PDF(Pubmed)
Abstract：
Seagrass meadows, as typical \"blue carbon\" ecosystems, play critical ecological roles in the marine ecosystem and decline every year. The application of biochar in soil has been proposed as a potential soil amendment to improve soil quality and mitigate global climate change. The effects of biochar on soil bacterial activities are integrally linked to the potential of biochar in achieving these benefits. However, biochar has been rarely applied in marine ecosystems. Whether the application of biochar could work on the seagrass ecosystem remained unknown. In this study, we investigated the responses of sediment and rhizosphere bacterial communities of seagrass Thalassia hemprichii to the biochar addition derived from maize at ratios of 5% by dry weight in the soil during a one-month incubation. Results indicated that the biochar addition significantly changed the sedimental environment with increasing pH, total phosphorus, and total kalium while total nitrogen decreased. Biochar addition significantly altered both the rhizosphere and sediment bacterial community compositions. The significant changes in rhizosphere bacterial community composition occurred after 30days of incubation, while the significant variations in sediment bacterial community composition distinctly delayed than in sediment occurred on the 14th day. Biochar application improved nitrification and denitrification, which may accelerate nitrogen cycling. As a stabilizer to communities, biochar addition decreased the importance of deterministic selection in sediment and changed the bacterial co-occurrence pattern. The biochar addition may promote seagrass photosynthesis and growth by altering the bacterial community compositions and improving nutrient circulation in the seagrass ecosystem, contributing to the seagrass health improvement. This study provided a theoretical basis for applying biochar to the seagrass ecosystem and shed light on the feasible application of biochar in the marine ecosystem. Graphical Abstract.
摘要：
海草草甸,作为典型的“蓝碳”生态系统，在海洋生态系统中起着至关重要的生态作用，每年都在衰退。生物炭在土壤中的应用已被提出作为改善土壤质量和缓解全球气候变化的潜在土壤改良剂。生物炭对土壤细菌活性的影响与生物炭实现这些益处的潜力密切相关。然而,生物炭在海洋生态系统中的应用很少。生物炭的应用是否可以在海草生态系统中起作用尚不清楚。在这项研究中,我们调查了海草Thalassiahemprichii的沉积物和根际细菌群落对从玉米中添加的生物炭的响应，该生物炭的比例为土壤干重的5％。结果表明,随着pH值的增加,生物炭的添加显著改变了沉积环境,总磷,和总钾，而总氮减少。生物炭的添加显着改变了根际和沉积物细菌群落的组成。培养30天后，根际细菌群落组成发生了显著变化，而沉积物细菌群落组成的显着变化明显延迟于第14天发生。生物炭的应用改进了硝化反硝化,这可能会加速氮循环。作为社区的稳定器，生物炭的添加降低了沉积物中确定性选择的重要性，并改变了细菌共生模式。添加生物炭可以通过改变细菌群落组成和改善海草生态系统中的养分循环来促进海草光合作用和生长。有助于改善海草的健康。该研究为生物炭在海草生态系统中的应用提供了理论依据，并阐明了生物炭在海洋生态系统中的可行应用。图形抽象。
