Under the lens: Carbon and energy channels in the soil micro-food web

IF 9.8 1区 农林科学 Q1 SOIL SCIENCE
Miriam van Bommel , Karoline Arndt , Martin-Georg Endress , Fatemeh Dehghani , Johannes Wirsching , Evgenia Blagodatskaya , Sergey Blagodatsky , Ellen Kandeler , Sven Marhan , Christian Poll , Liliane Ruess
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引用次数: 0

Abstract

While carbon flow through soil decomposition channels is well studied, the associated energy fluxes are less considered. In particular, how microbial substrate and energy turnover are linked to higher trophic levels has hardly been investigated to date. Soil nematode communities can serve as a model group to address this knowledge gap. As important microbial grazers nematodes hold a central position in soil food webs. The present study relates the structure and function of the micro-food web to microbial carbon and energy use efficiency. Microbial biomass (phospholipid fatty acids), activity (substrate-induced growth) and energy flow (substrate-induced heat release) are linked with the nematode fauna, i.e. population density, ecological indices and metabolic footprints. Soils from four agricultural sites in central Europe were compared, either long-term unfertilized or fertilized with farmyard manure.

Environmental conditions (e.g. soil nutrients, moisture) influenced microbial biomass, nematode population density and decomposition channels more than fertilization. While all arable soils were dominated by bacteria, at sites with moderate nutrient status fungi also contributed to carbon and energy flow. The life strategies of microorganisms and nematodes showed a comparable pattern: nutrient-poor unfertilized soils comprised more K-strategists, characterized by an efficient but slow metabolism. Conversely, nutrient-rich soils represented fast cycle systems, dominated by copiotrophic microorganisms and strong r-strategists among nematodes. Across soils, microbial energy use efficiency was quite balanced compared to carbon use efficiency. Remarkably, nematode functional groups were closely linked to microbial substrate turnover efficiency, suggesting nematode faunal analysis as a useful proxy. The nematode Channel Index, a measure for soil decomposition channel activity, is proposed as a tool for mapping microbial carbon and energy turnover.

镜头下土壤微食物网中的碳和能量通道
虽然通过土壤分解通道进行的碳流研究较多,但相关的能量流研究较少。特别是,微生物基质和能量周转如何与更高营养级相联系,迄今为止几乎没有研究。土壤线虫群落可以作为解决这一知识空白的示范群落。作为重要的微生物食草动物,线虫在土壤食物网中占据核心地位。本研究将微食物网的结构和功能与微生物的碳和能量利用效率联系起来。微生物生物量(磷脂脂肪酸)、活性(基质诱导的生长)和能量流(基质诱导的热量释放)与线虫动物群,即种群密度、生态指数和代谢足迹相关联。环境条件(如土壤养分、水分)比施肥对微生物生物量、线虫种群密度和分解途径的影响更大。虽然所有耕地土壤都以细菌为主,但在养分状况适中的地方,真菌也对碳和能量流做出了贡献。微生物和线虫的生活策略呈现出相似的模式:养分贫乏、未施肥的土壤由更多的钾策略生物组成,其特点是高效但缓慢的新陈代谢。相反,养分丰富的土壤则是快速循环系统,主要由共养微生物和线虫中的强r策略者组成。在所有土壤中,微生物的能量利用效率与碳利用效率相当平衡。值得注意的是,线虫功能群与微生物基质周转效率密切相关,这表明线虫动物群分析是一种有用的替代方法。线虫通道指数是衡量土壤分解通道活动的指标,建议将其作为绘制微生物碳和能量周转图的工具。
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来源期刊
Soil Biology & Biochemistry
Soil Biology & Biochemistry 农林科学-土壤科学
CiteScore
16.90
自引率
9.30%
发文量
312
审稿时长
49 days
期刊介绍: Soil Biology & Biochemistry publishes original research articles of international significance focusing on biological processes in soil and their applications to soil and environmental quality. Major topics include the ecology and biochemical processes of soil organisms, their effects on the environment, and interactions with plants. The journal also welcomes state-of-the-art reviews and discussions on contemporary research in soil biology and biochemistry.
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