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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Contribution of dead wood to the carbon flux in forested streams
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Contribution of dead wood to the carbon flux in forested streams

机译：死木对森林溪流中碳通量的贡献

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Dead wood has been identified as an important structural component of stream ecosystems, and researchers have stressed its role in retaining sediments and organic matter, increasing habitat diversity and providing refugia for aquatic organisms. Because it is a highly refractory compound, known to take very long periods to break down underwater, it has been considered a slow source of dissolved or fine particulate organic matter. We evaluated the contribution of dead wood to the total carbon flux in two headwater forested streams in northern Spain, one running under mature deciduous forest, the other under eucalyptus plantations. Breakdown rates were measured from branches (10 cm long, 3 cm in diameter) of alder, oak and eucalyptus, the main species present at the streams, applied to the standing crop of fine dead wood following four different models and compared with the breakdown loss of leaf litter calculated in a previous work for the same reaches. Calculations showed breakdown losses of fine wood (FW, diameter 1-5 cm) to range from 6.0 to 12.3 g ash-free dry mass (AFDM) m(-2) y(-1) at the deciduous stream and from 4.6 to 7.1 g AFDM m(-2) y(-1) at the eucalyptus stream. Conservative assumptions show that fine wood breakdown losses amount to 21% of the mass lost by leaf breakdown at the deciduous stream and to 9% of leaf breakdown at the eucalyptus stream. So, fine dead wood contributes to a significant fraction of the total breakdown of allochthonous organic matter in the studied streams; other sizes of dead wood (twigs, coarse wood) increase the breakdown by an order of magnitude, and thus can result in a large part of the carbon flux being derived from wood. Copyright (c) 2007 John Wiley & Sons, Ltd.
机译：枯木已被确认为河流生态系统的重要结构组成部分，研究人员强调了其在保留沉积物和有机物，增加栖息地多样性以及为水生生物提供庇护方面的作用。由于它是一种高度难熔的化合物，已知需要很长时间才能在水下分解，因此被认为是溶解或细颗粒有机物的缓慢来源。我们评估了西班牙北部两条死水森林溪流中死木对总碳通量的贡献，其中一条流在成熟的落叶林下运行，另一条在桉树人工林下运行。测量了the木，橡树和桉树的树枝（长10厘米，直径3厘米）的分解率，,木，橡树和桉树是溪流中存在的主要树种，按照四种不同模型应用于细硬木的立木上，并与分解损失进行了比较在以前的工作中针对相同范围计算出的枯枝落叶数。计算表明，在落叶流处，细木料（FW，直径1-5厘米）的击穿损失为6.0至12.3 g无灰干重（AFDM）m（-2）y（-1），范围为4.6至7.1 g在桉树流处的AFDM m（-2）y（-1）。保守的假设表明，细木的分解损失占落叶流叶片分解质量损失的21％，而桉木流占叶片分解质量损失的9％。因此，细小的枯木占研究流中异源有机物总分解的很大一部分。其他尺寸的死木（树枝，粗木）会使分解增加一个数量级，因此可能导致很大一部分碳通量来自木材。版权所有（c）2007 John Wiley＆Sons，Ltd.

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