Differences in nutrient content between heterospecific plant neighbours affect respiration rates of rhizosphere microbiota

IF 4.1 2区 农林科学 Q1 AGRONOMY
Julia Jimeno-Alda, Jose Antonio Navarro-Cano, Marta Goberna, Miguel Verdú
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引用次数: 0

Abstract

Aims

Plant-soil interactions play a pivotal role in governing ecosystem dynamics. Plants directly interact with rhizosphere microorganisms, providing them with labile carbon in exchange for mineral nutrients that are the product of decomposition. Such processes are modulated by ecological interactions between plant species in ways that are not fully understood. We assessed whether rhizosphere respiration rates, as a proxy for decomposition, are influenced by i) heterospecific versus conspecific plant interactions, and whether these effects are positive or negative, and ii) how these effects are linked to the identity and the below- and aboveground functional traits of the interacting plant species.

Methods

We conducted a greenhouse experiment with 300 pairwise hetero- and conspecific combinations of ten Mediterranean herbs and shrubs species, covering a range of functional distances calculated based on 33 traits. In addition, we quantified heterotrophic respiration in the rhizosphere as a proxy of decomposition.

Results

Plant neighbour identity was the main factor explaining changes on respiration rates. Respiration increased along with the functional distance between heterospecific pairs of interacting plants when considering aboveground or nutritional traits. Morphological and belowground traits were not significant predictors of changes on respiration rates.

Conclusions

Interspecific plant-plant interactions lead to faster respiration rates in the rhizosphere as functional distance between neighbours increases. This study provides experimental support that functional trait dissimilarities between heterospecific neighbouring plants promote the rates of organic matter decomposition, showing cascading effects of aboveground interactions on belowground ecosystem processes.

异种植物间养分含量的差异影响根际微生物群的呼吸速率
目的植物-土壤相互作用在控制生态系统动力学中起着关键作用。植物直接与根际微生物相互作用,为它们提供不稳定的碳,以换取作为分解产物的矿物营养物质。这些过程是由植物物种之间的生态相互作用以尚未完全了解的方式调节的。我们评估了作为分解指标的根际呼吸速率是否受到i)异种与同种植物相互作用的影响,以及这些影响是积极的还是消极的,以及ii)这些影响如何与相互作用植物物种的身份和地上、地下功能性状相关联。方法利用地中海10种草本和灌木的300个异种和同种组合,在33个性状计算的功能距离范围内进行温室试验。此外,我们量化了根际的异养呼吸作为分解的代理。结果植物邻居身份是解释呼吸速率变化的主要因素。当考虑地上或营养性状时,呼吸作用随异种对间功能距离的增加而增加。形态和地下性状不是呼吸速率变化的显著预测因子。结论随着植物间功能距离的增加,植物间的相互作用导致根际呼吸速率加快。本研究为异种相邻植物间功能性状差异促进有机质分解速率提供了实验支持,显示了地上相互作用对地下生态系统过程的级联效应。
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来源期刊
Plant and Soil
Plant and Soil 农林科学-农艺学
CiteScore
8.20
自引率
8.20%
发文量
543
审稿时长
2.5 months
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.
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