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| Effects of intercropping on Pb, Cd, and Zn compounds in Cyperus glomeratus and Vicia faba |
| Received:September 29, 2017 |
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| KeyWord:intercropping;Cyperus glomeratus L.;Vicia faba L.;heavy metal;chemical form |
| Author Name | Affiliation | E-mail | | YU Bao-gang | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | QIN Li | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | qinli2975@ynau.edu.cn | | ZHAN Fang-dong | 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 | | | LI Bo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | WANG Ji-xiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | liyuan@ynau.edu.cn |
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| Abstract: |
| Indoor pot experiments were performed to investigate the effects of Cyperus glomeratus L. and Vicia faba L. intercropping on the chemical forms of Cd, Pb, and Zn found in the plants and soil. Intercropping reduced the biomass of the shoots and roots, soluble sugar content, and chlorophyll content of C. glomeratus by 54.55%, 41.67%, 36.39%, and 33.33%, respectively, but increased the biomass of V. faba shoots by 11.71%. Intercropping reduced the amount of available Pb, Cd, and Zn in the soil. FNaCl(NaCl extractable fraction) as the main form of Pb found in the plants. Intercropping increased the FE-Pb(ethanol-extractable fraction-Pb) contents of C. glomeratus shoots by 23.43% and total Pb contents of C. glomeratus roots by 6.92%~17.80% but reduced the FE-Pb and FW-Pb contents of V. faba shoots by 16.00% and 42.60%, respectively, and total Pb contents of V. faba roots by 1.32%~44.76%. FNaCl and FHCl(HCl extractable fraction) were the main forms of Cd found in the plants. Intercropping increased the FR-Cd(residue fraction-Cd) contents of C. glomeratus shoots by 43.45% and the FHCl-Cd and FR-Cd contents by 6.26% and 30.01% but reduced the FHCl-Cd contents of V. faba shoots by 26.37% and total Cd contents in V. faba roots by 6.09%~68.33%. FHAc(HAc extractable fraction), FW(water extractable fraction), and FNaCl were the main forms of Zn found in the plants. Intercropping increased the FE-Zn contents of C. glomeratus shoots by 12.5% and the total Zn contents of C. glomeratus roots by 5.32%~23.54% but decreased the levels of six Zn forms in V. faba shoots and roots. There was a significant positive correlation between soil available Pb, Cd, and Zn contents and the Pb, Cd, and Zn contents of the shoots and roots of intercropped V. faba. Intercropping reduced the Pb, Cd and Zn contents in the plants of V. faba and was closely related to the decrease in the available Pb, Cd and Zn content in the soil. |
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