National Key Laboratory of Crop Improvement for Stress Tolerance and Production, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, Yangling, Shaanxi 712100, China.
National Key Laboratory of Crop Improvement for Stress Tolerance and Production, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
Sci Total Environ. 2024 Jan 1;906:167556. doi: 10.1016/j.scitotenv.2023.167556. Epub 2023 Oct 5.
Land abandonment is considered an effective strategy for ecological restoration on a global scale. However, few studies have focused on how environmental heterogeneity associated with the age of land abandonment affects the assembly and potential functions of the soil microbial community. In the present study, we investigated the community assembly of soil bacteria and fungi as well as the stability of soil networks and their potential functions in the chronosequence of abandoned apple orchards. We elucidated that the Shannon diversity of bacteria and the richness of fungi increased as land abandonment progressed. In addition, land abandonment destabilized the microbial network stability but increased network complexity. Soil available nitrogen, total carbon, and moisture are the potentially important factors in shaping the soil microbial assembly. Importantly, we showed that the microbial community diversity and functional diversity presented a synchronization effect in response to the different stages of land abandonment. Furthermore, specific bacterial taxa related to carbon fixation, dissimilatory nitrate reduction, and organic phosphorus mineralization were significantly enriched during the early abandonment stage. Collectively, these results indicate that land abandonment significantly transformed soil microbiome assembly and functional adaptation during the restoration process. These findings provide valuable insights into the influence of ecological restoration on soil microbiome and ecosystem functions in arable areas.
土地撂荒被认为是全球范围内生态恢复的有效策略。然而，很少有研究关注与土地撂荒年龄相关的环境异质性如何影响土壤微生物群落的组装和潜在功能。在本研究中，我们调查了土壤细菌和真菌群落的组装以及土壤网络的稳定性及其在废弃苹果园时间序列中的潜在功能。结果表明，随着土地撂荒的进行，细菌的香农多样性和真菌的丰富度增加。此外，土地撂荒会降低微生物网络的稳定性，但会增加网络的复杂性。土壤有效氮、总碳和水分是塑造土壤微生物组装的潜在重要因素。重要的是，我们表明，微生物群落多样性和功能多样性对土地撂荒的不同阶段表现出同步效应。此外，与固碳、异化硝酸盐还原和有机磷矿化相关的特定细菌类群在早期撂荒阶段显著富集。总之，这些结果表明，土地撂荒在恢复过程中显著改变了土壤微生物组的组装和功能适应。这些发现为生态恢复对耕地土壤微生物组和生态系统功能的影响提供了有价值的见解。
