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[1]GUO Xiongfei.Effects of Biochar and Intercropping on the Growth and Root Morphology of Machilus pauhoi Under Heavy Metal Stress[J].Research of Soil and Water Conservation,2019,26(02):337-344,351.

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Effects of Biochar and Intercropping on the Growth and Root Morphology of Machilus pauhoi Under Heavy Metal Stress

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 337-344,351 Column: Public date: 2019-04-28

Title:: Effects of Biochar and Intercropping on the Growth and Root Morphology of Machilus pauhoi Under Heavy Metal Stress

Author(s):: GUO Xiongfei^1,2,3; 1. College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan 637000, China;
2. Institute of Environmental Science, China West Normal University, Nanchong, Sichuan 637000, China;
3. College of Resources and Environmental Sciences, South China Agricultural University, Guangzhou 510642, China

Keywords:: biochar; intercropping; plant growth; root morphology; heavy metal

CLC:: S153;S792.24

DOI:: -

Abstract:: Machilus pauhoi was taken as the test material, a pot experiment at greenhouse was conducted to study the effect of the combination of different dosages (0, 1%, 4%, 8%) of biochar and intercropping Cassia occidentalis on soil carbon and nitrogen nutrient, Machilus pauhoi and Cassia occidentalis plant height, biomass and root morphology under heavy metal stress, in order to study the combination of biochar and intercropping on the Machilus pauhoi growth promoting synergistic effect. The results showed that，under Cd，Cr and Zn stresses，the effect of intercropping on the soil carbon and nitrogen contents was not significant; the soil carbon and nitrogen contents and C/N ratio significantly increased with the increase of the biochar application amount; the influences of biochar and intercropping on the plant height growth of the two species were not obvious at early growth stage, but with the extension of their growing periods, the growth differences of the two species between different treatments both started to appear gradually. There was no significant difference of the Cassia occidentalis plant height among different amounts of biochar application, while the plant height in biochar treatment groups were significantly higher than that in control group. At the same time, biochar was helpful for the development of root morphology and dry matter accumulation. Compared with monoculture under control (CK), Machilus paunoi root and shoot dry weight increased by 81.48% and 122.52% with the combination of T₃ treatment and intercropping. Compared with no application of biochar, the growth rate of Cassia occidentalis root and shoot dry weight increased by 27.12%～39.63% and 17.19%～19.03%, respectively, under each biochar treatments. Biochar significantly increased the morphological parameters of Cassia occidentalis and Machilus paunoi root. Compared with monoculture, Machilus paunoi root morphological parameters in intercropping treatments also increased, but the effect was not significant. The interaction effect of biochar and intercropping on plant growth was more obvious than single treatment. This study could provide scientific basis and reference for the vegetation afforestation in the mild polluted areas.

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