Huanhuan Wu, Rongqin Zhang, Zhuoqun Yin, Yuan Tian, Fan Luo, Yumin Duan, Yuanji Wang, Huike Li
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引用次数: 0
Abstract
Background and aims
Soil microorganisms and dissolved organic matter (DOM) play a prominent role in soil carbon and nutrient cycles. However, the relationship between rhizosphere DOM components and bacterial communities in different cover crops remains unclear. This study accordingly details the relationships between soil DOM and microorganisms in cover crops within apple orchards on the Loess Plateau.
Methods
We selected three cover crops, Gramineae orchardgrass (OG), legume crown vetch (CV), and white clover (WC), to study the bacterial community composition, DOM content and components, and their associations in both rhizosphere and bulk soils.
Results
The available nutrients content in rhizosphere soil was higher than that in bulk soil. The rhizosphere DOM was primarily composed of protein-like substances. The humic-like component predominated in Gramineae treatment, whereas the protein-like component dominated in legume treatment. The rhizosphere bacterial α-diversity decreased compared with that in bulk soil. Network analysis indicated that the relationship between DOM components and bacterial communities in rhizosphere soil was more complex than that in bulk soil, with negative associations being predominant. Moreover, Gramineae cover crops reinforced the association between bacterial community composition and DOM components compared to legume.
Conclusions
Cover crop species significantly affect the relationship between the rhizosphere soil DOM components and bacterial communities, exhibiting a closer relationship under Gramineae cover crop. This study enhances our understanding of the ecological processes through which cover crops regulate bacterial communities and strengthen the interactions with DOM, providing new insights for assessing soil quality in apple orchards.
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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