Microbial community assembly in soil aggregates: A dynamic interplay of stochastic and deterministic processes
Microbial community assembly in soil aggregates: A dynamic interplay of stochastic and deterministic processes
复制标题
土壤团聚体中的微生物群落聚集：随机和确定性过程的动态相互作用
DOI：
10.1016/j.apsoil.2021.103911
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发表时间：
2021-02-02
影响因子：
4.8
通讯作者：
Dini-Andreote, Francisco
中科院分区：
文献类型：
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作者：
Dong, Menghui;Kowalchuk, George A.;Dini-Andreote, Francisco
了解不同的过程如何在介导群落组装中发挥作用是（微生物）生态学的一个长期主题。特别是在土壤微生物群落中，我们仍然缺乏对组装过程如何在土壤团聚体的精细尺度上构建群落的基本认识。在这项研究中，使用来自长期农田的不同施肥方案的样本来量化随机和确定性过程对土壤细菌群落组装的相对影响。首先，我们发现，与小团聚体相比，较大土壤团聚体中的细菌群落在系统发育上更加聚集（Spearman?s r = -0.366，P < 0.05）。其次，我们发现选择的总体相对影响随着聚集体尺寸的增加而逐渐减小（Mantel r = 0.161，P < 0.01）。通过划分团聚体大小和施肥制度，我们发现施肥（包括化肥、有机肥和生物有机肥）的地点随着团聚体大小的增加表现出更强的选择松弛性和更大的随机性影响；在对照（未受精）处理中未显着观察到的模式。总的来说，我们的结果强调了在土壤团聚体的精细尺度上评估群落组装的重要性，并说明了区域水平的干扰（即农业管理）如何对随机过程和确定性过程的动态相互作用产生影响。
Understanding how distinct processes operate in mediating community assembly is a long-standing theme in (microbial) ecology. Particularly in soil microbial communities, we still lack a fundamental appreciation of how assembly processes structure communities at the fine-scale level of soil aggregates. In this study, samples from a long-term agricultural field subjected to different fertilization regimes were used to quantify the relative influences of stochastic and deterministic processes on soil bacterial community assembly. First, we found bacterial communities to be more phylogenetically clustered in larger soil aggregates comparatively to small aggregates (Spearman?s r = -0.366, P < 0.05). Second, we found the overall relative influence of selection to gradually decrease with an increase of aggregate size (Mantel r = 0.161, P < 0.01). By partitioning aggregate sizes and fertilization regimes, we found that sites subjected to fertilization (including chemical, organic, and bio-organic fertilizers) displayed a stronger relaxation of selection and an increased influence of stochasticity with an increase in aggregate size; a pattern not significantly observed at the control (unfertilized) treatment. Collectively, our results highlight the importance of evaluating community assembly at the fine-scale levels of soil aggregates and illustrate how regional level disturbances (i.e., agricultural management) exert an influence on the dynamic interplay of stochastic and deterministic processes.