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Root traits mediate functional guilds of soil nematodes in an ex-arable field
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2020-10-07 , DOI: 10.1016/j.soilbio.2020.108038
Chongzhe Zhang , Jiajun Wang , Zhuhong Ren , Zhengkun Hu , Shanyi Tian , Wenqing Fan , Xiaoyun Chen , Bryan S. Griffiths , Feng Hu , Manqiang Liu

One of the greatest challenges in soil ecology is to disentangle the plant-mediated bottom-up factors regulating soil biodiversity and community composition. The soil food web, fundamentally driving nearly all ecosystem functions, is controlled by the quantity and quality of root-mediated resources. Here, a trait-based approach was adopted to explore the divergence of soil nematode functional guilds and their connections to root traits belonging to distinct plant resource-use strategies. Root traits and rhizosphere nematode functional guilds were measured on four plant species in an ex-arable field. Results showed that plant species exhibiting acquisitive strategies promoted nematode abundance in contrast to species with conservative strategies. Further, the results also supported that plant resource-use strategies could regulate nematode life strategies in a bottom-up manner. However, lower proportions of opportunist nematodes in rhizosphere were found in acquisitive plants rather than conservative plants, mainly attributed to the stronger top-down regulation as a dominant control within the former than the later ones. Structure equation modeling revealed that root length density could primarily modulate nematode abundance and functional guilds mainly through changes in nitrogen availability of rhizosphere, as indicated by mineral N and enzymatic stoichiometry. Overall, our findings extend the conceptual framework based on a trait-centred view spanning plants to the soil food web, and this knowledge is critical to understand the mechanisms of ecosystem process.



中文翻译:

根系性状介导可耕地土壤线虫功能协会

土壤生态学中最大的挑战之一是弄清调节土壤生物多样性和群落组成的植物介导的自下而上的因素。从根本上驱动几乎所有生态系统功能的土壤食物网,受根介资源的数量和质量的控制。在这里,采用基于特征的方法来探索土壤线虫功能协会的差异以及它们与属于不同植物资源利用策略的根系特征的联系。在一个可耕地中对四种植物的根性状和根际线虫功能协会进行了测量。结果表明,与采取保守策略的物种相比,表现出获取策略的植物物种提高了线虫的丰度。进一步,结果还支持植物资源利用策略可以自下而上的方式调节线虫的生命策略。然而,在习性植物而不是保守植物中,根际中机会线虫的比例较低,这主要归因于前者比后者更强的自上而下的调控。结构方程建模表明,根长密度可以主要通过根际氮素利用率的变化来主要调节线虫的丰度和功能性协会,如矿质氮和酶促化学计量学所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,而这一知识对于理解生态系统过程的机制至关重要。然而,在习性植物而不是保守植物中,根际中机会线虫的比例较低,这主要归因于前者比后者更强的自上而下的调控。结构方程建模表明,根长密度可以主要通过根际氮素利用率的变化来主要调节线虫的丰度和功能性协会,如矿质氮和酶促化学计量学所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,而这一知识对于理解生态系统过程的机制至关重要。然而,在习性植物而不是保守植物中,根际中机会线虫的比例较低,这主要归因于前者比后者更强的自上而下的调控。结构方程模型表明,根长密度可以主要通过根际氮素利用率的变化来调节线虫的丰度和功能性协会,如矿物氮和酶促化学计量学所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,而这一知识对于理解生态系统过程的机制至关重要。主要归因于前者比后者更强的自上而下的监管。结构方程建模表明,根长密度可以主要通过根际氮素利用率的变化来主要调节线虫的丰度和功能性协会,如矿质氮和酶促化学计量学所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,而这一知识对于理解生态系统过程的机制至关重要。主要归因于前者自上而下的监管要强于后者。结构方程建模表明,根长密度可以主要通过根际氮素利用率的变化来主要调节线虫的丰度和功能性协会,如矿质氮和酶促化学计量学所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,而这一知识对于理解生态系统过程的机制至关重要。如矿物质氮和酶化学计量法所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,这一知识对于理解生态系统过程的机制至关重要。如矿物质氮和酶化学计量法所示。总体而言,我们的发现扩展了基于特质为中心的概念框架,涵盖了从植物到土壤食物网的整个过程,而这一知识对于理解生态系统过程的机制至关重要。

更新日期:2020-10-07
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