increased the aboveground and root biomass of ryegrass by 176.0 and 174.4 times; decreased the average root diameter by 29.4%; increased the root length, surface area, volume, and tips number by 20.2, 21.0, 21.3, and 24.5 times, respectively; and increased Cd accumulation in the aboveground parts and the root by 89.6 and 100.9 times, respectively. In general, root morphology could significantly be affected by the availability of Cd in soil, which in turn affects the biomass and uptake of Cd, and also determines the Cd accumulation in ryegrass. Thus, combining apatite at a dosage of 24 g·kg-1 with ryegrass could effectively remediate Cd-contaminated soil. |
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