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On the controls of preferential flow in soils of different hillslope position and lithological origin
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-08-13 , DOI: 10.1002/hyp.13883 Qicheng Tang 1 , Jonathan M. Duncan 1 , Li Guo 1 , Henry Lin 1 , Dacheng Xiao 2 , David M. Eissenstat 1
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-08-13 , DOI: 10.1002/hyp.13883 Qicheng Tang 1 , Jonathan M. Duncan 1 , Li Guo 1 , Henry Lin 1 , Dacheng Xiao 2 , David M. Eissenstat 1
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Soils derived from different lithologies and their controls on preferential flow remain underexplored in forested landscapes. In the same lithology, the propensity for preferential flow occurrence at different hillslope positions also remains largely elusive. By utilizing a soil moisture response time method, we compared preferential flow occurrence between a shale site (Shale Hills, silt loam soils) and a sandstone site (Garner Run, sandy loam soils) at four hillslope positions: ridge‐top, North‐ and South‐facing mid‐slopes and toe slope, for over 2 years. The catchments are neighbouring and covered by temperate forest. For the four hillslope positions, Shale Hills had higher preferential flow frequencies compared to Garner Run. Between these two catchments, the South‐facing mid‐slope sites showed the highest contrasts in preferential flow frequency (33.5% of events at Shale Hills vs. 8.8% at Garner Run) while the ridge‐top sites showed the lowest contrasts (18.7 vs. 13.2%). Additionally, over the unfrozen period, for seven out of eight monitoring sites, drier antecedent conditions tended to be more favourable for preferential flows to occur, with significant (p < .01) relationships at two sites. Except for the South‐facing mid‐slope sites, both Shale Hills and Garner Run had two preferential flow pathways. The characteristic preferential flow pathways at Shale Hills were the Bw and C horizons, and for Garner Run, preferential flow moved from the E/AE horizon to the Bw horizon. This study shows that shale‐derived soils tended to have higher preferential flow occurrence than sandstone soils, but hillslope positions exhibit different levels of contrasts. More effort should be paid to study the impact of lithology on preferential flows in the context of land surface modelling and biogeochemical reactions to improve ecosystem services of headwater catchments.
中文翻译：
不同坡度和岩性成因土壤优先流的控制
在森林景观中，来自不同岩性的土壤及其对优先流动的控制仍未得到充分开发。在相同的岩性中，在不同的山坡位置优先发生流动的倾向也仍然难以捉摸。通过利用土壤水分响应时间方法，我们比较了在四个山坡位置（山脊顶部，北向和北向）的页岩站点（页岩山，粉质壤土）和砂岩站点（加纳尔润，砂壤土）之间优先流动的发生。朝南的中坡和趾坡，已有2年以上。这些流域是相邻的，被温带森林覆盖。与Garner Run相比，对于四个山坡位置，页岩山具有更高的优先流动频率。在这两个流域之间 朝南的中坡站点在优先流频方面显示出最高的对比度（页岩山事件占33.5％，Garner Run事件占8.8％），而山脊顶部站点的对比度最低（18.7对13.2％）。此外，在非冻结期间，对于八个监视站点中的七个监视站点，更早的条件往往更有利于优先流的发生，其中显着（p <.01）在两个地点的关系。除了朝南的中坡地带外，页岩山和加纳河道都有两条优先流动通道。在页岩山的特性优先流动通路是在乙瓦特和C的视野，以及加纳运行，优先流从E / AE地平线到B移动瓦特地平线。这项研究表明，与砂岩土壤相比，来自页岩的土壤倾向于发生优先流动，但是山坡位置表现出不同的对比水平。在陆地表面模拟和生物地球化学反应的背景下，应加大努力研究岩性对优先流动的影响，以改善源头流域的生态系统服务。
更新日期：2020-10-06
中文翻译：
不同坡度和岩性成因土壤优先流的控制
在森林景观中，来自不同岩性的土壤及其对优先流动的控制仍未得到充分开发。在相同的岩性中，在不同的山坡位置优先发生流动的倾向也仍然难以捉摸。通过利用土壤水分响应时间方法，我们比较了在四个山坡位置（山脊顶部，北向和北向）的页岩站点（页岩山，粉质壤土）和砂岩站点（加纳尔润，砂壤土）之间优先流动的发生。朝南的中坡和趾坡，已有2年以上。这些流域是相邻的，被温带森林覆盖。与Garner Run相比，对于四个山坡位置，页岩山具有更高的优先流动频率。在这两个流域之间 朝南的中坡站点在优先流频方面显示出最高的对比度（页岩山事件占33.5％，Garner Run事件占8.8％），而山脊顶部站点的对比度最低（18.7对13.2％）。此外，在非冻结期间，对于八个监视站点中的七个监视站点，更早的条件往往更有利于优先流的发生，其中显着（p <.01）在两个地点的关系。除了朝南的中坡地带外，页岩山和加纳河道都有两条优先流动通道。在页岩山的特性优先流动通路是在乙瓦特和C的视野，以及加纳运行，优先流从E / AE地平线到B移动瓦特地平线。这项研究表明，与砂岩土壤相比，来自页岩的土壤倾向于发生优先流动，但是山坡位置表现出不同的对比水平。在陆地表面模拟和生物地球化学反应的背景下，应加大努力研究岩性对优先流动的影响，以改善源头流域的生态系统服务。
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