Early degradation of plant alkanes in soils: A litterbag experiment using 13C-labelled leaves
Early degradation of plant alkanes in soils: A litterbag experiment using 13C-labelled leaves
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DOI：
10.1016/j.soilbio.2011.07.009
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发表时间：
2011-11
影响因子：
9.7
通讯作者：
T. Tu;Céline Egasse;B. Zeller;G. Bardoux;P. Biron;Jean-François Ponge;B. David;S. Derenne
中科院分区：
文献类型：
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作者：
T. Tu;Céline Egasse;B. Zeller;G. Bardoux;P. Biron;Jean-François Ponge;B. David;S. Derenne
利用欧洲山毛榉（Fagus sylvatica L.）的13c标记叶片和未标记对照叶片，进行了为期4年的垃圾袋实验，监测了散装叶片和特定长链烷烃的碳同位素组成。13c富集叶片的烷烃同位素组成显著降低，而未标记对照叶片的烷烃同位素组成基本保持不变。我们将这种差异解释为微生物对分解叶片的长链烷烃库的贡献的证据，并将其与土壤生物对叶片的逐步入侵联系起来，这是在显微镜下观察到的。这些结果表明，长链烷烃可能不能提供土壤和沉积物中有机碳同位素组成的不变记录。
We monitored the carbon isotope composition of bulk leaves and specific long-chain alkanes during a four-year litterbag experiment using13C-labelled leaves and unlabelled reference leaves of the European beech tree (Fagus sylvatica L.). Whereas the isotope composition of alkanes from13C-enriched leaves exhibited a marked decrease in13C-content, the isotope composition of unlabelled reference leaves remained nearly constant. We interpreted this difference as evidence for a microbial contribution to the long-chain alkane pool of the decomposing leaves and related it to the progressive invasion of leaves by soil organisms which was revealed upon microscopic examination. These results suggest that long-chain alkanes may not provide an unaltered record of organic carbon isotope composition in soils and sediments.