Lu Qiyu, Li Jianhua, Chen Fabo, Liao Ming'an, Lin Lijin, Tang Yi, Liang Dong, Xia Hui, Lai Yunsong, Wang Xun, Chen Cheng, Ren Wei
College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China.
Sichuan Ya'an Municipal Product Quality Supervision and Inspection Institute (National Tea Product Quality Supervision and Inspection Center, Sichuan), Ya'an, Sichuan, China.
Environ Monit Assess. 2017 Nov 9;189(12):622. doi: 10.1007/s10661-017-6322-7.
Intercropping affects heavy-metal uptake in plants. In this study, three cadmium (Cd)-accumulator species (Stellaria media, Malachium aquaticum, and Galium aparine) were intercropped together in Cd-contaminated soil to study the effects of intercropping on co-remediation. Mutual intercropping significantly increased the biomasses of S. media, M. aquaticum, and G. aparine compared with their respective monocultures. The photosynthetic pigment contents of three species were not significantly affected by mutual intercropping. Mutual intercropping did not increase the Cd contents in roots and shoots of G. aparine, but it increased the Cd contents in roots of S. media and M. aquaticum. It also decreased the Cd contents in shoots of S. media and M. aquaticum. Only G. aparine intercropped with M. aquaticum and three-species intercropping increased Cd-accumulation levels in whole plants of each species. Only S. media intercropped with M. aquaticum and three-species intercropping increased the Cd accumulation at the whole plant level in every plant in a single pot, with S. media intercropped with M. aquaticum showing the greatest increase. Therefore, S. media intercropped with M. aquaticum and three-species intercropping may improve the efficiency of phytoremediation of Cd-contaminated soil, with S. media intercropped with M. aquaticum representing the best combination.
间作影响植物对重金属的吸收。在本研究中，将三种镉（Cd）富集植物（繁缕、水马齿苋和猪殃殃）在镉污染土壤中间作，以研究间作对联合修复的影响。与各自的单作相比，相互间作显著增加了繁缕、水马齿苋和猪殃殃的生物量。相互间作对三种植物的光合色素含量没有显著影响。相互间作没有增加猪殃殃根和地上部的镉含量，但增加了繁缕和水马齿苋根中的镉含量。它还降低了繁缕和水马齿苋地上部的镉含量。只有猪殃殃与水马齿苋间作以及三种植物间作提高了每个物种整株植物的镉积累水平。只有繁缕与水马齿苋间作以及三种植物间作提高了单个花盆中每株植物在整株水平上的镉积累，其中繁缕与水马齿苋间作的增加幅度最大。因此，繁缕与水马齿苋间作以及三种植物间作可能提高镉污染土壤植物修复的效率，繁缕与水马齿苋间作是最佳组合。
