Biological 12C–13C fractionation increases with increasing community-complexity in soil microcosms
Biological 12C–13C fractionation increases with increasing community-complexity in soil microcosms
复制标题
生物 12C–13C 分馏随着土壤微观世界中群落复杂性的增加而增加
DOI：
10.1016/j.soilbio.2013.10.030
复制
发表时间：
2014
影响因子：
9.7
通讯作者：
F. Ekelund
中科院分区：
文献类型：
--
作者：
Weijun Yang;J. Magid;S. Christensen;R. Rønn;P. Ambus;F. Ekelund
同位素分馏是自然生态系统中普遍存在的现象。当化学元素在食物链中移动时，自然同位素比率会发生变化，因为生物过程倾向于歧视较重的同位素。这种效应可用于追踪物质流动，估计过程速率和确定生物系统中生物体的营养水平。虽然人们普遍认为氮在天然食物链中积累，但碳在多大程度上也是如此，这是有争议的。我们构建了砂微环境，接种了一系列稀释的土壤生物，并以葡萄糖作为有机碳的来源。我们证明了呼吸二氧化碳中13c的比例与群落复杂性呈负相关。因此，我们的研究结果表明，随着协同、竞争和捕食的增加，群落复杂性的增加促进了12c - 13c同位素分馏的增加。
Isotope fractionation is a ubiquitous phenomenon in natural ecosystems. When chemical elements move through food chains, natural isotope ratios change because biological processes tend to discriminate against heavier isotopes. This effect can be used to trace flows of matter, estimate process-rates and determine the trophic level of organisms in biological systems. While it is widely accepted that 15N-accumulates in natural food-chains, it is disputed to which extent this is the case for13C. We constructed sand-microcosms inoculated with a dilution series of soil organisms and amended with glucose as the source of organic carbon. We demonstrated that the proportion of13C in respiratory CO2correlated inversely with community complexity. Our results therefore suggest that increasing community complexity, with increasing synergy, competition and predation, facilitates increasing12C–13C isotopic fractionation.