Soil mineral fraction influences the bacterial abundance: evidence from a mineral and plant materials incubation study
Soil mineral fraction influences the bacterial abundance: evidence from a mineral and plant materials incubation study
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土壤矿物成分影响细菌丰度：矿物和植物材料孵化研究的证据
DOI：
10.1007/s10533-022-00978-w
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发表时间：
2022
期刊：
影响因子：
4
通讯作者：
Tokuchi Naoko
中科院分区：
文献类型：
--
作者：
Yokobe Tomohiro;Hyodo Fujio;Tateno Ryunosuke;Tokuchi Naoko
微生物产物（主要是死灵）是陆地系统中稳定土壤有机质（SOM）的关键贡献者，并且微生物群落的稳定性可能有所不同。植物可以通过凋落物质量和植物输入的进入位点（地上或地下）来控制微生物群落。然而，土壤矿物成分（由于土壤质地等特征）是否也能控制微生物群落，目前尚不清楚。我们进行了两次模型土壤培育实验（E1 和 E2）以模拟四种田间土壤。所包括的材料是植物材料，例如土壤系统中的一般植物投入，以及来自不同田间土壤的四种矿物材料（即“四种原始田间土壤”），其SOM通过燃烧去除。 E1使用草酸盐和葡萄糖模拟根系分泌物，E2使用阔叶、针叶叶、树枝和细根模拟植物凋落物。 E1 和 E2 中磷脂脂肪酸 (PLFA) 的微生物（主要是细菌）群落结构因矿物材料而表现出差异，考虑植物材料后的差异与四种原始田间土壤的差异相似。此外，E2 中细菌 PLFA 的丰度随着淤泥和粘土含量的增加而增加，并且与四种原始田间土壤中细菌 PLFA 的丰度相关。这项研究表明，即使在本实验的情况下，在多种植物投入的条件下，矿物质组分也会以与田间土壤系统一致的方式强烈影响细菌群落。
Microbial products, largely the necromass, are key contributors to stable soil organic matter (SOM) in terrestrial systems, and microbial communities may differ in the stabilization. Plants can control microbial communities through litter quality and entry sites of plant inputs (above- or below-ground). However, whether soil mineral fractions (due to the characteristics such as soil texture) can also control the microbial communities, remains unclear. We conducted two model soil incubation experiments (E1 and E2) in order to simulate the four field soils. Materials included were plant materials, such as general plant inputs in soil systems, and four mineral materials derived from different field soils (i.e., “the four original field soils”), with their SOM removed by combustion. E1 was undertaken to simulate root exudate using oxalate and glucose, and E2 was undertaken to simulate plant litter using broad leaves, coniferous leaves, branches, and fine roots. The microbial (mainly bacterial) community structure from phospholipid fatty acid (PLFA) across E1 and E2 showed differences due to the mineral materials, and the differences after accounting for plant materials are similar to the difference in the four original field soils. Additionally, the abundance of bacterial PLFAs in E2 increased with silt and clay content and was correlated with the abundance of the bacterial PLFAs in the four original field soil. This study implies that even in the case of this experiment under such conditions as a broad variety of plant inputs, mineral fractions strongly influence bacterial communities, in a manner consistent with field soil systems.