MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Agriculture and Rural Bureau of Jinchengjiang District, Hechi, Guangxi 547000, China.
J Environ Sci (China). 2022 May;115:383-391. doi: 10.1016/j.jes.2021.08.005. Epub 2021 Aug 26.
The combination of intercropping and phytoremediation in the remediation of cadmium contaminated soil is an emerging model in recent years, but the results of previous studies are inconsistent. In the field experiment, eggplant was intercropped with hyperaccumulator Sedum alfredii Hance (inoculated or not inoculated with endophytic bacteria) to study the effects of intercropping on vegetable safety production, phytoremediation efficiency of hyperaccumulator and variation of soil available nutrients. The results showed that the intercropping treatment had a negative effect on the growth of eggplant and Sedum, but endophyte SaMR12 alleviated the inhibition of intercropping on plant growth. Intercropping treatment increases the Cd concentration in edible part of eggplant to 1.34 mg/kg compared with eggplant monoculture (1.19 mg/kg). While the application of SaMR12 reduces the Cd concentration of eggplant fruit to 0.95 mg/kg and significantly promotes the Cd uptake by Sedum. What's more surprising is that compared with eggplant monocropping, the content of soil available nitrogen, phosphorus and potassium in the treatment of intercropping with inoculated Sedum increased significantly. And according to the correlation analysis of various indexes of plants and soil, the Cd content of eggplant is negatively correlated with the available phosphorus and potassium in the soil, while the Cd content of Sedum is positively correlated with it, which suggested that the application of phosphorus and potassium fertilizers in this experimental site was beneficial to reduce Cd content in eggplant and improve Cd phytoextraction of Sedum. Therefore, in the daily production of moderately Cd-contaminated soil, intercropping eggplant with Sedum inoculated with endophytic bacteria is an excellent Phytoextraction Coupled with Agro-safe-production (PCA) pattern.
间作与植物修复联合修复镉污染土壤是近年来出现的一种模式，但以往研究结果并不一致。本田间试验采用茄子与超富集植物（接种或不接种内生菌）间作的方式，研究了间作对蔬菜安全生产、超富集植物修复效率以及土壤有效养分变化的影响。结果表明，间作处理对茄子和菥蓂的生长有抑制作用，但内生菌 SaMR12 缓解了间作对植物生长的抑制作用。与茄子单作（1.19mg/kg）相比，间作处理增加了茄子可食用部分的 Cd 浓度至 1.34mg/kg。而 SaMR12 的应用使茄子果实中的 Cd 浓度降低至 0.95mg/kg，同时显著促进了菥蓂对 Cd 的吸收。更令人惊讶的是，与茄子单作相比，接种菥蓂的间作处理显著增加了土壤有效氮、磷和钾的含量。并且根据植物和土壤各项指标的相关性分析，茄子中 Cd 含量与土壤有效磷、钾呈负相关，而菥蓂中 Cd 含量与土壤有效磷、钾呈正相关，表明在本试验点增施磷、钾肥有利于降低茄子中的 Cd 含量，提高菥蓂对 Cd 的植物提取。因此，在中度 Cd 污染土壤的日常生产中，茄子与接种内生菌的菥蓂间作是一种优秀的植物提取与农业安全生产相结合（PCA）模式。
