Eating from the same plate? Revisiting the role of labile carbon inputs in the soil food web.
Eating from the same plate? Revisiting the role of labile carbon inputs in the soil food web.
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DOI：
10.1016/j.soilbio.2016.06.023
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发表时间：
2016-11
影响因子：
9.7
通讯作者：
Caruso, Tancredi
中科院分区：
文献类型：
--
作者：
de Vries, Franciska T.;Caruso, Tancredi
越来越多的实证研究正在挑战经典土壤食物网模型的核心基础。该模型假设细菌消耗不稳定基质的速度是真菌的两倍，并且菌根真菌不分解有机物质。在这里，我们建立在新出现的证据，指出显着消费的不稳定的C真菌，和外生菌根真菌分解有机质的能力，表明不稳定的C构成了一个主要的，目前被低估的C源土壤食物网。我们使用一个简单的模型来描述一个不稳定的C池和真菌和细菌的消耗，真菌和细菌种群可以共存于一个稳定的状态下，大量的输入到不稳定的C池和高真菌使用不稳定的C。我们提出了一个新的概念模型的土壤食物网的底层营养水平，有机C组成的一个连续的池，而不是两个或三个不同的池，和腐食性真菌使用大量的不稳定的C。纳入这些概念将增加我们对土壤食物网动态和在不断变化的条件下运作的理解。传统土壤食物网的基本假设正在受到挑战。我们认为，不稳定的C形成一个大的和动态的C输入到土壤食物。我们表明，真菌和细菌可以共存，真菌不稳定的C使用显着。我们提出了一个新的不稳定的C驱动的概念模型的基础上，这些发现。这些概念将增加我们对土壤食物网动态的理解。
An increasing number of empirical studies are challenging the central fundamentals on which the classical soil food web model is built. This model assumes that bacteria consume labile substrates twice as fast as fungi, and that mycorrhizal fungi do not decompose organic matter. Here, we build on emerging evidence that points to significant consumption of labile C by fungi, and to the ability of ectomycorrhizal fungi to decompose organic matter, to show that labile C constitutes a major and presently underrated source of C for the soil food web. We use a simple model describing the dynamics of a recalcitrant and a labile C pool and their consumption by fungi and bacteria to show that fungal and bacterial populations can coexist in a stable state with large inputs into the labile C pool and a high fungal use of labile C. We propose a new conceptual model for the bottom trophic level of the soil food web, with organic C consisting of a continuous pool rather than two or three distinct pools, and saprotrophic fungi using substantial amounts of labile C. Incorporation of these concepts will increase our understanding of soil food web dynamics and functioning under changing conditions. The fundamental assumptions in the classical soil food web are being challenged. We argue that labile C forms a large and dynamic C input to the soil food. We show that fungi and bacteria can coexist with significant fungal labile C use. We propose a new labile C driven conceptual model based on these findings. These concepts will increase our understanding of soil food web dynamics.
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影响因子：
4.8
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.1073/pnas.1514435112
发表时间：
2015-11-24
影响因子：
11.1
作者：
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通讯作者：
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