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Drivers of variability in large wood loads along the fluvial continuum of a Mediterranean intermittent river
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-04-26 , DOI: 10.1002/esp.4865 Tomáš Galia 1 , Tereza Macurová 1 , Leonidas Vardakas 2 , Václav Škarpich 1 , Tereza Matušková 1 , Eleni Kalogianni 2
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-04-26 , DOI: 10.1002/esp.4865 Tomáš Galia 1 , Tereza Macurová 1 , Leonidas Vardakas 2 , Václav Škarpich 1 , Tereza Matušková 1 , Eleni Kalogianni 2
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Although in‐channel and floodplain large wood (LW) has been recognized as an important component of lotic ecosystems, there is still limited knowledge on the recruitment, mobility and retention of LW in rivers with an intermittent hydrological regime. In this study, we analysed the LW characteristics and related reach‐scale variables of 22 reaches in a Mediterranean intermittent river (Evrotas, Greece) in order to identify predictors of in‐channel and floodplain LW distribution. Our results indicated high downstream variation in LW volumes in the fluvial corridor (0.05–25.51 m3/ha for in‐channel LW and 0–30.88 m3/ha for floodplain LW). In‐channel and floodplain LW retention was primarily driven by the hydrological regime of the studied reaches (i.e. perennial or non‐perennial) with higher volumes of LW observed in perennial sections. The width of the riparian corridor was an important predictor of LW storage at the reach scale. Non‐perennial reaches had a disproportionally larger number of relatively small‐diameter living trees at the expense of mature trees with larger diameters typical for riparian stands functioning as LW recruitment areas in perennial reaches. The smaller dimensions of in‐channel LW in non‐perennial reaches, coupled with the dominance of loose LW pieces, implies frequent LW transport during ordinary flood events. Nevertheless, overall low LW retention in the fluvial corridor under non‐perennial flow regime predicts low volumes of mobilized LW. In contrast, the recruitment of relatively long and large‐diameter LW from mature riparian stands in perennial reaches, together with additional LW stabilization by banks, bed sediments, living trees or other LW pieces decreases the potential for further LW transport. © 2020 John Wiley & Sons, Ltd.
中文翻译：
沿地中海断断续续河流的河流连续体上的大量木材负载变化的驱动力
尽管河道内和洪泛区大木材（LW）被认为是抽水生态系统的重要组成部分，但在水文状况断断续续的河流中，有关LW的募集，迁移和保留的知识仍然有限。在本研究中，我们分析了地中海间歇性河流（Evrotas，希腊）中22条河段的水流特征和相关的水位尺度变量，以便确定河道内和洪泛区水流分布的预测因子。我们的结果表明，河道内下游水体的下游变化很大（河道内水体为0.05–25.51 m 3 / ha，河道内水体为0–30.88 m 3/ ha（对于洪泛区LW）。河道内和洪泛区的LW保留主要由所研究河段（即多年生或非多年生）的水文状况驱动，在多年生部分中观察到更大的LW量。河岸走廊的宽度是重要的LW储存量预测指标。非多年生河段的相对较小直径的活树数量不成比例地增加，但以河岸林分典型的直径较大的成熟树为代价，这些河岸在多年生河段起LW募集区的作用。在非多年生河段，河道内LW的尺寸较小，再加上散落的LW碎片占主导地位，这意味着在普通洪水事件中频繁进行LW运输。不过，在非多年生流域下，河流走廊中总体LW滞留量较低，这预示了动员的LW量较低。相比之下，多年生期从成熟的河岸林区招募相对较长和较大直径的LW，再加上河岸，河床沉积物，活树或其他LW碎片对LW的稳定作用，则降低了进一步运输LW的可能性。分级为4 +©2020 John Wiley＆Sons，Ltd.
更新日期：2020-04-26
中文翻译：
沿地中海断断续续河流的河流连续体上的大量木材负载变化的驱动力
尽管河道内和洪泛区大木材（LW）被认为是抽水生态系统的重要组成部分，但在水文状况断断续续的河流中，有关LW的募集，迁移和保留的知识仍然有限。在本研究中，我们分析了地中海间歇性河流（Evrotas，希腊）中22条河段的水流特征和相关的水位尺度变量，以便确定河道内和洪泛区水流分布的预测因子。我们的结果表明，河道内下游水体的下游变化很大（河道内水体为0.05–25.51 m 3 / ha，河道内水体为0–30.88 m 3/ ha（对于洪泛区LW）。河道内和洪泛区的LW保留主要由所研究河段（即多年生或非多年生）的水文状况驱动，在多年生部分中观察到更大的LW量。河岸走廊的宽度是重要的LW储存量预测指标。非多年生河段的相对较小直径的活树数量不成比例地增加，但以河岸林分典型的直径较大的成熟树为代价，这些河岸在多年生河段起LW募集区的作用。在非多年生河段，河道内LW的尺寸较小，再加上散落的LW碎片占主导地位，这意味着在普通洪水事件中频繁进行LW运输。不过，在非多年生流域下，河流走廊中总体LW滞留量较低，这预示了动员的LW量较低。相比之下，多年生期从成熟的河岸林区招募相对较长和较大直径的LW，再加上河岸，河床沉积物，活树或其他LW碎片对LW的稳定作用，则降低了进一步运输LW的可能性。分级为4 +©2020 John Wiley＆Sons，Ltd.
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