School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China.
J Hazard Mater. 2021 Aug 15;416:125952. doi: 10.1016/j.jhazmat.2021.125952. Epub 2021 Apr 27.
Plant growth and heavy metal (HM) accumulation is affected by heavy metal bioavailability and nutrient content in soil aggregates during endophyte-assisted phytoremediation. In this study, we evaluated the influence of endophytes inoculation on P. acinosa HM accumulation and soil aggregate physicochemical properties and explored the correlation among them. Endophyte inoculation increased the plant growth and Cd accumulation by 7.95-25.13% and 3.27-19.22%, respectively and the soil aggregate was redistributed with a decrease of 1.88-5.41% of the clay fraction. The available nitrogen, phosphorus and potassium, and organic matter in macro-aggregate and micro-aggregate were significantly improved with endophyte inoculation. In addition, compared to the no inoculation group, endophytes inoculation enhanced the bioavailability of Cd in macro-aggregates by 4.92-15.00% and in micro-aggregate by 0-9.37%. Both multiple linear regression analysis and the structural equation modeling (SEM) analysis showed that the Cd accumulation in P. acinosa was mainly depended on the Cd bioavailability in macro-aggregates and micro-aggregates. In general, this study helped to improve our understanding of soil aggregate HM bioavailability and nutrient content distribution characteristics under endophyte inoculation, which could further explain the mechanisms of endophytes in plant growth promoting and HM accumulation improving.
植物生长和重金属（HM）积累受植物内生菌辅助修复过程中土壤团聚体中重金属生物有效性和养分含量的影响。在本研究中，我们评估了内生菌接种对菰生长和 HM 积累以及土壤团聚体理化性质的影响，并探讨了它们之间的相关性。内生菌接种分别增加了 7.95-25.13%和 3.27-19.22%的植物生长和 Cd 积累，土壤团聚体重新分布，减少了 1.88-5.41%的粘粒。大团聚体和微团聚体中的有效氮、磷、钾和有机质明显增加。此外，与未接种组相比，内生菌接种提高了大团聚体和微团聚体中 Cd 的生物有效性 4.92-15.00%和 0-9.37%。多元线性回归分析和结构方程模型（SEM）分析均表明，菰体内 Cd 积累主要取决于大团聚体和微团聚体中 Cd 的生物有效性。总的来说，本研究有助于提高我们对内生菌接种条件下土壤团聚体 HM 生物有效性和养分含量分布特征的认识，进一步解释了内生菌在促进植物生长和提高 HM 积累方面的作用机制。
