Enhancement of soil aggregation and physical properties through fungal amendments under varying moisture conditions

IF 4.3 2区 生物学 Q2 MICROBIOLOGY
Violeta Angulo, Robert-Jan Bleichrodt, Jan Dijksterhuis, Amandine Erktan, Mariet M. Hefting, Bart Kraak, George A. Kowalchuk
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Abstract

Soil structure and aggregation are crucial for soil functionality, particularly under drought conditions. Saprobic soil fungi, known for their resilience in low moisture conditions, are recognized for their influence on soil aggregate dynamics. In this study, we explored the potential of fungal amendments to enhance soil aggregation and hydrological properties across different moisture regimes. We used a selection of 29 fungal isolates, recovered from soils treated under drought conditions and varying in colony density and growth rate, for single-strain inoculation into sterilized soil microcosms under either low or high moisture (≤−0.96 and –0.03 MPa, respectively). After 8 weeks, we assessed soil aggregate formation and stability, along with soil properties such as soil water content, water hydrophobicity, sorptivity, total fungal biomass and water potential. Our findings indicate that fungal inoculation altered soil hydrological properties and improved soil aggregation, with effects varying based on the fungal strains and soil moisture levels. We found a positive correlation between fungal biomass and enhanced soil aggregate formation and stabilization, achieved by connecting soil particles via hyphae and modifying soil aggregate sorptivity. The improvement in soil water potential was observed only when the initial moisture level was not critical for fungal activity. Overall, our results highlight the potential of using fungal inoculation to improve the structure of agricultural soil under drought conditions, thereby introducing new possibilities for soil management in the context of climate change.

Abstract Image

在不同湿度条件下,通过真菌添加剂提高土壤团聚性和物理特性
土壤结构和聚合对土壤功能至关重要,尤其是在干旱条件下。兼性土壤真菌因其在低水分条件下的恢复能力而闻名,它们对土壤团聚动态的影响也得到了认可。在这项研究中,我们探索了真菌添加剂在不同湿度条件下增强土壤团聚和水文特性的潜力。我们从干旱条件下处理过的土壤中筛选出了 29 个真菌分离株,它们的菌落密度和生长速度各不相同,在低湿度或高湿度(分别为≤-0.96 和 -0.03 兆帕)条件下将单菌株接种到灭菌土壤微生态系统中。8 周后,我们评估了土壤团聚体的形成和稳定性,以及土壤性质,如土壤含水量、疏水性、吸水率、真菌总生物量和水势。我们的研究结果表明,真菌接种改变了土壤的水文特性,并改善了土壤的聚合性,其效果因真菌菌株和土壤湿度而异。我们发现,真菌生物量与土壤聚合体的形成和稳定性之间存在正相关,通过菌丝连接土壤颗粒并改变土壤聚合体的吸水率来实现。只有当初始湿度对真菌活动不重要时,才能观察到土壤水势的改善。总之,我们的研究结果凸显了利用真菌接种改善干旱条件下农业土壤结构的潜力,从而为气候变化背景下的土壤管理提供了新的可能性。
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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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