Effects of Mulching with Hyperaccumulator Straw on Growth and Cadmium Content of Grape Seedlings under Cadmium Stress

A pot experiment was conducted to study the effects of mulching with straw of different cadmium hyperaccumulators (Crassocephalum crepidioides, Galinsoga parviflora, Youngia japonica and Gnaphalium affine) on the growth and cadmium content of grape seedlings under cadmium stress. The results showed that mulching with straw of cadmium hyperaccumulators could increase the biomass of grape seedlings commonly. The cadmium content in root of all the straw-mulch treatments except mulching with G. parviflora was higher than monoculture, but all the straw-mulch treatments decreased cadmium content in stem, leaf and shoot. Especially, the biomass of root and shoot of grape seedlings for the treatment of mulching with straw of G. parviflora reached maximum, which were 85.68% and 22.73% higher than monoculture, respectively. Mulching with straw of G. parviflora decreased the content of cadmium in root and shoot of grape seedlings. The cadmium content in root and shoot for the treatment was lowest, and it decreased by 2.13% and 27.82% respectively compared with monoculture. In conclusion, mulching with straw of cadmium hyperaccumulators could promote the growth of grape seedlings, and decrease cadmium content in shoot of grape seedlings, and G. parviflora straw worked best.