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首页> 外文期刊>Plant and Soil >Ability of seedling roots of Lolium perenne L. to penetrate soil from artificial biopores is modified by soil bulk density, biopore angle and biopore relief.
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Ability of seedling roots of Lolium perenne L. to penetrate soil from artificial biopores is modified by soil bulk density, biopore angle and biopore relief.

机译：黑麦草的幼苗根部从人工生物孔渗入土壤的能力因土壤容重，生物孔角度和生物孔释放而改变。

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To predict root growth in heterogeneous soil, we need to understand when roots will grow into, along and out from continuous biopores. In this study we determined the effect of biopore angle and wall roughness on root penetration into surrounding soil of different bulk densities. Straight 'artificial biopores', 3-mm diameter and 34-mm long, were formed without radial compression in soil compacted to bulk densities of 1.25, 1.38 or 1.50 Mg m-3. Biopores were inclined at 40 degrees or 90 degrees from the horizontal and their walls scarified or left smooth. Seminal roots of ryegrass (Lolium perenne) were grown for 7 days in the biopores and their penetration of the surrounding soil examined. Few roots (13%) penetrated soil from vertical biopores while most roots (78%) in 40 degrees -from-horizontal biopores grew for only short distances (4-24 mm) before penetrating soil. As soil bulk density increased, the length of roots remaining in 40 degrees -from-horizontal biopores increased, although scarification modified this effect by decreasing the distances roots grew before penetrating soil. Compared with smooth artificial biopores, micrographs of soil surfaces excavated by earthworms (Aporrectodea rosea) showed they were relatively uneven. This study provides a basis for developing simulation models of root growth in heterogeneous soil containing biopores..
机译：要预测异质土壤中的根系生长，我们需要了解根系何时会长出，从连续生物孔中长出或从中长出。在这项研究中，我们确定了生物孔隙角度和壁面粗糙度对根系渗透到不同容重的周围土壤的影响。在压实至堆积密度为1.25、1.38或1.50 Mg m-3的土壤中，形成了直径3毫米，长34毫米的直的“人造生物孔”，没有径向压缩。生物孔相对于水平面倾斜40度或90度，其壁被弄皱或保持光滑。黑麦草（黑麦草）的生根在生物孔中生长了7天，并检查了它们在周围土壤中的渗透情况。很少的根系（13％）从垂直生物孔渗入土壤，而大多数根系（78％）在与水平面成水平的生物孔中仅在短距离（4-24 mm）内穿透土壤。随着土壤容重的增加，与水平生物孔成40度的根部保留的长度也增加了，尽管疏松通过减小根部在土壤中的生长距离而改变了这种效应。与光滑的人造生物孔相比，by（Aporrectodea rosea）挖掘的土壤表面显微照片显示它们相对不平坦。该研究为开发含生物孔的异质土壤中根系生长的模拟模型提供了基础。

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