Using dye tracer for visualizing roots impact on soil structure and soil porous system
Using dye tracer for visualizing roots impact on soil structure and soil porous system
复制标题
使用染料示踪剂可视化根系对土壤结构和土壤多孔系统的影响
作者：
R. Kodešová;K. Němeček;A. Žigová;Antonín Nikodem;Miroslav Fér
摘要植物通过吸收水分和水分在土壤表面的不均匀分布来影响土壤水分状况。后一个过程的研究较少，但众所周知，根系通过增加聚集和生物孔的产生来改变土壤结构。本研究利用染料示踪剂，以可视化的影响，植物对水分流动的表层土壤的灰色黑土。在冬小麦收获后，在田间1m × 1m的框架内，将亮蓝积水至10cm高。完全浸润后，染色模式内的垂直和水平领域规模的部分进行了研究。此外，通过制作土壤薄片，利用微形态图像研究了微尺度下的土壤结构和染料分布。田间规模的部分清楚地记录了不均匀的染料渗透到土壤表面，这是受植物的存在，在某些情况下，由土壤表面的机械压实。微形态图像显示，根系活动压缩土壤，增加根系附近的容重（这也可能是根系吸水和土壤粘附的结果）。另一方面，在少数情况下，观察到优先流沿着的根。
Abstract Plants influence the water regime in soil by both water uptake and an uneven distribution of water infiltration at the soil surface. The latter process is more poorly studied, but it is well known that roots modify soil structure by enhancing aggregation and biopore production. This study used a dye tracer to visualize the impact of plants on water flow in the topsoil of a Greyic Phaeozem. Brilliant blue was ponded to 10 cm height in a 1 m × 1 m frame in the field immediately after harvest of winter wheat (Triticum aestivum L.). After complete infiltration, the staining patterns within the vertical and horizontal field-scale sections were studied. In addition, soil thin sections were made and micromorphological images were used to study soil structure and dye distribution at the microscale. The field-scale sections clearly documented uneven dye penetration into the soil surface, which was influenced by plant presence and in some cases by mechanical compaction of the soil surface. The micromorphological images showed that root activities compress soil and increases the bulk density near the roots (which could be also result of root water uptake and consequent soil adhesion). On the other hand in few cases a preferential flow along the roots was observed.