Fungal species diversity affects leaf decomposition after drought
Fungal species diversity affects leaf decomposition after drought
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真菌物种多样性影响干旱后叶片分解
DOI：
10.1002/iroh.201501817
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发表时间：
2016
影响因子：
1.9
通讯作者：
C. Canhoto
中科院分区：
文献类型：
--
作者：
A. L. Gonçalves;A. Lírio;M. Graça;C. Canhoto
近年来，关于生物多样性在河流生态系统过程中的重要性的研究有所增加；然而，对其在流动间歇情景中的作用仍然知之甚少。在本研究中，我们进行了一个微观实验，以验证干旱事件下微生物分解橡树叶的多样性保险假设。测试了3种微生物多样性水平，分别是单菌种和3种或8种水生菌丝的混合组合。我们还评估了叶片干燥对碎纸机碎纸机凋落叶质量的影响。与单一菌种相比，混合菌种的分解率和产孢率更高。这种模式在干旱后保持，并通过补充水分迅速恢复分解。真菌介导的分解似乎在丰富（相对于单一）真菌组合的存在下更容易受到刺激，即使在干燥之后，特别是当物种添加发生在较低丰富度水平时。粉碎机消耗量不受叶片干燥的影响，尽管在8种真菌的条件下，摄食率始终较高，并且可能受到优势分类群的身份的影响。预计受干旱影响的碎屑流的食物网将产生自下而上的效应；这些影响的强度似乎取决于环境扰动促进分解者丰富度下降的程度。
The number of studies on the importance of biodiversity in stream ecosystem processes increased in the last years; however, little is still known on its role in scenarios of flow intermittency. In this study, we conducted a microcosm experiment to test the diversity‐insurance hypothesis on microbial decomposing oak leaves exposed to a drought event. Three microbial diversity levels were tested, single species and mixture assemblages of three or eight species of aquatic hyphomycetes. We also evaluated changes in leaf litter quality promoted by leaves desiccation to the shredderSchizopelex festiva. Fungal mixed assemblages resulted in higher decomposition and fungal sporulation rates than single species. This pattern was maintained after drought and decomposition was rapidly reassumed with rehydration. Fungal‐mediated decomposition seems to be more stimulated in the presence of rich (vs. single) fungal assemblages even after desiccation, particularly when species addition occurs at lower levels of richness. Shredder consumption was not affected by leaf desiccation, although feeding rates were consistently higher on leaves conditioned with eight fungal species and likely affected by the identity of the dominant taxa. Bottom‐up effects are expected on the food webs of detritus‐based streams affected by droughts; the intensity of these effects seems to be dependent on the level of decline promoted on decomposers richness by the environmental perturbation.
温带低地溪流超季节水文干旱期间和之后的叶子腐烂过程
影响因子：
1.9
作者：
Schlief
通讯作者：
Schlief