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The effects of living plants and straws of four hyperaccumulator plant species ( Siegesbeckia orientalis L.,  Crassocephalum crepidioides, Galinsoga parviflora  and  Solanum nigrum L.) on the growth and cadmium (Cd) content of  Ziziphus acidojujuba  seedlings were studied through intercropping and straw-applying experiments. Compared to the control, the four hyperaccumulator plant species and their straws increased the biomass, photosynthetic pigment contents, antioxidant enzyme activities and soluble protein content of  Z. acidojujuba  seedlings. The growth of  Z. acidojujuba  seedlings was increased most significantly by intercropping with  G. parviflora  and applying  S. orientalis  straw. Two experiments both reduced Cd content in roots of  Z. acidojujuba  seedlings, while increased the Cd content in shoots of  Z. acidojujuba  seedlings. The Cd content in shoots of  Z. acidojujuba  seedlings increased most significantly when intercropping with  G. parviflora  and applying  C. crepidioides  straw. In summary, four living hyperaccumulator plant species and their straws promoted the growth of  Z. acidojujuba  seedlings while increased the Cd content of the shoots, an outcome not conducive to the remediation of Cd-contamination jujube orchards.

Living plants and straws of four hyperaccumulator plants increase the cadmium uptake of Ziziphus acidojujuba seedlings