Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests
Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests
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DOI：
10.5194/bg-12-2695-2015
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发表时间：
2014-10
期刊：
影响因子：
4.9
通讯作者：
Sebastian Bischoff;M. Schwarz;J. Siemens;Lisa Thieme;W. Wilcke;B. Michalzik
中科院分区：
文献类型：
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作者：
Sebastian Bischoff;M. Schwarz;J. Siemens;Lisa Thieme;W. Wilcke;B. Michalzik
抽象。我们提出了溶解有机物（DOM）的组成与总有机物（TOM，由DOM组成）相比的第一次调查。来自21个样品的13 C NMR结果表明，在山毛榉站点穿透水溶液中DOM和TOM的组成存在显著差异，TOM表现出烷基C区域的相对强度较高，其表示与DOM相比来自较少分解的有机材料的脂肪族C。此外，TOM显示较低的强度木质素衍生的和芳香族C的芳基C区域导致较低的芳香性指数和腐殖化程度降低。在整个生态系统分区中，榉木下DOM和TOM结构组成的差异按以下顺序减小：穿透雨>树干径流>森林地面渗滤液。与阔叶林相比，云杉穿透雨溶液中DOM和TOM之间的差异不太明显，光谱总体上由烷基C区域（代表脂肪族C）主导。所报告的结果的解释可能在树种特定结构效应的差异、淋溶特性或树种叶圈和皮质圈微生物群落的差异中得到证实。然而，事实上，穿透DOM山毛榉下表现出最高强度的柠檬酸芳香族和酚类C在所有样品分析可能指向一个高的山毛榉树的化感潜力产生负面影响的其他生物，因此生态系统的过程和功能。
Abstract. We present the first investigation of the composition of dissolved organic matter (DOM) compared to total organic matter (TOM, consisting of DOM, The 13C NMR results, derived from 21 samples, point to pronounced differences in the composition of DOM and TOM in throughfall solution at the beech sites, with TOM exhibiting higher relative intensities for the alkyl C region, which represents aliphatic C from less decomposed organic material compared to DOM. Furthermore, TOM shows lower intensities for lignin-derived and aromatic C of the aryl C region resulting in lower aromaticity indices and a diminished degree of humification. Across the ecosystem compartments, differences in the structural composition of DOM and TOM under beech lessened in the following order: throughfall > stemflow ≈ forest floor leachate. In contrast to the broadleaved sites, differences between DOM and TOM in throughfall solution under spruce were less pronounced and spectra were, overall, dominated by the alkyl C region, representing aliphatic C. Explanations of the reported results might be substantiated in differences in tree species-specific structural effects, leaching characteristics or differences in the microbial community of the tree species' phyllosphere and cortisphere. However, the fact that throughfall DOM under beech showed the highest intensities of recalcitrant aromatic and phenolic C among all samples analysed likely points to a high allelopathic potential of beech trees negatively affecting other organisms and hence ecosystem processes and functions.