Department of Civil and Environmental Engineering, the Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.
School of Transportation, Southeast University, Nanjing, China.
Environ Sci Pollut Res Int. 2024 Jan;31(1):1681-1691. doi: 10.1007/s11356-023-31556-8. Epub 2023 Dec 26.
Root-associated bacteria play a vital role in the soil ecosystem and plant productivity. Previous studies have reported the decline of bacterial community and rhizosphere soil quality in the cultivation of some medicinal plants (i.e., Pseudostellaria heterophylla). Phosphorus (P)-modified biochar has the potential to improve soil health and quality. However, its influence on the bacterial community and diversity in the rhizosphere of medicinal plants is not well understood. Therefore, this study aims to investigate the effects of P-modified biochar on the bacterial community and diversity in the rhizosphere of P. heterophylla. Soil samples were collected from the rhizosphere of 4-month P. heterophylla under control (no biochar), 3% unmodified and 3% P-modified biochar treatments, respectively. Compared with control and unmodified biochar treatment, P-modified biochar significantly increased the relative abundance of plant-beneficial bacteria (P < 0.05), particularly Firmicutes, Nitrospirae and Acidobacteria. The relative abundance of Bacillus, belonging to Firmicutes, was dramatically raised from 0.032% in control group to 1.723% in P-modified biochar-treated group (P < 0.05). These results indicate the potential enhancement of soil quality for the growth of medicinal plants. The application of biochar significantly increased bacterial richness and bacterial diversity (P < 0.05). P modification of biochar did not have significant effects on soil bacterial richness (P > 0.05), while it reduced Shannon and increased Simpson diversity index of soil bacterial communities significantly (P < 0.05). It indicates a decrease in bacterial diversity. This research provides a new perspective for understanding the role of P-modified biochar in the rhizosphere ecosystem.
根际细菌在土壤生态系统和植物生产力中起着至关重要的作用。先前的研究报告称，在一些药用植物（如假繁缕）的栽培中，细菌群落和根际土壤质量下降。磷（P）修饰生物炭有可能改善土壤健康和质量。然而，其对药用植物根际细菌群落和多样性的影响尚不清楚。因此，本研究旨在研究 P 修饰生物炭对假繁缕根际细菌群落和多样性的影响。从对照组（无生物炭）、3%未修饰和 3%P 修饰生物炭处理的 4 个月龄假繁缕根际分别采集土壤样本。与对照和未修饰生物炭处理相比，P 修饰生物炭显著增加了植物有益细菌的相对丰度（P<0.05），特别是Firmicutes、Nitrospirae 和 Acidobacteria。芽孢杆菌（Firmicutes）的相对丰度从对照组的 0.032%急剧上升到 P 修饰生物炭处理组的 1.723%（P<0.05）。这些结果表明，P 修饰生物炭有可能提高土壤质量，促进药用植物的生长。生物炭的应用显著增加了细菌丰富度和细菌多样性（P<0.05）。P 修饰生物炭对土壤细菌丰富度没有显著影响（P>0.05），但显著降低了土壤细菌群落的 Shannon 多样性指数，增加了 Simpson 多样性指数（P<0.05）。这表明细菌多样性减少。本研究为理解 P 修饰生物炭在根际生态系统中的作用提供了新的视角。
