Testing the functional significance of microbial community composition
Testing the functional significance of microbial community composition
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DOI：
10.1890/08-0296.1
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发表时间：
2009-02-01
期刊：
影响因子：
4.8
通讯作者：
Bradford, Mark A.
中科院分区：
文献类型：
--
作者：
Strickland, Michael S.;Lauber, Christian;Bradford, Mark A.
陆地生态系统模型的一个关键假设是，土壤微生物群落，当放置在一个共同的环境中，将以相同的方式发挥作用，无论该社区的组成。考虑到微生物群落的高度物种多样性和微生物快速适应新条件的能力，这种功能冗余的假设似乎是合理的。我们通过比较接种不同微生物群落的实验缩影中的凋落物分解率来测试这一假设。我们发现，从凋落物分解的二氧化碳生产率依赖于微生物接种物，在微生物群落中的差异单独占大量（类似于20%）的变化，总碳矿化。社区，共享一个共同的历史与一个给定的树叶凋落物表现出较高的分解率相比，外国的社区，该栖息地。我们的研究结果表明，生态系统模型中的隐含假设（即，同一环境中的微生物群落功能等同）是不正确的。为了准确预测生物地球化学过程将如何响应全球变化，可能需要考虑微生物群落的组成和/或对过去资源环境的适应。
A critical assumption underlying terrestrial ecosystem models is that soil microbial communities, when placed in a common environment, will function in an identical manner regardless of the composition of that community. Given high species diversity in microbial communities and the ability of microbes to adapt rapidly to new conditions, this assumption of functional redundancy seems plausible. We test the assumption by comparing litter decomposition rates in experimental microcosms inoculated with distinct microbial communities. We find that rates of carbon dioxide production from litter decomposition were dependent upon the microbial inoculum, with differences in the microbial community alone accounting for substantial (similar to 20%) variation in total carbon mineralized. Communities that shared a common history with a given foliar litter exhibited higher decomposition rates when compared to communities foreign to that habitat. Our results suggest that the implicit assumption in ecosystem models (i.e., microbial communities in the same environment are functionally equivalent) is incorrect. To predict accurately how biogeochemical processes will respond to global change may require consideration of the community composition and/or adaptation of microbial communities to past resource environments.