Roots with larger specific root length and C: N ratio sustain more complex rhizosphere nematode community,Plant and Soil

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Roots with larger specific root length and C: N ratio sustain more complex rhizosphere nematode community
Plant and Soil ( IF 3.9 ) Pub Date : 2022-05-05 , DOI: 10.1007/s11104-022-05465-7
Jingru Zhang _{1,

2} , Zhengkun Hu _{1,

2} , Chongzhe Zhang _{1,

2} , Yiheng Tao _{1,

2} , Xiaoyun Chen _{1,

2} , Manqiang Liu _{1,

2,

3} , Bryan S. Griffiths ₄

Affiliation

Purpose

Roots bridge aboveground and belowground systems, and play a pivotal role in structuring root-associated organisms via influencing food resources and habitat conditions. Most studies focused on the relationships between plant identity and root-associated organisms, however, little is known about how root traits affect nematode communities within the rhizosphere.

Methods

We investigated the relationships between root traits of four plant species and nematode abundance, community structure and trophic complexity in an ex-arable field.

Results

While the relative abundance of herbivores was negatively associated with specific root length (SRL), specific root area (SRA), root length density (RLD) and root C: N ratio, free-living nematodes were positively affected by these traits, implying a multifaceted effect of root traits on root-associated organisms. Importantly, we found that finer root systems promoted the complexity of rhizosphere nematode community, by increasing the relative abundance of high trophic-level nematodes (i.e., omnivores and predators) and enhancing nematode diversity.

Conclusions

Our findings suggest that root traits could comprehensively shape soil community structure and interactions, and provide new insights into soil biodiversity conservation and functional maintenance.

中文翻译：

具有较大比根长度和 C:N 比的根维持更复杂的根际线虫群落

目的

根系连接地上和地下系统，并通过影响食物资源和栖息地条件在构建与根相关的生物体中发挥关键作用。大多数研究都集中在植物特性和根相关生物之间的关系上，然而，对于根性状如何影响根际线虫群落知之甚少。

方法

我们调查了可耕地中四种植物的根系性状与线虫丰度、群落结构和营养复杂性之间的关系。

结果

虽然食草动物的相对丰度与比根长 (SRL)、比根面积 (SRA)、根长密度 (RLD) 和根 C:N 比呈负相关，但自由生活的线虫受到这些性状的正向影响，这意味着根性状对根相关生物的多方面影响。重要的是，我们发现更精细的根系通过增加高营养级线虫（即杂食动物和捕食者）的相对丰度和增强线虫多样性来促进根际线虫群落的复杂性。