Long-Term Phosphorus Deficiency Decreased Bacterial-Fungal Network Complexity And Efficiency Across Three Soil Types In China As Revealed By Network Analysis
文献类型: 外文期刊
作者: Ma, L; Zhang, JB; Li, ZQ; Xin, XL; Guo, ZB; Wang, DZ; Li, DC; Zhao, BZ
作者机构:
关键词: Phosphorus Deficiency; Long-Term Experiment; Network Analysis; Keystone Species; Module
期刊名称: APPLIED SOIL ECOLOGY
ISSN: 0929-1393
年卷期: 2020 年 148 卷
页码:
收录情况: JCR(2021版)
摘要: Soil bacteria and fungi are essential constituents of arable ecosystems. Long-term phosphorus (P) deficiency has been proven to significantly affect microbial community diversity and composition. However, how P deficiency impacts the interplay between bacteria and fungi remains unclear. The objective was to explore the bacterial-fungal co-occurrence patterns in soil as influenced by long-term P deficiency, using network analysis. Bacterial and fungal community datasets were obtained from soils which have consistently and continuously been fertilized with P ( +P) or without P ( -P) for > 20 years in three long-term field experiments in China. Our results showed that the -P network was less complex and less efficient as indicated by fewer edges, lower average degree and higher average path length. Chronic P deficiency simultaneously decreased positive and negative bacterial-fungal edges, implying that both synergistic and antagonistic interactions were enhanced by P application. The keystone species differed between +P and -P network, and those from the +P network showed significant correlations with less soil properties, indicating the - P network was more sensitive to environmental disturbances. Four major modules were observed in both +P and -P networks, and they related with different soil properties, suggesting distinct habitat heterogeneity or niche partitioning. All the modules had similar ecological roles, while the module composition was altered by long-term P deficiency, indicating a possible ecological redundancy. Most of the fungi from the - P treatment were distributed in a special module negatively correlated with available P, indicating that fungi may prefer niches with low P concentration. Taken together, our results illustrated the crucial roles of P availability in microbial community assembly and investigated the responses of co-occurrence patterns to long-term P deficiency by regulating the topological properties, keystone species and module composition of the bacterial-fungal network.
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