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首页> 外文期刊>Geomorphology >Measuring medium-term sheet erosion in gullies from trees: A case study using dendrogeomorphological analysis of exposed pine roots in central Iberia
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Measuring medium-term sheet erosion in gullies from trees: A case study using dendrogeomorphological analysis of exposed pine roots in central Iberia

机译：测量树木沟中的中期表层侵蚀：以树突状地貌分析为例，研究伊比利亚中部裸露的松树根

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摘要

The assessment of gully erosion poses a great challenge because of the complexity and connectivity of the geomorphic processes involved. This study focuses on the quantification of sheet erosion rates in a set of slope gullies located on the northern piedmont of the Guadarrama Mountains (Spanish Central System). In order to delineate accurately the gully areas in which sheet erosion was predominant, the Hydrologic/Erosion Response Unit (HRU/ERU) approach was used and a dendrogeomorphological analysis of exposed tree roots was carried out to quantify sheet erosion rates in one selected HRU/ERU. Identification of the first year of exposure by erosion from anatomical criteria was therefore critical. The 29 samples taken were prepared for anatomical analysis and cross-dated. Anatomical analysis of the samples showed a reduction in the lumen area of earlywood tracheids following root exposure and also, in most cases, a slight increase in growth rings. Moreover, at the end of the ring, latewood tissue and visible annual borders were very clearly defined by several rows of thick-walled tracheids. A non-parametric test was used on the findings derived from this qualitative analysis to objectify determination of the first year of exposure. Estimates of sheet erosion were obtained by dividing the height of eroded soil by the number of years that each root was exposed. The mean value of soil erosion for the entire study site was then determined from statistical inference. Using this procedure, a range of sheet erosion rates between 6.2 and 8.8 mm y~(-1) (125.2 and 177.8 tha~(-1) year~(-1)) was obtained for the dominant HRU/ERU of these gullies in central Iberia. These estimates of eroded soil thickness were adjusted based on the recent finding that root anatomical changes occur prior to their exposure by erosion.
机译：由于涉及的地貌过程的复杂性和连通性，对沟壑侵蚀的评估提出了巨大的挑战。这项研究的重点是对位于瓜达拉马山脉（西班牙中央系统）北部山麓上的一组坡沟中的薄板侵蚀速率进行量化。为了准确描绘出主要发生片层侵蚀的沟壑区域，使用了水文/侵蚀响应单位（HRU / ERU）方法，并对裸露的树根进行了树状地貌分析，以量化一种选定的HRU / ERU。因此，从解剖学标准中识别出第一年的侵蚀暴露至关重要。准备采集的29个样品进行解剖分析并过时。样品的解剖学分析显示，根部暴露后早材气管的管腔面积减少，而且在大多数情况下，年轮略有增加。此外，在圆环的末端，几行厚壁的气管非常清楚地定义了晚材组织和可见的年度边界。对从该定性分析得出的结果进行非参数检验，以客观确定暴露的第一年。通过将侵蚀土壤的高度除以每根暴露的年限，可以得出薄层侵蚀的估算值。然后根据统计推断确定整个研究地点的土壤侵蚀平均值。使用此程序，对于这些沟壑的主要HRU / ERU，获得了6.2至8.8 mm y〜（-1）（125.2至177.8 tha〜（-1）年〜（-1））的薄板侵蚀速率范围。中部伊比利亚。根据最近的发现调整了对侵蚀土壤厚度的估计，发现根部解剖变化发生在被侵蚀暴露之前。

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  • 来源
    《Geomorphology》 |2011年第4期|p.417-425|共9页
  • 作者

    J.M. Bodoque; A. Lucia; J.A. Ballesteros; J.F. Martin-Duque; Juan M. Rubiales; M. Genova;

  • 作者单位

    Mining and Geological Engineering Department, University of Castilla La Mancha, Campus Fabrica de Armas, Avda. Carlos III, Toledo E-5071, Spain;

    Department of Geodynamics and Institute of Geosciences (CSIC-UCM), Complutense University of Madrid, Ciudad Universitaria, C/ Jose Antonio Novais No 2, Madrid E-28040, Spain;

    Department of Research and Geoscientific Prospective, Geological Survey of Spain (IGME), Rios Rosas 23, Madrid E-28003, Spain;

    Department of Geodynamics and Institute of Geosciences (CSIC-UCM), Complutense University of Madrid, Ciudad Universitaria, C/ Jose Antonio Novais No 2, Madrid E-28040, Spain;

    Departamento de Silvopascicultura. Escuela de Ingenieria Forestal y del Media Natural, Universidad Politecnica de Madrid, 28040 Madrid, Spain;

    Department of Plant Production, Botany and Plant Protection, Technical University of Madrid, Ciudad Universitaria s. 28040, Madrid, Spain;

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  • 正文语种 eng
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  • 关键词

    hydrologic/erosion response units; dendrogeomorphology; sheet wash/erosion; wood anatomy; pinus pinaster ait.; spanish central system;

    机译：水文/侵蚀响应单位;树状地貌片洗/侵蚀;木材解剖松皮纳斯特ait。西班牙中央体制;

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