Comparing Macropore Exploration by Faba Bean, Wheat, Barley and Oilseed Rape Roots Using In Situ Endoscopy
Comparing Macropore Exploration by Faba Bean, Wheat, Barley and Oilseed Rape Roots Using In Situ Endoscopy
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利用原位内窥镜比较咖啡豆、小麦、大麦和油菜根部的大孔隙探索情况
DOI：
10.1007/s42729-019-00069-0
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发表时间：
2019-09-01
影响因子：
3.9
通讯作者：
Koepke, Ulrich
中科院分区：
文献类型：
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作者：
Athmann, Miriam;Sondermann, Jana;Koepke, Ulrich
底土中的大尺寸生物孔隙可以提供快速进入深层土壤的途径，并有可能提高养分的获取。除立地条件外，这些影响的程度取决于作物的根系结构。本研究的目的是比较大麦（Hordeum vulgare L.），小麦（Triticum aestivum L.），油菜（Brassica napus L.）和蚕豆（Vicia faba L.）大孔进入时间、根土接触时间和根毛形成时间。农作物种植在具有浓缩底土和人工大孔的柱中。根生长动态监测大孔原位内窥镜。收获后，定量大孔中的根的份额。油菜具有许多垂直根，根毛与孔壁接触，是唯一在大孔中优先生长的作物。禾本科植物的根大多水平穿过气孔，部分带根毛，部分与孔壁接触。几乎所有的蚕豆根都穿过孔隙，没有根-土接触。我们的研究结果支持的概念，生物孔隙对作物根系生长和资源获取的重要性取决于根构型。在供水充足、渗透阻力相对较低的研究条件下，谷物和蚕豆仅少量使用大孔。油菜根系对机械阻抗的敏感性更高，孔隙利用率更高。
Large-sized biopores in the subsoil can provide rapid access to deeper soil layers and potentially enhance nutrient acquisition. Besides site conditions, the extent of these effects depends on crop root architecture. The aim of this study was to compare barley (Hordeum vulgare L.), wheat (Triticum aestivum L.), oilseed rape (Brassica napus L.) and faba bean (Vicia faba L.) with respect to time of macropore entry, root soil contact and root hair formation. Crops were grown in columns with condensed subsoil and an artificial macropore. Root growth dynamics in the macropore were monitored with in situ endoscopy. After harvest, the share of roots in macropores was quantified. Oilseed rape had many vertical roots with root hairs contacting the pore wall and was the only crop with preferential root growth in macropores. Cereal roots were mostly crossing the pore horizontally, partially with root hairs and partially contacting the pore wall. Nearly all faba bean roots were crossing the pore without root-soil contact. Our results support the notion that the importance of biopores for crop root growth and resource acquisition depends on root architecture. Under the conditions of the study with sufficient water supply and therefore comparatively low penetration resistance, macropores were only marginally used by cereals and faba bean. Oilseed rape roots were apparently much more sensitive to mechanical impedance, and the pores were used more intensively.