Cui Zhang, Keqiang Zhou, Zhen Wang, Zhou Zhou, J. Viridiana García Meza, Shaoxian Song, H. Kim, María Luciana Montes, Mostafa Benzaazoua, Ling Xia
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引用次数: 0
摘要
背景与目的人工生物结皮作为碳库在逆转沙漠化过程中发挥着至关重要的作用。然而，目前的研究主要集中在微生物上，而不是生物壳与黏土矿物（如蒙脱石）在生物壳碳泵中的具体相互作用。方法建立基于粘土的人工生物结皮，研究黏土矿物对土壤有机碳（SOC）积累动态的影响。将蒙脱土和阴道微结肠菌共接种，测定微生物生物量碳、有机碳含量和叶绿素a （Chl-a）等与有机碳积累有关的参数。结果实验结果表明，在第84天，蒙脱土-藻类（≥1.4 g dm−2）接种的微生态系统中有机碳含量比藻类接种的微生态系统高3.45倍以上，确定了1.4 g dm−2为蒙脱土添加的最佳面质量密度。此外，蒙脱土在微生物生长和有机碳稳定性中起着至关重要的作用，微生物增殖是有机碳积累的主要驱动力。此外，蒙脱土有利于光合作用能力强的微生物。结论蒙脱土能促进人工生物结壳中微生物的生长和有机碳的积累。因此，蒙脱土可以作为人工生物结壳过程中微生物碳泵的促进剂。未来需要进一步的实地试验来检验蒙脱土对人工生物结皮构建和有机碳积累的长期积极作用。图形抽象
Montmorillonite as an “accelerator” for the microbial carbon pump during artificial biocrust construction
Background and aims
Artificial biocrusts play a crucial role as a carbon pool in reversing desertification. However, current research has focused predominantly on the microbes, not the specific interaction between biocrusts and clay minerals, such as montmorillonite, in the biocrust carbon pump.
Methods
This study established clay-based artificial biocrusts and investigated the effects of a clay mineral on the dynamics of soil organic carbon (SOC) accumulation. Montmorillonite and Microcoleus vaginatus were co-inoculated, and parameters related to SOC accumulation were determined, including microbial biomass carbon, SOC content, and chlorophyll a (Chl-a).
Results
The experimental results demonstrate that on day 84, the SOC contents in the montmorillonite-algae (≥ 1.4 g dm−2) inoculated microcosms were over 3.45 times higher than in those inoculated with algae, identifying 1.4 g dm−2 as the optimal areal mass density of montmorillonite addition. Furthermore, montmorillonite played a crucial role in microbial growth and SOC stability, with microbial proliferation being the primary driver of SOC accumulation. Moreover, montmorillonite favored microorganisms with strong photosynthetic capabilities.
Conclusion
The experimental results indicate that montmorillonite promoted microbial growth and SOC accumulation in artificial biocrusts. Thus, montmorillonite may act as an accelerator for the microbial carbon pump during artificial biocrusts construction. Further field trials examining the positive effects of montmorillonite on artificial biocrust construction and organic carbon accumulation in the long-term are needed in the future.
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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