Effects of Different Planting Densities of <i>Solanum nigrum</i> L. on the Growth and Cadmium Uptake of Young Grapevines
Yuanxiang Yang | Qinfeng Zheng | Jin Wang | Xiulan Lv | Dong Liang | Renyan Liao | Lijin Lin
We determine the best planting density of <i>Solanum nigrum</i> L. when intercropping with young grapevines to decrease cadmium (Cd) uptake by young grapevines. The effects of different planting densities (plant spacing × row spacing, in centimeters, and designated as 40 × 80, 40 × 40, 20 × 40 and 20 × 20, respectively) of <i>S. nigrum</i> on the growth and Cd uptake of young grapevines were studied. The 40 × 80 and 40 × 40 treatments increased the biomass, photosynthetic pigment content and photosynthesis of young grapevines, while the 20 × 40 and 20 × 20 treatments decreased these traits compared with the monoculture. With increasing intercropping density, the antioxidant enzyme activity of both plant species increased. Intercropping with <i>S. nigrum</i> decreased the Cd content in young grapevines, and the 40 × 80, 40 × 40, 20 × 40 and 20 × 20 treatments decreased the shoot Cd content in young grapevines by 20.89%, 26.11%, 38.12% and 45.95%, respectively, compared with the monoculture. Additionally, increasing the intercropping density increased the Cd content and extraction of <i>S. nigrum</i>. Thus, intercropping young grapevine with <i>S. nigrum</i> can decrease Cd uptake in young grapevines while remediating soil Cd-contamination, and the most optimal treatment is 20 × 20 in this experiment.
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