Spatial variations in the molecular diversity of dissolved organic matter in water moving through a boreal forest in eastern Finland.
Spatial variations in the molecular diversity of dissolved organic matter in water moving through a boreal forest in eastern Finland.
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DOI：
10.1038/srep42102
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发表时间：
2017-02-10
影响因子：
4.6
通讯作者：
Finér L
中科院分区：
文献类型：
--
作者：
Ide J;Ohashi M;Takahashi K;Sugiyama Y;Piirainen S;Kortelainen P;Fujitake N;Yamase K;Ohte N;Moritani M;Hara M;Finér L
溶解有机物(DOM)强烈影响着北方森林生态系统的水质。然而，DOM本身的质量如何在空间上发生变化还不是很清楚。在这项研究中，为了研究通过北方森林的水中DOM分子的多样性是如何变化的，使用傅立叶变换离子回旋共振质谱仪(FT-ICR MS)测定了2010年5-6月芬兰东部挪威云杉和樟子松林不同水样中DOM分子的数量，即雨水、穿透雨、土壤水、地下水和溪水。FT-ICR MS(分子多样性)鉴定的分子化合物数量从865个到2,194个，揭示了水样中大量的DOM分子多样性。此外，一些分子化合物在不同的水样之间是共享的。DOM分子多样性与低生物降解性分子(如木质素)的数量呈线性相关，但与溶解有机碳浓度无关。不同采样点之间共享的木质素数量比任何其他生物分子类别的数量都要多。我们的结果表明，低生物降解性分子，特别是木质素，调节着北方森林DOM分子多样性的空间变异。
Dissolved organic matter (DOM) strongly affects water quality within boreal forest ecosystems. However, how the quality of DOM itself changes spatially is not well understood. In this study, to examine how the diversity of DOM molecules varies in water moving through a boreal forest, the number of DOM molecules in different water samples, i.e., rainwater, throughfall, soil water, groundwater, and stream water was determined using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) in Norway spruce and Scots pine stands in eastern Finland during May and June 2010. The number of molecular compounds identified by FT-ICR MS (molecular diversity) ranged from 865 to 2,194, revealing large DOM molecular diversity in the water samples. Additionally, some of the molecular compounds were shared between different water samples. The DOM molecular diversity linearly correlated with the number of low-biodegradable molecules, such as, lignin-like molecules (lignins), but not with dissolved organic carbon concentration. The number of lignins shared between different sampling locations was larger than that of any other biomolecular class. Our results suggest that low-biodegradable molecules, especially lignins, regulate spatial variations in DOM molecular diversity in boreal forests.