首页> 外文期刊>Ecological research >Large ~(13)C/~(12)C and small ~(15)N/~(14)N isotope fractionation in an experimental detrital foodweb (litter-fungi-collembolans)
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Large ~(13)C/~(12)C and small ~(15)N/~(14)N isotope fractionation in an experimental detrital foodweb (litter-fungi-collembolans)

机译:实验性碎屑食物网中的大〜(13)C /〜(12)C和小〜(15)N /〜(14)N同位素分馏(凋落物-真菌-collembolans)

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摘要

Correctly estimating the trophic fractionation factors (△~(15)N and △~(13)C) in controlled laboratory conditions is essential for the application of stable isotope analysis in studies on the trophic structure of soil communities. Laboratory experiments usually suggest large ~(15)N/~(14)N and small ~(13)C/~(12)C trophic fractionation, but in field studies litter-dwelling microarthropods and other invertebrates are consistently enriched in ~(13)C relative to plant litter. In the present study, we report data from two laboratory experiments investigating both fungi-collembolans and litter-fungi-collembolans systems. In the fungi-collembolans system, △~(15)N and △~(13)C averaged 1.4± 0.1 and 1.0 ± 0.2 ‰, respectively. In microcosms with fungi-inoculated litter, the difference in δ ~(15) N between collembolans and plant litter averaged 1.5± 0.2 ‰, confirming the relatively small ~(15)N/~(14)N trophic fractionation at the basal level of detrital food-webs reported in numerous field studies. In full agreement with field observations, the difference in δ~(13)C between bulk litter and collembolans in laboratory microcosms averaged 3.6 ± 0.1 ‰ and only little depended on collembolan species identities or the presence of water-soluble compounds in the litter. We conclude that increased δ~(13)C values typical of litter-dwelling decomposers are largely determined by an increased ~(13)C content in saprotrophic microorganisms.
机译:在稳定的实验室条件下正确估算营养分馏因子(△〜(15)N和△〜(13)C)对于稳定同位素分析在土壤群落营养结构研究中的应用至关重要。实验室实验通常表明〜(15)N /〜(14)N大和小〜(13)C /〜(12)C营养级分,但在野外研究中,居住在垃圾产地的节肢动物和其他无脊椎动物始终富含〜(13) C相对于植物凋落物。在本研究中,我们报告了两个研究真菌-collembolans和凋落物-真菌-collembolans系统的实验数据。在真菌-弹状体系统中,△〜(15)N和△〜(13)C分别平均为1.4±0.1和1.0±0.2‰。在接种了真菌的凋落物的微观世界中,血栓虫和植物凋落物之间的δ〜(15)N差异平均为1.5±0.2‰,证实了在基础水平上〜(15)N /〜(14)N营养级分相对较小。许多实地研究都报道了碎屑食物网。与实地观察完全一致,实验室微观世界中散装垃圾和collembolans之间的δ〜(13)C差异平均为3.6±0.1‰,而很少取决于collembolan种身份或垃圾中是否存在水溶性化合物。我们得出的结论是,垃圾处理分解物的典型δ〜(13)C值增加很大程度上由腐养微生物中〜(13)C含量增加决定。

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