Effects of Intercropping Density of Galinsoga parviflora on Cadmium Accumulation of Soybean

Abstract

Abstract:The effects of intercropping different density (1, 2, 3, 4 and 5) of cadmium (Cd) hyperaccumulator Galinsoga parviflora on cadmium accumulation of soybean were investigated through pot experiment. The results showed that intercropping with 1 G. parviflora seedling increased biomass of soybean compared with monoculture, and decreased when intercropping with 2, 3, 4 and 5 G. parviflora seedlings. Intercropping with different density of G. parviflora decreased Cd content in soybean compared with monoculture, and the more number of G. parviflora, the lower Cd content in soybean. When the density was not more than 3, intercropping with soybean increased biomass of G. parviflora, and decreased Cd content in G. parviflora. Intercropping with soybean increased Cd extraction by G. parviflora. Therefore, the best density of G. parviflora to intercropping with soybean was 1, which could be used in the Cd-contaminated soil for the phytoremediation.

Intercropping with the potential cadmium hyperaccumulator Solanum photeinocarpum, and its post‐grafting generations, decrease cadmium uptake and promote growth of cherry

“…[11][12][13] In this study, cherry intercropped with S. photeinocarpum and its post-grafting generations increased the biomass of cherry to some extent, while decreased the biomass of S. photeinocarpum and its post-grafting generations. These results are consistent with previous studies, 24,31,32 indicating that competition was mainly involved in the intercropping system of cherry and S. photeinocarpum or its post-grafting generations. In this study, the biomass of cherry seedlings was higher than S. photeinocarpum and its post-grafting generations.…”

Co-Cropping Indian Mustard and Silage Maize for Phytoremediation of a Cadmium-Contaminated Acid Paddy Soil Amended with Peat

“…Similar observations on the concentration and accumulation of Cd in silage maize shoots were obtained in the CIS systems ( Table 5 ). Generally, our results are in good agreement with the findings of Lin et al [ 41 ] and Ma et al [ 42 ], who also observed positive density-dependent uptake of Cd by Gallant soldier plants.…”

“…In contrast to the peat-amended treatments, the results of non-amended treatments showed that even though the plant density reached 4 plants per pot, the shoot biomass of individual Indian mustard plants did not change significantly in the MI and CIS systems ( Supplemental Figure S2 ). With or without peat amendment, our results obtained in the CIS systems are consistent with the findings of Lin et al [ 41 ] and Ma et al [ 42 ], who observed a similar phenomenon in their inter-cropping studies on the relationship between hyperaccumulator Gallant soldier ( Galinsoga parviflora ) density (2 and 4 plants pot −1 ) and individual shoot biomass. However, the authors also found that, when Gallant soldier plants were inter-cropped with radish ( Raphanus sativus ) or soybean ( Glycine max ), the shoot biomass of individual Gallant soldier plants increased with increasing plant density up to 3 plants per pot [ 41 , 42 ].…”

“…Plant density could also affect Cd uptake by plants [ 41 , 42 ]. In the present study, the concentration and accumulation of Cd in Indian mustard shoots generally showed significantly increasing trends with increasing plant density both in the MI and CIS systems (except in CIS-2 vs. CIS-4, the shoot Cd concentration remained unchanged regardless of the peat application; Figure 2 b and Supplemental Figure S1 ).…”