Leaf retention in streams of the Agüera basin (northern Spain)
Leaf retention in streams of the Agüera basin (northern Spain)
复制标题
阿圭拉盆地（西班牙北部）溪流中的树叶滞留
DOI：
10.1007/s00027-003-0623-3
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发表时间：
2003
期刊：
影响因子：
2.4
通讯作者：
J. Pozo
中科院分区：
文献类型：
--
作者：
Santiago Larrañaga;J. Díez;A. Elosegi;J. Pozo
在21个河段的Agüera盆地（北方西班牙），在不同的排放量，使用塑料条叶类似物的能力，以保留落叶（滞留）的流通道。条带针对该地区发生的七种当地叶物种进行了校准。保留是最高的桤木，其次是塑料带，橡木，山毛榉，板栗，桉树，榛，和西卡莫尔。种间保留差异很大，并没有明确的叶的形状或大小。这一结果表明，大量的谨慎是必要的比较结果，作者使用不同的叶种。阿圭拉河的河道具有很强的滞留性，特别是在源头。在基流中，一级河段的条带平均移动距离为3.6 m，三级河流的条带平均移动距离为16.6 m。旅行距离的条增加了两倍，在第三和第二阶河段和5倍，在第一阶流期间的高排放。叶凋落物滞留有关的通道梯度，宽度，和基板。鹅卵石和木材表现出较高的保留效率，和木材作为保留因子的作用在高放电增加。保持性提高了森林溪流中有机物质的储存和随后的利用，因此在管理溪流时应予以考虑。
The capacity of stream channels to retain leaf litter (retentiveness) was measured in 21 reaches of the Agüera basin (northern Spain) at different discharges, using plastic strips as leaf analogs. Strips were calibrated against seven local leaf species occurring in the area. Retention was highest for alder, followed by plastic strips, oak, beech, chestnut, eucalyptus, hazel, and sycamore. Inter-specific differences in retention were great, and not clearly related to leaf form or size. This result shows that a great deal of caution is necessary to compare results obtained by authors using different leaf species. The Agüera stream channels were highly retentive, especially in the headwaters. At baseflows, the average travel distance of strips was 3.6 m in 1st-order reaches, increasing to 16.6 m in 3rd-order streams. Travel distances of strips increased twofold in 3rd- and 2nd-order reaches and 5-fold in 1st-order streams during periods of high discharge. Leaf litter retentiveness was related to channel gradient, width, and substrate. Cobbles and wood showed high retention efficiencies, and the role of wood as a retention factor increased at high discharges. Retentiveness enhances storage and subsequent utilization of organic materials in forested streams, and thus should be taken into account when managing streams.