Eleonora Egidi, Dylan Bristol, Kamrul Hassan, David Tissue, Ian J. Wright, Uffe N. Nielsen
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However, the relative influence of these factors is poorly understood, as are interactive effects between factors and the degree to which their influence varies among climate zones.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>To address this gap, we compared the diversity and composition of soil microbial communities associated with co-occurring C<sub>3</sub> and C<sub>4</sub> grasses from arid and mesic environments, and plant traits influencing them.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Climate emerged as the main determinant of plant traits and microbial community properties. Within each climatic region, above- and below-ground traits and soil properties differentially affected microbial community composition, and their relative influence varied among communities. 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引用次数: 0
摘要
背景和目的土壤特性和植物性状都会影响与植物相关的土壤微生物群落的多样性、组成和功能。为了填补这一空白,我们比较了干旱和中温带环境中与共生 C3 和 C4 禾本科植物相关的土壤微生物群落的多样性和组成,以及影响这些群落的植物性状。结果气候成为植物性状和微生物群落特性的主要决定因素。在每个气候区,地面和地下性状以及土壤特性对微生物群落组成的影响各不相同,其相对影响也因群落而异。在中温带和干旱环境中,与落叶的数量和质量(如特定叶面积、叶 C 含量)有关的地面特征和养分供应是对群落组成影响最大的变量。然而,在干旱地区,地下性状(即根组织密度和比根面积)对真核生物群落的结构有显著的贡献,这支持了根在受限环境中作为真核生物分化的重要驱动力的作用。此外,干旱地区 C4 植物的存在提高了纤毛虫原生动物的相对丰度,并在干旱适应性特征(如细根丰度降低)的介导下,从绿藻中招募了更多可能有益的微生物群落成员。
The influence of plant traits on soil microbial communities varies between arid and mesic grasslands
Background and aims
Both soil properties and plant traits shape the diversity, composition and functions of plant-associated soil microbial communities. However, the relative influence of these factors is poorly understood, as are interactive effects between factors and the degree to which their influence varies among climate zones.
Methods
To address this gap, we compared the diversity and composition of soil microbial communities associated with co-occurring C3 and C4 grasses from arid and mesic environments, and plant traits influencing them.
Results
Climate emerged as the main determinant of plant traits and microbial community properties. Within each climatic region, above- and below-ground traits and soil properties differentially affected microbial community composition, and their relative influence varied among communities. In both mesic and arid environments aboveground traits related to quantity and quality of leaf litter (e.g., specific leaf area, leaf C content) and nutrient availability were the most influential variables for community composition. However, in arid regions, belowground traits (i.e., root tissue density and specific root area) significantly contributed to structure the eukaryotic community, supporting the role of roots as important driver of eukaryotic differentiation in constrained environments. Further, the presence of C4 plants in the arid region resulted in higher relative abundance of ciliate protists and higher recruitment of potentially beneficial microbial community members from green algae mediated by drought adaptation traits (e.g. decreased abundance of fine roots).
Conclusions
Overall, our study revealed a differential response of microbial communities to environmental conditions, suggesting that soil microbial community composition is influenced by trade-offs between host adaptive traits across distinct climatic regions.
期刊介绍:
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.