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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Physical environmental controls on riparian root profiles associated with black poplar (Populus nigra L.) along the Tagliamento River, Italy
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Physical environmental controls on riparian root profiles associated with black poplar (Populus nigra L.) along the Tagliamento River, Italy

机译：与意大利标签河的黑杨（Populus nigra L.）相关的河岸根谱的物理环境控制

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摘要

Tree roots contribute to the resistance of riparian sediments to physical deformation and disintegration. Understanding reinforcement by roots requires information on root distributions within riparian soils and sediments. Continuous-depth models or curves have been proposed to describe vertical root density variations, providing useful indicators of the types of function that may be appropriate to riparian trees, but have generally been estimated for terrestrial species or broad vegetation types rather than riparian species or environments. We investigated vertical distributions of roots >0.1mm diameter of a single riparian tree species (Populus nigra L.) along the middle reaches of a single river (Tagliamento River, Italy), where Populus nigra dominates the riparian woodland. Root density (hundreds m(-2)) and root area ratio (RAR in cm(2) m(-2)) were measured within 10cm depth increments of 24 excavated bank profiles across nine sites. Sediment samples, extracted from distinct strata within the profiles, were analysed for moisture content, organic matter content and particle size. Statistical analyses identified two groups of wetter and drier profiles and five sediment types. Following log(e)-transformation of root density and RAR, linear regression analysis explored their variation with depth and, using dummy variables, any additional influence of moisture and sediment type. Significant linear regression relationships were estimated between both root density and RAR and depth which explained only 15% and 8% of the variance in the data. Incorporating moisture and then sediment characteristics into the analysis increased the variance explained in root density to 29% and 36% and in RAR to 14% and 26%. We conclude that riparian tree root density and RAR are highly spatially variable and are poorly explained by depth alone. Complex riparian sedimentary structures and moisture conditions are important influences on root distributions and so need to be incorporated into assessments of the contribution of roots to river bank reinforcement. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：树根有助于河流沉积物对物理变形和崩解的抵抗力。根源的理解强化需要关于河岸土壤和沉积物内的根部分布的信息。已经提出了连续深度模型或曲线来描述垂直根密度变化，提供可能适用于河岸树的功能类型的有用指标，但通常估计陆地物种或广泛的植被类型而不是初始物种或环境。我们调查了沿着单一河流（Tagliamento River，Italy）中游的单一河岸树种（Populus Nigra L.）的垂直分布> 0.1mm直径的单个河岸树种（Populus nigra L.），杨树林地占据了河岸林地。在九个站点的24个挖掘的银行型材的10cm深度增量的10cm深度增量内测量根密度（数百m（-2））和根面积比（在cm（2）m（-2））内。分析从曲线内不同地层中提取的沉积物样品，用于水分含量，有机物质含量和粒度。统计分析确定了两组湿式和干燥器型材和五种沉积物类型。以下Log（e） - 根密度和RAR的转换，线性回归分析探索了它们的深度变化，并使用虚拟变量，水分和沉积物类型的任何额外影响。在根密度和RAR和深度之间估计了显着的线性回归关系，其仅解释了数据中的差异的15％和8％。将水分掺入，然后将沉积物特征纳入分析增加了根本密度解释的方差为29％和36％，RAR为14％和26％。我们得出结论，河岸树根密度和RAR是高度空间可变的，并且单独深度解释。复杂的河岸沉积结构和水分条件是对根本分布的重要影响，因此需要将根源贡献纳入河岸加固的评估。版权所有（c）2016 John Wiley＆Sons，Ltd。

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