Mineral fertilization impacts microbial activity and endophytic fungi but not microbial biomass in semiarid grasslands

IF 2 3区农林科学 Q3 ECOLOGY Pedobiologia Pub Date : 2024-01-01 DOI:10.1016/j.pedobi.2023.150929

Santiago Toledo , Veronica Gargaglione , Pablo L. Peri

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Abstract

Applications of mineral fertilizer to grasslands have become more frequent in recent decades to increase forage production. However, the impacts of mineral fertilizer on the soil microbiome is poorly understood in cold semiarid grassland ecosystems of Southern Patagonia, Argentina. Therefore, our objective was to analyze experimentally the influence of mineral nutrient fertilization (N, P, K, and NPK in combination) on soil microbial community attributes, such as microbial biomass carbon (MBC) and nitrogen (MBN), soil basal respiration (SBR), microbial metabolic coefficients, the colonization of endophytic fungi such as arbuscular mycorrhizal (AM) fungi, and dark septate endophytes (DSE), and aboveground plant productivity. Mineral fertilization with macronutrients (N, P, K, and NPK) decreased the SBR, qCO₂, AM fungi and DSE fungi, but did not generate changes in MBC and MBN. The magnitude of these responses depends on years after fertilization. We found that soil microbiome was strongly dependent on a range of biotic and abiotic factors, such as growing season precipitation, aboveground plant biomass the relationship between the microbial biomass and microbial respiration, and between endophytic fungi and plants. This work improved our understanding of the soil microorganisms’ response to mineral fertilizer application and provides new insights into soil nutrient dynamics and ecosystem functioning.

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矿物肥影响半干旱草地的微生物活动和内生真菌，但不影响微生物生物量

近几十年来，为了提高牧草产量，在草原上施用矿物肥料的频率越来越高。然而，在阿根廷南巴塔哥尼亚寒冷的半干旱草原生态系统中，人们对矿物肥料对土壤微生物组的影响知之甚少。因此，我们的目标是通过实验分析矿物养分肥料（氮、磷、钾和氮磷钾组合）对土壤微生物群落属性的影响，如微生物生物量碳（MBC）和氮（MBN）、土壤基础呼吸（SBR）、微生物代谢系数、内生真菌（如丛枝菌根真菌（AM）和暗隔内生菌（DSE））的定殖以及地上植物生产力。施用大量营养元素（氮、磷、钾和氮磷钾）的矿物肥会降低 SBR、qCO2、AM 真菌和 DSE 真菌，但不会导致 MBC 和 MBN 发生变化。这些反应的程度取决于施肥后的年份。我们发现，土壤微生物组与一系列生物和非生物因素密切相关，如生长季降水量、地上植物生物量、微生物生物量与微生物呼吸之间的关系以及内生真菌与植物之间的关系。这项工作提高了我们对土壤微生物对施用矿物肥料的反应的认识，并为我们了解土壤养分动态和生态系统功能提供了新的视角。

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来源期刊

Pedobiologia 环境科学-生态学

CiteScore

4.20

自引率

8.70%

发文量

审稿时长

64 days

期刊介绍： Pedobiologia publishes peer reviewed articles describing original work in the field of soil ecology, which includes the study of soil organisms and their interactions with factors in their biotic and abiotic environments. Analysis of biological structures, interactions, functions, and processes in soil is fundamental for understanding the dynamical nature of terrestrial ecosystems, a prerequisite for appropriate soil management. The scope of this journal consists of fundamental and applied aspects of soil ecology; key focal points include interactions among organisms in soil, organismal controls on soil processes, causes and consequences of soil biodiversity, and aboveground-belowground interactions. We publish: original research that tests clearly defined hypotheses addressing topics of current interest in soil ecology (including studies demonstrating nonsignificant effects); descriptions of novel methodological approaches, or evaluations of current approaches, that address a clear need in soil ecology research; innovative syntheses of the soil ecology literature, including metaanalyses, topical in depth reviews and short opinion/perspective pieces, and descriptions of original conceptual frameworks; and short notes reporting novel observations of ecological significance.