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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, Lei 1 ; Zhang, Jiabao 1 ; Li, Zengqiang 1 ; Xin, Xiuli 1 ; Guo, Zhibin 2 ; Wang, Daozhong 2 ; Li, DongChu 3 ; Zhao, B 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

2.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Hefei 230031, Peoples R China

3.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： Phosphorus deficiency; Long-term experiment; Network analysis; Keystone species; Module

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.046； 五年影响因子：4.884 ）

ISSN： 0929-1393

年卷期： 2020 年 148 卷

页码：

收录情况： SCI

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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